Placing Images - The Image Manager
Related links
In addition to
being able to assign your own multi-media files to stellar and non-stellar
objects (for example, images,
wave files, AVI files, and text files)
TheSky6 has an
image placement tool. The
Data | Image Manager allows TIF images to be embedded on the Virtual Sky. These
image are displayed at appropriate fields of views based on image size.
Note: In TheSky6, thumbnail images are supplied for all NGC/IC
objects including Messier' list, as well as all PGC galaxies that are larger than
about two arcminutes in size, and the PLN planetary nebulae images.
The majority of the embedded
images included with TheSky6 are grayscale high-resolution images created using the
102 CD-ROM set of the Palomar Sky Survey. Color images were subsequently taken from the
Anglo Australian Observatory David Malin collection, and a few from the Hubble
Space Telescope
page. For example, a color image of M51 taken with Hubble
is shown here. <--- Click
here.
The grayscale thumbnail DSS/Palomar Sky Survey images
with a scale of 1.7 arcseconds/pixel
offer very good detail even on smaller objects and/or when zoomed into
reasonably small fields of view.
Example of M51 NGC 5194
imaged
at 1.7 arcseconds/pixel
Nice detail,
TheSky6 DSS thumbnail
image
http://www.stsci.edu/institute/Copyright
To "add" a new image to an object, click
Data | Image Manager, select the appropriate image group, and then click Add New Image. Or you can create a new image group, for example the Barnard group
that I created for the Barnard Dark Nebulae. The following shows how to add a new
image to the IC Pictures group.
Pick Group first then Choose Add New Image
Add Group makes a new Image Group
Image Groups in First Production Run
Note that only two Image Groups are included
Make sure you
have updated TheSky to the latest version.
Data | Image Manager
Add New Image
If the object you are adding an image to has a cross reference like IC 434
for the Horsehead nebula enter it here,
but this is not required. It just helps for centering on the object before
placing the image.
If you choose to you can attempt an Image Link to get the necessary image
scale and position angle for the image. his will make placing the image
much easier since you will be right on to start with. But, this is not
required by any means. The Image Manager
has everything you will need to place any reasonable size image without knowing
much.
HINT: Image Link can provide you the above
image scale and position angle in many cases.
Cropping an Image that is too large when Image Link Fails
If you are having problems getting very large color images to link first convert
them to a grayscale image. Sometimes adjusting the brightness and contrast
so that the stars become very white and clear of the background helps. And, if the full size image is not working try cropping the image to a smaller
size. Crop DO NOT resample. Re-sampling will change image scale
cropping will not.
Note the following from the Image Link
information. By getting a successful image link you have everything you
need to make image placement as simple as possible. After cropping an
image and getting what you need make sure you actually place the full size
image.
Object name: Image Link Information
Equatorial: RA: 05h 41m 09s Dec: -02°31'16"(current)
Equatorial 2000: RA: 05h 40m 50s Dec: -02°31'32"
Horizon: Azim: 94°26'23" Alt: +02°18'10"
Visibility: Rise 00:34, Set 12:25
Transit time: 06:30
Position angle: 00°15'
Hour angle: -05h 42m 25s
Air mass: 17.78
Screen x,y: 623.00, 463.00
Sidereal time: 23:58
Click distance: 500.0000
Scale: 7.6086
Height: 50.2568
Width: 50.2568
The scale of the image and the Position angle
reported by
Image Link
are highlighted above. These values can now be entered directly in the Add New
Image dialog. The 15 arcminute North angle is 15 arcminutes/60
minutes/degree or 0.25 degrees.
Enter what you know about the image
Choose Select Picture File and Close
Choose Select Picture File and Close. Next browse
your computer for the TIFF image file by name. Once the image is "ADDED" to
the group, Expand the group and find the entry listed. Then choose the
Place Image tab. See below.
NOTE: When the scale and north angle are
correctly entered the image should already be aligned just like magic. From here just a changes to image (i.e. moving up and down/left and right) will
refine the position to accurately match TheSky6 display.
In this particular case keep in mind that IC434 is
not centered on the Horsehead. There is a small discrepancy between the
center of the nebula and the Horsehead.
The following values control when and when not to
plot the images on the main TheSky6 display. See the section
Wide field and Narrow Field
Image for details on how/why to use the option.
Example:
If you want the Horsehead nebula image to kick in
at say 30 degrees then be disabled at 2 degrees the following change in the IC
Pictures group text file will take care of that. Just edit the text file
named "IC Pictures.ImgGrp" and make the change to the line with the
Horsehead
IC434.
1|ic434.tif|IC434| 5.678331|-2.209808| 7.600000| 0.000000|642|814| 2.000000|30.000000|
This can also be done at the point of
adding the image. Just enter the Minimum
and Maximum values in the Add New Image dialog
under Field of view visibility
(degrees) as shown above.
The Data | Image Manager command is used to place
embedded images on the Virtual Sky.
NOTE: The Image Groups on your computer will differ slightly from the
following since there is at least one new group that I created (specifically,
the Barnard Image Group).
From the following you can see the images have
been broken up into groups for easier image management. The constellation drawings are also located under
the Constellation Drawings group.
If your Image Groups list the Constellation
Drawings and Non-Stellar Color Pictures groups only, you have media from the
first production run. The first production run included about 113 alpha channel TIFFs. Media from later production runs contain about 260 megabytes of alpha channel
TIFF images.
The new groups include the NGC, IC, Messier, and PGC galaxy pictures.
Image Manager
Image Groups from the first Production run.
Expanding any image group will show the individual
images contained within that group. Below shows the group for the IC
objects expanded.
Image Manager
Double-click to expand the group
Note that individual file names are now shown.
Downloading and Installing the Latest Image Groups
If you received media from the
first production run, and want to obtain the additional Image Groups list above,
you can download and install them from the Software Bisque site.
To download and install the
Image Groups that are included with the second production run:
-
Download the file
NewImageGroups.zip (162 MB).
-
Unzip this file into TheSky6's
Data\Pictures\Image Groups folder. By default, the location of this
folder on your computer is:
\Program Files\Software
Bisque\TheSky6\Data\Pictures\Image Groups
NOTE: After UNZIPPING the
Image Groups and files you will need to ENABLE
the new groups in TheSky using the Display Explorer. The groups did
not exist now they do but the state of the groups is set to off. See below
showing all groups enabled. Also, if TheSky6 is loaded the change will not
take effect until you EXIT then re-launch TheSky6.
Enable any or all of the
groups
Make sure the groups you want are checked!
NOTE: The View | Display Explorer
command can also be used
to enable/disable the individual images under a group. Use View | Display Explorer then
under Image Groups expand the group with the images you want to enable/disable. To disable an entire group remove the check in front of the group name then all
images under the group are disabled.
Early Media fewer groups
Check mark(s) enables
the plotting of the entire group
There is a known bug (currently) regarding Windows
XP Service Pack 2 and Pyramid Alpha Channel TIFFs not displaying. To see if this is the case, use Windows Explorer to
view thumbnails of any Image Group.
Here is the Culprit!
The dreaded Pyramid option
Inadvertently some images not all were saved with
the Pyramid Option in Adobe Photoshop enabled. Service Pack 2 has introduced a
bug where this type of image cannot be displayed. Not even using Windows
Explorer! To date (June 2007) the bug has not been fixed, just ignored.
Windows Explorer - Where have all the images
gone!?
Viewing using thumbnails
If some image(s) do not appear here, then you must
download and install the latest images as described in the above technical
support article. In the above NGC6960 and NGC6979 do not appear using Windows
Explorer because they were saved with the Pyramid option enabled.
To manually fix any image saved with the Pyramid
option enabled load the image into Adobe Photoshop or similar then save the
image with option Image Pyramid disabled. OR
NEW! Single TEST image
download
To evaluate whether or not the new images are in
fact the fix the following link has a single image Gamma Cyg.TIF for download.
Download the above zipped image and UNZIP the TIF
file replacing the existing version. In TheSky use Edit | Find Gamma Cyg and
center on the object.
Edit | Find
Gamma Cyg and Center
4 degree field Zoom out to see
it!
There she is!
Still no photograph shows!
-
Can
you see the photograph using Windows Explorer in thumbnail mode?
-
Do you have the
image group enabled?
-
Do you have a
check mark next to the image?
-
What
happens if you right mouse click inside Gamma Cyg (disable stars first!)?
-
What is your
current field of view?!?
Enable Group
and Image
WARNING. Make certain the Image Group
you are working with is in fact enabled. If there is not a check mark next
to the Group any image under the group will not have the option to plot. Nor will the RIGHT CLICK
toggle work either!
Click View | Display Explorer
then toggle the
GROUP state
Check mark(s) enable the display of the
entire group
but the individual images can still be disabled
Expand a group to see the individual images that
make up the group. Below the individual images can be enabled and disabled. However, if the GROUP is not enabled the images is not available. See below.
Individual photos under the NGC group
Check mark displays photo
No Check mark image doesn't
show
Another way you can disable a placed TIF
photograph is to simply right mouse click on the object. Any where within the
size of the object then choose the option to TOGGLE the photo. If the image is
off it will come on and vice versa! This means if you click on the object with
no photograph displayed you still have the option to toggle the photograph.
Enable or Disable
Toggle photo on or off
If there is no option to toggle the TIF file
either one does not exist for the object or the
GROUP the object is in has been disabled!
The Place Image tab located on the
Image Manager dialog has features to aid in the
image alignment procedure. Unlike Image Link this is a manual method of
image
alignment whereby the goal is to match the image with the main TheSky6 display.
However, you can often times use
Image Link first to help the
manual alignment procedure. For example finding the scale of an unknown
image an the position angle. Although the manual method is more tedious
when compared to
Image Link
it is much more flexible and works with all images since you are in full control of
the image placement. Takes a bit of time to master but becomes fairly easy
in the end.
HINT: You may find you have to convert a color image to a gray
scale BMP image first BEFORE an Image Link
will work. And, if the image is very large (say greater than about
1500 pixels) try cropping the image first. Re-Sampling an image to be smaller will actually alter the scale (meaning less
resolution) so avoid this if possible.
If you wish to "REMOVE" an existing image from a
group and
replace it with one of your own you can either disable the existing by removing
the check mark next to the image
or REMOVE the image first then pick a new file and place it instead. Either way.
There maybe times when you want images for the
color esthetic look and a second image that has more detail and is only
black and white but more complete. Like images for identifying new
potential objects like supernovas or minor planets. So you can have a say
a Black and White group along with a Color Group and use them interchangeably.
Because there is an image already provided of the region around IC434 (the
Horsehead nebula) by default we will start with
this. Under the expanded IC Pictures group in the
Image Manager go down the list and find the entry
for "IC434.TIFF". Once highlighted use the "Place Image" tab
which is highlighted on the dialog
below.
NOTE: If you do not have any individual
groups listed in the Image Manager
Place Image
Click the name of the image to place
or Remove Image from group
Or, just center TheSky6 display on the
Horsehead nebula
(Edit | Find Horsehead) and then right mouse click on the main display on the
nebula and choose the option "Adjust Image
ic434.tif" from the list.
The option "Toggle ic434.tif" will turn on or turn
off the image. If the image is visible Toggle will turn it off and vice a
versa. If the image is not visible right mouse click and choose Toggle and
the image will become visible. This must be clear. The sate of the
image is toggled on or off.
Right Mouse Click
Choose "Adjust Image ic434.TIFF"
Wait I do not see the option to toggle the
image only Toggle Nebula.
If the option to toggle the image does not show
there are two possibilities.
-
There is no image associated with the nebula you are clicking on or
-
The
Image Group with this object is not enabled.
Because the IC434 image has been properly placed,
it is aligned to the Virtual Sky. See image in place below.
Image Manager | Place Image
All aspects for placing the image are here
Nearly all the tools necessary for image alignment
are here up, down, left and right, rotation, aspect ratio and so on. Use
Photoshop to mirror your color images if necessary.
Once in the image placement mode you can press any
of the above buttons on the place image dialog to see the effect it/they have on
the images' position. The image can be rotated, scaled, moved up, down,
left, and right, and so on. Even the aspect ratio of the image can be
altered.
HINT: Use the transparency feature
below to see the changes applied more easily. See example near
transparent image below which is (obviously) not placed correctly.
HINT2: Press the CONTROL key down plus click
on a direction button to make less of a change. This is more convenient
than switching from Course to Fine for example, especially when the image is
very close to being properly placed and it comes in very handy.
When the image is properly placed just press the
"Save" button.
NOTE: The blue border around
the image indicates you are placing the image. You can still use the normal zoom
in and out and move up, down, left, and right, features of TheSky6 in the image
placement mode as well if they are needed.
Following is the saved entry for the above image
IC434 in the IC Pictures Group text file ("IC Pictures.ImgGrp"). The fields of information are created from the image manager
dialog.
1|ic434.tif|ic434| 5.678192|-2.212639| 7.564251| 0.000000|814|642| 0.000000|15.000000|
Specifically the name of the file, the object
it is associated with (not required but handy), the RA and DEC, rotation or
position angle, size of the image, and image scale. These values and
their respective fields are also conveniently displayed on the
Imager Manager dialog when an image has been
highlighted. See below showing the Image Properties.
Click on image
Note image Properties at the bottom of the
dialog
The image can also be REMOVED here
then you can replace it with your own properly placed image if you like.
Now by using the
Transparency slider (moving it to the
right) the color photograph becomes more transparent (that is see-through) often
times helping image placement. It helps to be able to see more of the
stars behind the image when the image in place is covering TheSky's background
stars.
Transparency Slider
Slide to the right to increase the transparency.
See effect on image here
Note image copyright is now showing through.
HINT: If you have the
RealSky data or the full
Palomar Sky
Survey 102 CD's at 80 gigs of data you can use these images to help the
alignment by having TheSky6 create the background image for you first. Of
course yes you can use your own images as well. For those that don't have
the data you can use on-line sources to create images then image link them in
place (scale = 1.7 arcseconds/pixel).
HINT2: Often times RE-SAMPLING an image
makes it easier to work with. Yes the changes the scale so either change
it in the Image Link setup or use an unknown scale. The loss of resolution
by re-sampling to a smaller image will not hurt image placement. This is merely
for a reference. Cropping an image
is another option that can work very well.
NOTE: The current limit to the size of images created using the
RealSky data or Palomar Sky Survey is 2 degrees when using
CCDSoft. Images
larger than this will encounter plate boundaries. However, you can still
use subset fields to help larger image placement effectively. I beleive
this is true for the on-line DSS services as well and most likely for the same
reason.
NOTE: A 2 degree 16 bit FITS image is about
34 megabytes in size. Using the DSS images as a background image for
placement can come in very handy. The scale is 1.7 arcseconds/pixel and
the north angle is very near 0 degrees.
Now image placement using the transparency feature
becomes quite simple. See below where the Horsehead image is no longer
properly placed.
Malin image versus DSS in place image.
Whoops, Houston we have a problem.
Now just shift the image using the
Image Manger until you have a match. Note the stars used as a reference in addition to the nebulosity itself. You will know when you have it.
The following animated GIF may
take time to downloading, especially with slow connections.
Reality check for image placement
http://www.stsci.edu/institute/Copyright
DSS image and AAO
David Malin aligned
(click for copyright info.)
The image type used in this example with the
Image Manager is an
Alpha Channel TIFF. You will need software such as Adobe PhotoShop or
similar in order to create the proper Alpha Channel.
If you choose to use another format like BMP, GIF,
or JPG the image will be displayed as is. That is there will be no
clipping or masking of any kind. This does not work well with the embedded
images although it is fine when adding
multi-media objects that are of type image whether it be .JPG, GIF. PCX,
TIFF, etc. where you are just looking at the images. The solution is to use
an Alpha Channel TIFF.
By using an Alpha channel you can mask
(hide) parts of the image that you don't want to see. Why? Take the
copyright stamp in the example image for "IC434.TIFF". By masking this
part of the image the copyright stamp is simply hidden from view and only what
we want out of the image will show. Cool.
Why use the Alpha Channel? I have found that by
creating a good matching alpha channel TIFF the end result is a better placed
image when compared to the automated process used to provide the
default embedded (thousands of) thumbnail images in grayscale GIF format at
least for a couple hundred objects.
However, trying to make
custom alpha channel TIFFs for every object is simply not feasible, slows the
plotting of the display down, and is not needed really needed for the majority
of the objects. I have taken the time to make custom
Alpha Channel TIFFs for all 110 Messier objects and nearly all of the NGC/IC
objects that are of a size greater than about 15 arcminutes. The
Data Wizard makes finding these
objects by size a simple task. The hard part is then finding or creating
the necessary image and finally making an appropriate Alpha channel (mask) for
the TIFF image. Artistic license? YOU BET.
Back to the example image of IC434. The
following Alpha Channel I created using PhotoShop CS2 will mask off the
Copyright notice for us as well as the other
bright stars from the image we do not want to show. These are then filled
in by TheSky6
stellar data.
The Alpha Channel
Alpha Channel (Mask) created using PhotoShop
CS2
"auto magically"
Here are some tricks I have learned by working
thousands of images. And the end result using the alpha channel speaks for
itself.
Horsehead Nebula TheSky6
Final
copyrighted image in place.
Originally, I generated alpha channels by hand. Many
image distributed TheSky6 were done this way. This was not only very time consuming, but
didn't work well.
Example Image: Keep in mind the images are merely place holders.
For this example I am choosing M104 the Sombrero
galaxy for several reasons which should become clear as I go. The default
black and white DSS thumbnail image for galaxy M104 - NGC 4594 as created in the
automated fashion is here,
Basically the 102 CD's of the
Palomar Sky Survey
data (80 gigs on a hard drive) were crunched through by TheSky6 and
CCDSoft using the data
from the NGC/IC, PGC, and PLN catalogs for the object positions, sizes and
position angles. This method worked extremely well for 90% of the objects
and was the obvious choice for image size, plotting speed, image detail, and to
meet realistic shipping dead-line.
NOTE: The original square image created by
CCDSoft has been clipped in the display using the size of the object from the
dataset. In this example the PGC data
<-- click for complete details for M104's size, position, and
position angle was used, NOT the NGC entry for the object.
Clipping images to catalog size
Ok so far
Now the only real issues here the accuracy of the
data in regard to its' position, size, and the position angle. For the
most part by using the PGC data for galaxies, and the newer updated NGC/IC data
the problem with positional accuracy is not as bad as it used to be.
Now when I first saw the Hubble Space Telescope
equivalent color image STSci 2003-28 I felt it was worth placing and having
available too. Here is that image scaled down.
Now here is how to create the Alpha Channel TIFF
for this image so that it can be placed in TheSky6.
At first I simply used the PhotoShop Lasso Tool to
manually trace out the galaxy. Once traced this became the "New Alpha
Channel" for the TIFF. Crude but effective example below.
Hubble Image with manual attempt
To trace out the galaxy
Choose New Alpha Channel TIFF
Bucket Fill the traced area with white.
Well, that works. However in time I learned
a few techniques that made this process a heck of a lot easier, less time
consuming, more accurate, and yielding a very good end result.
Here is an automated Alpha Channel. First I
used the brightness and contrast option to darken the image. This allowed
me to easily get the bright galaxy out of the background using nothing but the
magic wand tool with the right "tolerance" setting. Basically I had to
find the optimum setting by trial and error, which in this case turned out to be
a tolerance of "15". Different tolerance settings simply yield different
results. These changes take effect immediately when you re-wand the image.
Here is the RGB image magic wanded
using a tolerance of 45
Showing the area that becomes the Alpha Channel
Much better.
Work Smarter not harder ay?
What about the outer laying speckles in the
image?
This is one of the reasons for choosing this
image. I guess this is where the artistic license comes in. There
are a couple of ways to handle this. This speckles can be completely
eliminated easily enough if you choose.
To remove the speckles simply magic wand the areas
to stay first then select the INVERSE (right mouse click on the image in
PhotoShop and choose Inverse) and cut out the background. OR just use a
large eraser and wipe out the area outside the galaxy. As long as the area
to stay is wand'ed you can't erase anything by accident. Works great.
Also, see the feather section below. By
feathering BEFORE you choose the inverse you will have nice smooth edges.
Ok I like that.
What about the bright star with diffraction
spikes?
Same thing. Easy enough to just get rid of
it too while you are at it. In this particular case this is more than
reasonable because there happens to be reasonably accurate star filled in by
TheSky6 which will take its' place. Actually there is one from the USNO-B
subset data and another from the UCAC 2.0 dataset which plot at this position.
What about the rough outer edges?
Again, no problem
"No problem. I just love searching for life forms", Lieutenant Commander
Data STNG.
Another trick I found to smooth out rough edges is to use the Feather option
with a value of about "3". This works REALLY well when you
create the Alpha Channel. Just Right Mouse Click on the image when the
area has been magic wand ed then choose the "Feather" option BEFORE creating the
Alpha Channel for a nice smoothing
effect. The feathering makes for a smooth transition from the foreground
to the background cleaning up the outer edges. The following is a better
image with smoother edges.
Final Alpha Channel (Mask)
M104 Hubble image
Note: The star on the right of the image
was intentionally left in place
meaning it will show through. If it is not desired just erase it and it
will go away.
Final image in place.
Better than the manual method and a lot easier.
If you are searching for supernovae, it may be
best to create your own set of images leaving as many stars in the field in
place as possible for quick identification of known stars. The majority of the
images I have created alpha channels for were carefully created by inspecting
the field against the images first. However, there still maybe certain
images that could be altered specifically for supernovae searchers by leaving in
ALL stars. Or just DISABLE the use of Image
Groups and use the DSS thumbnails only!
If you don't like any or all of the default
images in the alpha channel TIFF form, either disable them, remove them, or
simply replace them with your own images.
Right Mouse Click on the image
Then choose "Toggle IC434.TIFF"
NOTE: You can also go directly to the
Image Manager here by choosing "Adjust
Image ic434.tif" from the menu. This works on all embedded images found in
the image groups (alpha channel TIFFs).
The images can be enabled/disabled quickly and
easily this way. Even if the image is already off and not visible? Yes, right mouse click
on the object again even when the image is off (not visible) and the toggle will bring it back on.
You can also use the Image Manager to
enable and disable the TIFF images associated with the objects in a group as shown
below. Just find the entry(s) in the list and place a check for on or remove the
check to disable plotting the image. And if you really don't like them you can
choose "Remove Image" or just replace the existing image with one of your
own images and disable the default or even disable the whole group(s).
Use the Image Manager
Set the visible state on multiple objects
NOTE: For the grayscale thumbnail
images
provided for all the NGC/IC, and PGC objects these cannot be individually
disabled like those images found in the image groups where you have full control over
each image state.
If you want to turn off all DSS thumbnails, click
View |
Non-Stellar Options. Remove the check mark next to
"Plot DSS thumbnail images
of NGC, IC PGC and PLN objects".
IMPORTANT NOTE: For any objects that have
images in the Image Manager under the Groups associated with them these objects will not
show the default thumbnail image when the image in the group is enabled. However, when
an image is not checked in the group the black and white thumbnail will then show
again. The Image
Group image takes precedence when present.
Disable plotting of ALL thumbnail images
All NG/IC, PGC, and PLN thumbnails disabled
Say you want a very wide field image
shown first say several degrees in size then a higher resolution image of a
smaller area when zoomed further in on the object. Examples: The Tarantula Nebula inside of the Large Magellanic Cloud (LMC), the Horsehead nebula in IC434, or NGC 604 the small knot (a
very large HII region) in
the outer arm of galaxy M33 - NGC 598.
Here is the wide field image of the Large
Magellanic Cloud (LMC) along with the narrow field higher resolution image of the Tarantula
nebula NGC 2070.
NOTE: When you zoom in further on the Tarantula nebula another image
kicks in when the field of view is narrow. At the point where the larger
image is too big to show. You can control this.
Warning. Keep in mind that the more large
Alpha Channel TIFFs active the more time TheSky6 display will take to plot.
Wide field of Large Magellanic Cloud
LMC and Tarantula and then some
High resolution image of the Tarantula
Tarantula shows at narrower field
You are actually in control of when to plot the
image and when to turn it off. This way you can have the larger image
disabled at a narrow field of view and at this point the higher resolution
smaller field image can be enabled for a nice transition. This is
currently being done with the LMC and the Tarantula nebula using two images.
Here is the entry in the Non-Stellar Color image
group for the Tarantula nebula. By changing the last field from the
default 360.00 degrees to 3.00 degrees the second image will kick in just as the
wide field image is not visible.
1|Tarantula.tif|ngc2070| 5.648383|-69.071481| 1.539778| 0.000000|638|808| 0.000000| 3.000000|
Again this could also be done with the IC434
Horsehead region. In fact you could have 3 images, a very wide field,
medium field, and finally a very narrow field showing only the Horsehead if you
like.
How about adding the high-resolution color image from the Hubble embedded in place
for M51?
If you choose to use the Color image make sure you
DISABLE the existing Black and White image first. You can have both the
Black and White and Color images present just enable the one you want then
disable the other. Of course removing the image from a group can also be
done using the image manager.
Here are the image placement details found in the
text file for the Messier Pictures Group namely "Messier Pictures.ImgGrp" as
found in the ..\TheSky6\Data\Pictures\Image Groups\Messier folder.
If you do not have a "Messier Pictures group"
already just "Add a New Group" first then Add The new Image and use the
following for the placement values as per the Add New
instructions. This is Good practice anyway.
1|M51-Color.tif|13.497901|47.212283| 0.747929|91.200000|744|518| 0.000000|5.000000|
Filename, RA and DEC, scale in
arcseconds/pixel, position angle in degrees, image size in pixels x-y,
when to plot (plot when field is 5
degrees or less) in this example.
OK I want this
image. <-- Click here to download the 1.3 megabyte Alpha Channel TIFF in
zipped form.
Unzip (extract) the M51-Color.TIFF into the ..\TheSky6\Data\Pictures\Image
Groups\Messier folder
If you do not have a Messier Group already
either create one or place the file in the NGC Pictures folder. Once you
have the file just add it using the Add New Image
instructions using the above image
parameters.
The Image Manager
M51-color.tif under Group "Messier Pictures"
note Image Properties here
As with all images that are not "copyright free" (true
for data as well) you must respect the rights of the original owner(s)
when using copyrighted materials. If unsure about copyright
infringement it is best to not use the image or at least attempt to contact the
original copyright owner.
Click on the links provided to read their
respective copyright statements
antennae.tif
blinking planetary.tif
blue flash nebula.tif
bow-tie.tif
box nebula.tif
bug nebula.tif
california.tif
cat's eye.tif
cocoon.tif
crescent nebula.tif
gamma cyg.tif
ic11.tif
ic1287.tif
ic1795.tif
ic1805.tif
ic1848.tif
ic2169.tif
ic2220.tif
ic410.tif
ic424.tif
ic426.tif
ic447.tif
ic5146.tif
ic63.tif
ic879.tif
LMC.tif
m10-4.tif
m100.tif
m101.tif
m104.tif
m106.tif
m109.tif
M17.tif
m20.tif
m31.tif
m42-dss.tif
m42-malin.tif
m5.tif
m51.tif
m63.tif
m65.tif
m81.tif
m84.tif
m87.tif
m98.tif
ngc1316.tif
ngc1566.tif
ngc2244.tif
ngc2997.tif
NGC300.TIF
NGC3370.TIF
ngc3372.tif
ngc3576.tif
ngc3627.tif
ngc3628.tif
ngc4217.tif
ngc5128.tif
ngc604.tif
ngc7000.tif
ngc7380.tif
ngc7538.tif
ngc7822.tif
none.tif
pelican.tif
tadpole.tif
tarantula.tif
veil.tif
veil2.ti
And yes suggestions and comments are welcome for the next major release of
TheSky6 in progress.... Please visit the
Software Bisque Support Corner.
* TANJ - an acronym for There Ain't
No Justice.
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