How do I subtract a background form star images?

I am taking night sky star images through a telescope with Canon Rebel.
If I invert the image I see a gray background that is the light pollution here in Chicago.
How do I select this background and subtract it from the image to get rid of the light pollution &
leave just the stars on a white background?
If I do that to several images, how do I then add them?

I had to convert your GIF file to JPG before it would open in Elements.
http://www.pixentral.com/show.php?picture=14OEMmCPymKUzAVYQl4EwfKrHQ0j1
Open picture file
Duplicate background layer, work on background copy layer
Shut off visibility of background layer by clicking on its eye icon in layers palette
Access magic wand tool. I used tolerance=32, but experiment with other values.Leave contiguous and use all layers unckecked.
Left click, hit delete on keyboard.
Go to Select>deselect. May have to use magic wand again in other stray areas
Open blank, new layer, and place between background and background copy layers
Make blank layer active, go to Edit>fill layer>white

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Photoshop's "Background" is a special layer and does not support transparency. You need to convert a Background layer to a normal layer if to want to cut out parts of the layer.

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...How do I make the background in an image transparent?

It sounds like you're gif is a picture of a white background with a black chess piece on top. If that's the case, you're going to have to cut the black chess piece out of the gif. Save ~just~ the image of the chess piece. Discard the white background. Use only the image of the black chess piece with no background image at all.
Keep in mind that Java doesn't know that the white background isn't a part of the image. It doesn't understand that the white part is just the background. As far as it's concerned, the whole gif is the image. Only the component that ~contains~ that gif can become transparent.
So, if you want to have a white background to start with and then have that background become transparent when the piece moves, make the background of the ~component~ holding the image of the chess piece white. When the piece moves, have the background of the component holding the image of the chess piece become transparent.

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how do you remove the background from an image thathas a white background?

First, change the background layer to a normal layer if needed, by dragging the padlock to the trash can.
Then use the quick selection tool or magic wand tool to select your background.
Now you can either delete the background, or click the icon at the bottom of the layers panel that looks like a circle inside a square. This icon will convert the selection to a mask.
The advantage of the mask is, it is non-destructible. In that you can change your mind at any time. Whereas deleting pixels is permanent once you close the file and there is no duplicate files. (A way around this is to make a duplicate layer and hide it. But that does make the file larger.)

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Not directly this time, I believe, but by a post web gallery generation hack to the generated files.
Don
Don Ricklin, MacBook 2Ghz Duo 2 Core running 10.4.10 & Win XP, Pentax *ist D
See LR Links list at my
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T-Shirt designing #2: How do I change the background of my image?

Using CS6...
I'm also using the t-shirt template.
On my screen is a t-shirt with a small rectangle inside of it. And another large rectangle beside it. I plan on making my image inside of the large rectangle (which is also the guide).
Right now it is white but I would like to change it to different colors and I would need for this color to be part of the image once completed. I tried clicking on stuff (everything is highlighted) but the background color within the guide never changes.
Can someone provide the steps?
Sincerely,
Rookie

Wdautrion, Christ-Guard, others,
I originally skipped this thread because I assumed it was about the specifics of certain T-Shirt templates, based on the related #1 thread.
However, its seemingly going on and on made me finally read it, and ponder. I believe a few things are worth adding, even if it may seem too long already.
As I read the OP, it is simply a question about a rectangular Guide (a Guide that was originally created as a rectangle) which may seem to have a white fill and the wish to switch to another colour, to form a background that is part of the artwork.
Had I read the OP before anything else had happened, I believe my answer would (just as simply) have been something like:
Guides are non printing, and they have no fill. You can see that if you View>Show (Transparency) Grid.
To get a corresponding coloured rectangular fill that forms part of the artwork, you may:
1) Drag with the rectangle Tool from the top left to the bottom right of the Guide rectangle,
2) Set the fill colour as desired and no Stroke,
3) Lock the rectangle to avoid selecting it (until the artwork is finished).
There are other ways, but I should prefer this to others that may require more explanation (such as a few involving releasing of the Guide).
Other aspects of the thread are ways of learning, and of efforts/attitudes, including using the manual/helpfile.
It is worth mentioning that the link in post #11 refers to only three out of four learning styles (VAK instead of VARK), the fourth being reading & writing. This is (just) one of many models, as it appears from this Wikipedia article (which also leaves the forurth one out):
http://en.wikipedia.org/wiki/Learning_styles#Neil_Fleming.27s_VAK.2FVARK_model
A fuller VARK explanation may be seen here:
http://psychology.about.com/od/educationalpsychology/a/vark-learning-styles.htm
I mention this because there is a crucial difference between visual and reading & writing, which I believe is important for this thread.
Whichever faith anyone may have in such models, I believe there are significant differences in how different people learn.
I also believe that no learning style should be frowned upon.
I am convinced that some of the difficulties in mutual understanding, and in writing/reading posts, arise from such differences.
With regard to efforts/attitudes, it is important to work smarter, not harder,
http://en.wikipedia.org/wiki/Performance_consulting
but what that means rather depends on learning and working style(s). What is best and most efficient for one may appear as laziness, or as hard work, or as silliness, for another.
Also, it may be argued that, depending on the actual task, the use of some features/procedures, maybe especially some of the easy ones in later versions, may be considered either efficiency or laziness/sloppiness.
With regard to using the manual/helpfile, RTFM is a small effort for some, a greater or even forbidding one for others. Probably most would agree that it is much easier to use when you get used to to it and/or have known Illy for a while and know your way round.
I only remember one instance, in another forum, with a poster actually declaring himself that he was lazy; and he was gently and friendly but clearly told to work on his attitude, which he agreed upon.
You may say that all this is easy for me to say, because I am lucky to actually enjoy the challenge of finding ways to brídge differences and difficulties in learning, here and elsewhere. Some of what I do is to help and teach across styles. One recent urgent and pleasant challenge was a mid afternoon phone call from a carpenter about a simple crude (too) steep staircase/(step)ladder fitting a certain space; he was completely at a loss. I asked when he was going to build it, and the answer was: "Now". He was on the site, and all he had to work with were some leftover 45x245 mm rafters. I asked for the height from floor to floor (total rise) (2230 mm) and the available horizontal space (containing the total going and then a bit) (1500 mm); 10 minutes later, I could tell him an adapted/failsafe way to shape the stringboards and place the steps, with only four measures to mark, the rest being pure carpentry work, devised while getting the measures from a quick drawing with the help of Illy, of course. He fitted the staircase precisely and was happy (as was the customer), and baffled.
In any case, now I said it.

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http://fc08.deviantart.net/fs47/f/2009/166/0/5/Straw_Hat__s_Flag_by_fenrir1992.jpg
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I'm trying to migrate an Application Instance Form from my Dev env to my QA env.
My target system is SAP
I performed the following steps in Dev:
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2. Created a sandbox
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My env:
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OIM: 11gR2 BP7
SAP connector: 9.1.2.2.0
Thanks,
Adr

This is a bug: Bug:16027176
Check the [Article ID 1515225.1] which proposes a workaround that might be useful in your case (it was not in mine).
In short the workaround is:
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Adr

How do I subtract a background form star images?

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