Selective color transparency

Hi
I'm drawing some rectangles on a background that has 2 colors. I want one of the colors in the background to show up through the rectangle, but not the other. Is there any way to do this? i.e. I want to make my rectangle transparent for some backgrounds but not for others.
Any help is greatly appreciated!

not quite - I've got a grid in the back ground with lines of different colors (say gray and blue). I then stick a filled bright yellow rectangle on top of it. The parts of the rectangle that overlap the gray lines need to stay yellow, while the parts that overlap the blue lines need to show up darker.
i.e. opaque for some colors in the background and translucent/transparent for others.

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Action written in CS4 won't run correctly in Elements 11 - specif. the "selective color" layer

I created an action using Adobe Photoshop CS4, and it runs correctly in CS4. When I save and load the action into Elements 11, there is a problem with the selective color layer. The selective color layer shows up in the layer stack along with the expected message that it can't be edited b/c it was created in the full version of Photoshop. However, the layer itself does not have any color/changes in it.
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You probaly need to record the action in a little different way in photoshop cs4 to get the selective color adjustment layer to work.
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gswetsky AT bellsouth DOT net

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Did you apply the recent Epson software 2.1.9 update?
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BOILERPLATE TEXT:
Note that this is boilerplate text.
If you give complete and detailed information about your setup and the issue at hand,
such as your platform (Mac or Win),
exact versions of your OS, of Photoshop (not just "CS6", but something like CS6v.13.0.6) and of Bridge,
your settings in Photoshop > Preference > Performance
the type of file you were working on,
machine specs, such as total installed RAM, scratch file HDs, total available HD space, video card specs, including total VRAM installed,
what troubleshooting steps you have taken so far,
what error message(s) you receive,
if having issues opening raw files also the exact camera make and model that generated them,
if you're having printing issues, indicate the exact make and model of your printer, paper size, image dimensions in pixels (so many pixels wide by so many pixels high). if going through a RIP, specify that too.
etc.,
someone may be able to help you (not necessarily this poster, who is not a Windows user).
a screen shot of your settings or of the image could be very helpful too.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
Thanks!

I have Photoshop CS5 and a Epson 3880 . The print setting dialogue box won't open when selecting color output PRINTER MANAGES COLORS

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http://java.sun.com/j2se/1.5.0/docs/api/java/awt/image/RGBImageFilter.html

Selective color transparency

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