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tvrd with a color table on a 24 bit device, true=0 [message #38789]

Mon, 29 March 2004 14:12

odell
Messages: 6
Registered: September 2003

Junior Member

Hello IDL color-masters,

I am trying to simply read the pixel colors from a window, previously
generated with a command like:

tv, image

where "image" is a 2D array of bytes from 0 to 255, and reflects my
current color table (#39, gotten from loadct, 39). I use retain=2,
decomposed=0 in my device.
I am on a 24-bit display (for certain).

When I do this:

im2 = tvrd()
tv, im2

I do not get what I had before in the window. I get a lot more white.
The basic structure is correct, but clearly the colors are getting
screwed up. I can do tvrd(true=1), but that gives me the RGB triples
and I don't want those, I just want my simple 0-255 color indices for
my current color table. How do I get them?

Thanks,
Chris

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