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using TVRD(true=0) with a 24-bit image and decomposed=0 [message #38792]

Mon, 29 March 2004 12:18

odell
Messages: 6
Registered: September 2003

Junior Member

To all IDL color-masters,

I am trying to simply read an image that was originally plotted like
this:

tv, image

where image is a 2D byte-array of colors IN MY CURRENT COLORTABLE; ie,
numbers from 0 to 255. However, I am on a 24-bit display. I have
device, decomposed=0
and backing-store set on retain=2.

If i do this:

im2 = tvrd()
tv, im2

I get way more color=255 than I should; i do not get back the precise
original image. I understand that I can get the RGB triples by doing
tvrd(true=1), but *I don't want the RGB triples*. I just want the
simple numbers from 0 to 255 that I originally plotted. How do I get
them using tvrd()?

Thanks anyone who can help with this!
Chris O'Dell

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[Message index]

		using TVRD(true=0) with a 24-bit image and decomposed=0 By: odell on Mon, 29 March 2004 12:18
		Re: using TVRD(true=0) with a 24-bit image and decomposed=0 By: Karl Schultz on Wed, 31 March 2004 13:42

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