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Re: 8 to 24 bit conversion [message #41685 is a reply to message #41684]

Tue, 09 November 2004 15:21

KM
Messages: 29
Registered: October 2004

Junior Member

On Tue, 9 Nov 2004, Liam Gumley wrote:
>
> Ken Mankoff wrote:
>>
>> I am trying to convert an 8 bit image created in the Z buffer to
>> a 24 bit image. Is this possible? I would think so. But I am
>> having trouble getting it to work.
>>
>> I based my code off of this algorithm:
>> http://groups.google.com/groups?hl=en&lr=&selm=c0jq0 j%24i40%241%40nntp6.u.washington.edu
>> But I don't want to use the COLOR_QUAN bit of code that reduces
>> it back to 8 bits.
>>
>> image = TVRD()
>> TVLCT, R, G, B, /GET
> dims = size(image, /dimensions)
> true_image = bytarr(3, dims[0], dims[1])
> true_image[0, *, *] = r[image]
> true_image[1, *, *] = g[image]
> true_image[2, *, *] = b[image]

OK, that is quite a bit more succinct. But the colors still aren't
right when I "TV, true_image, /true"

Thinking it could be a display issue (decomposed, true_color,
pseudo, etc.) I tested it by writing true_image out to a png and
jpeg, but they don't look write.

FYI, the above function I called toRGB, and my test code is:

loadct, 39
tv, congrid(indgen(16,16),640,512)
x = torgb()
;loadct, 0 ; tried w/ & w/o this commented
tv,x,/true ; produces color, but not same as last tv command

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[Message index]

		Re: 8 to 24 bit conversion By: David Fanning on Wed, 10 November 2004 06:10
		Re: 8 to 24 bit conversion By: KM on Wed, 10 November 2004 05:45
		Re: 8 to 24 bit conversion By: David Fanning on Tue, 09 November 2004 23:04
		Re: 8 to 24 bit conversion By: Robert Barnett on Tue, 09 November 2004 22:27
		Re: 8 to 24 bit conversion By: KM on Tue, 09 November 2004 18:26
		Re: 8 to 24 bit conversion By: KM on Tue, 09 November 2004 18:17
		Re: 8 to 24 bit conversion By: Robert Barnett on Tue, 09 November 2004 15:49
		Re: 8 to 24 bit conversion By: Robert Barnett on Tue, 09 November 2004 15:36
		Re: 8 to 24 bit conversion By: KM on Tue, 09 November 2004 15:21
		Re: 8 to 24 bit conversion By: Liam Gumley on Tue, 09 November 2004 14:49
		Re: 8 to 24 bit conversion By: Liam Gumley on Tue, 09 November 2004 14:40

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