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Re: Color BMP problems [message #11507 is a reply to message #11290]

Wed, 01 April 1998 00:00

dwc
Messages: 2
Registered: April 1998

Junior Member

In article <6fjn2o$6kh$1@sienna.impulse.net>, jfulton@impulse.net says...
>
> I use the following lines to make a bitmap file of the active window and the
> resulting file seems to have different colors from the original when I view
> the file.
>
> TVLCT, R, G, B, /GET
> image = TVRD()
> WRITE_BMP, 'temp.bmp', image, R, G, B
>
> I am using Win95 with the screen set at 16 bits. I am also using the
> supplied color files that comes with IDL. Any ideas why?
>

This may be due to the Microsoft primary ordering which is BGR not RGB. The
following code works fine on 16bit/24bit displays under Win95:

save_bmp = 'foobar.bmp'
bmp_image = TVRD(/TRUE)
; change from RGB to BGR for .BMP
chan_temp = bmp_image[0,*,*]
bmp_image[0,*,*] = bmp_image[2,*,*]
bmp_image[2,*,*] = chan_temp
write_bmp, save_bmp, TEMPORARY(bmp_image)

I have found that Truecolor graphics work great under 5.0.2 - I avoid using
color tables and color indexes as much as possible.

Dave Coulter
dwc@nel.newmont.com

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[Message index]

		Color BMP problems By: James Fulton on Sat, 28 March 1998 00:00
		Re: Color BMP problems By: dwc on Wed, 01 April 1998 00:00
		Re: Color BMP problems By: davidf on Tue, 31 March 1998 00:00

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