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24 bit colors in IDL [message #13280]

Tue, 03 November 1998 00:00

Richard Penrose
Messages: 4
Registered: November 1998

Junior Member

I am working on a piece of software written in IDL that has always
assumed the color resolution to be 256 colours. I would like to be able
to use the same piece of software on a machine which has a flashy
graphics card and only allows a colour resolution of 24 bits (True
Colour).

At the moment when I change the colour resolution it messes up all of
the software's colours. The piece of code that we use to set up the
colours is as follows:

iaR
= $
[255,1,192,128,255,142,255,213, 0, 0, 0, 0, 0,
0,255,197,248,247]
iaG
= $
[255,1,192,128, 0, 0,255,213,255,176,255,171, 0,
0,192,138,208,167]
iaB
= $
[255,1,192,128, 0, 0, 0, 0, 0, 0,255,171,255,185, 0,
0,198,195]

tvlct, iaR, iaG, iaB

st_color = { $
i_white : 0 ,
$
i_black : 1 ,
$
i_light_grey : 2,
$
i_dark_grey : 3,
$
i_light_red : 4,
$
i_red : 4,
$
i_dark_red : 5,
$
i_light_yellow : 6,
$
i_yellow : 6,
$
i_dark_yellow : 7,
$
i_light_green : 8,
$
i_dark_green : 9,
$
i_light_cyan : 10,
$
i_dark_cyan : 11,
$
i_light_blue : 12,
$
i_dark_blue : 13,
$
i_light_orange : 14,
$
i_orange : 14,
$
i_dark_orange : 15,
$
i_light_pink : 16,
$
i_dark_pink : 17
$
}

We then use the st_color structure to access the iaR, iaG, iaB arrays
and get the desired color, e.g. [1,1,1] should give black and
[255,255,255] should give white.

Now it seemed obvious to me that to upgrade to 24 bit colours all I
needed to do was to
multiply each element of the iaR, iaG, iaB arrays by 65536 and subtract
1. Disappointingly this does not seem to work!

Can anyone help.

Cheers Richard

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[Message index]

		24 bit colors in IDL By: Richard Penrose on Tue, 03 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf7203 on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: philip aldis on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 12 November 1998 00:00
		Re: 24 bit colors in IDL By: Richard Penrose on Wed, 11 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Thu, 19 November 1998 00:00

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