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Re: invert_ct? [message #4576 is a reply to message #4569]

Wed, 07 June 1995 00:00

rivers
Messages: 228
Registered: March 1991

Senior Member

In article <3r3979$25me@yuma.ACNS.ColoState.EDU>, dean@phobos.cira.colostate.edu writes:
>
> There is h_eq_ct and gamma_ct, but is there a invert_ct to invert the
> color table of a raster image. If not, what would be the simplist way
> to invert the color table of an image with IDL?
>

xloadct() has an "invert_ct" option. Here is the code which does it.

"REVERSE" : BEGIN ;Reverse the table
l = lindgen(ncolors) + cbot
r_orig(cbot) = reverse(r_orig(l))
g_orig(cbot) = reverse(g_orig(l))
b_orig(cbot) = reverse(b_orig(l))
goto, set_gamma ;And redraw
ENDCASE

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		Re: invert_ct? By: Greening C M on Thu, 08 June 1995 00:00
		Re: invert_ct? By: rivers on Wed, 07 June 1995 00:00

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