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Re: invert_ct? [message #4580 is a reply to message #4578]

Wed, 07 June 1995 00:00

knipp
Messages: 68
Registered: January 1993

Member

In article 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?
>
> Bonus question - what would be the simplist way of inverting the values
> of an image itself?
>
> Kelly Dean
> CSU/CIRA

Assuming 8-Bit images (8 Bits Per Pixel, grey values range 0 ... 255) try

invert_grey = 255b - original_grey

------------------------------------------------------------ ------------

Karlheinz Knipp
knipp@ipi.uni-hannover.de

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[Message index]

		invert_ct? By: dean on Wed, 07 June 1995 00:00
		Re: invert_ct? By: sjt on Wed, 07 June 1995 00:00
		Re: invert_ct? By: knipp on Wed, 07 June 1995 00:00

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