On Fri, 13 Apr 2001 16:06:22 +0100, David Kirkby <[EMAIL PROTECTED]> said:

>Hi, I'm trying to do something with Gimp that is perhaps a little
>unusual.  This is causing me a problem, but I'd like to know if it
>can be overcome easily. I'm using Gimp 1.2.0 on a Sun SPARCstation
>with Solaris 8.

>I would like to create a bitmap (.BMP) with Gimp that can be read by
>a scientific application I have written. This application looks for
>specific colours such as red (0xff0000), black (0x000000), white
>(0xffffff) and green (0x0x00ff00).

>I need to create an image that uses these colours and *only* these
>colours. However, when I draw a red circle using pure red, on a pure
>white background, the edges of the circle are pink, containing some
>red, and equal amounts of green and blue.

>Likewise if I create a small bitmap (say 5 x 5 pixels) and set these
>pixels to the values I want, expanding the image in Gimp creates
>pixels of intermediate colours.

>I appreciate this is more aesthetically pleasing, but Gimp's
>interpolating colours is causing me a problem. Is there any obvious
>way to stop colour interpolation ?

Use indexed mode.

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