I assume you played around with the curve tool? Although you can't enter
precise values, the values are displayed in the top left corner, so it's easy
enough to get the result you want.

More here:

On Fri, 14 Oct 2005 13:48:59 +0200
"Felix E. Klee" <[EMAIL PROTECTED]> wrote:

> I want to bend an grayscale image's gray level curve so that three input
> levels are turned into three output levels.  For all six levels I have
> the precise values, for example acquired with the color picker tool.
> So far, I've played with the tools in the right mouse button menu "tools
> / color tools", but unsuccessfully.
> Any suggestions?
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