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Why not check out the GIMP registry for more scripts? The registry can be found here. Make sure you get a script compatible with your version of the GIMP.
If you've got GIMP version 2.3.5 and you find a script you think might be really cool but it's for a previous version, try the script update tool in our tools section.
lab-color-punch allows you to change the colors within your image. It registers itself as
This script requires plug-in-decompose, and plug-in-drawable-compose. The H-Channel allows you to fine-tune the Saturate/Desaturate/Color Tint operation to be carried out in parts of the image that corresponds to the image's highlight or shadow area.
The H-Channel sensitivity allows you to enlarge/shrink the portion of the image which are designated as highlight or shadow regions.
Increasing sensitivity selects more highlight/shadow regions. Decreasing sensitivity shrinks the highlight/shadow regions.