I want to use a specific palette to make it strictly index color.

[Ofnuts]

In the palettes list, you can import a palette from an image, and when converting an image to color indexed, you can specify a color palette.

Quote:Is there a way to convert the color information in the custom palette without tampering with it?

What do you call "convert"? Or do you want to map your image to another palette using the same color indices?