In GIMP, when converting the color mode of an image into indexed, you are presented with the following dialog:
When you let GIMP create the palette for you, you are able to specify the maximum number of colors. However when you use a custom palette, there seems to be no equivalent option for limiting the number of colors used.
What are some ways to work around this?
I want GIMP to calculate the closest colors among those in my custom palette so manually trimming the palette is not ideal.