Hey guys,
Quickly edited this plugin to also convert the layer colors, instead of assigning a random color per material.

Very useful ! Thanks

Update to also convert the layer color.

Reverse question - is there a way to exclude 100% transparent material from the material ID render ? Say I have a texture of a tree where the foliage is opaque and an alpha channel masks what's not needed. Material ID still considers the transparent surface as a different material.

When a lot of objects are in background, selection is not optimal.

Thanks