How to recolor jpeg-mask?

[anto]

I have jpeg-mask with white borders. How to recolor white borders as background color?

[markw]

If you are using APhoto then try;
On the canvas have the Masking layer above the image of the bird.
In the Layer stack, have the Masking layer directly above the bird layer.
With the Masking Layer selected go to; Filters > Colours > Erase white Paper.
In the Layers panel with the Masking layer still selected; right click and choose Mask to Below. Or drag the Masking layer’s thumbnail onto the thumbnail of the bird and let go.
That should do it.

[anto]

Thanks. It works

[thomaso]

Or: 1.) Invert the masking layer + 2.) choose "Rasterize to Mask".
This makes its white transparent without the need to delete pixels or to use blend mode 'Lighten'.