07-20-2022, 04:35 PM
I do not know what you are doing. Looking at your screenshot, the subject looks ok.
Background removed and replaced with white. Starting from that
Colours -> Components -> Decompose (to CMYK) gives a greyscale image with "All black background" layers.
For each layer
Colours -> Invert gives a greyscale with a "all white background"
Background removed and replaced with white. Starting from that
Colours -> Components -> Decompose (to CMYK) gives a greyscale image with "All black background" layers.
For each layer
Colours -> Invert gives a greyscale with a "all white background"