Change Backgroundcolor for ripping from GBA games (VBA))

I've tried to rip some GBA sprites with the VisualBoyAdvance Emulator.

The problem is, that if I disable the Background layer, the Backgroundcolor is black in some games.
And in the Games I tried, it shares the color with some outlines or parts of the sprites I wanted to rip.

Is there a possiblity to change the backgroundcolor to pink (or another color for easier ripping)?

Thanks in game boy advance