Here is a chip with a white background. Size of compressed file at max compression: 91 KBy.

These scans were made using pure white and pure black backgrounds generated by Photoshop. If you use the inside of the scanner cover or a black towel as your background, your results may vary.

Just wanted to provide some samples to backup my earlier post that you won't end up with larger files to contend with if you decide you like black rather than white to contrast with your chips.