So long as the images are one sided and less than 2/3s of the actual size, colour isn't the problem. I suspect the real issue is that they have this huge collection of B&W scans. They'd have to rescan all the notes and since they don't have access to most of them anymore, it's a problem.
We started trying to collect colour images of all the notes on the main site to try to address this, but the task is huge. Maybe if the forum members got organized, we could help them out.