What program do you use do digitize? Or is it digital art? I use photoshop and lightroom and just have a Lit export setting. I do a jpeg, no larger than 100kb, and the longest side being no more than 800 pixels. Generally I do 74 PPI as it helps lower the file size even though it KILLS me. Good luck!
I'm a technical doofus here. The file in question was 2700KB JPEG though I've posted illustrated stories with multiple JPEGS and had no problem. Should I go ahead and compress it?
