Hey guys, I just tried to uploaded my current episode and ended up playing around a bit.
In my case the problem is definitely the color.
My comic is black/white with tones and the site always chokes on them, even with tiny size (one was 80kb, for f’s sake! )
I overlapped a color layer on one of my panels and it uploaded it within an instant (although the colored version was twice as big as the b/w original which I couldn’t get up).
Same probably goes for text in b/w.
I bet they have a program which blocks certain images from uploading in order to prevent spam (dunno if something like this is possible since I have no idea about stuff like this )
Anyway, my current arc takes place during a Blackout, so I struggled through the upload with further edits..(took me forever, grrr). But with the following arc I will overlay all my comics with a colored gradient. If that’s the only way to get my stuff up there, so be it ...
If your comic is b/w too, add some color or an overlay. I’m not sure if that’s the resolution to the problem. It works in my case and is still a lot better than compressing your files to tiny size but crappy quality....