Forums » Help » Color requirements on the Canvas? Getting some weird artifacts

Hello all,

I was toying around with a super cool background that is very dark. For some reason there are very certain shades of black that are coming out as pure black only when being rendered in impact.

Of course, I'm on lunch and don't have a screenshot to show (I may post one later if it helps), but the question is:

Are their technical requirements or limits concerning colors? Is there anything I can do in gimp when saving to ensure that there are no color artifacts on the canvas? (I've messed with impact a LOT and have never had this issue before)

Thanks!

Pretty sure HTML5 canvas doesn't have any color limitations and it wouldn't have anything to do with Impact as far as I could imagine.

Does your image have an alpha channel at all? Any transparency would be mixed with the default clearColor of black (unless you changed it). Still Black + Off-Black != Black.

What format are you saving your images as? Is there compression involved?

Does it only look correct in Gimp (after saved)?

I guess the blending with the clear color could do it. I'm going to experiment when I get back to it to see if that's the cause. But like you said, off black on black shouldn't cause a pure black (at least not at these shades)

I'm saving as png with alpha (it's a parallax scrolling doohickey with multiple layers). I also tried exporting the problem layer as a jpg to no avail.

Thanks, I figured out what was going on, there was something about the color/image that the imageblender plugin didn't like. When I removed it, everything was fine!