I mentioned this problem once before, but I couldn't quite explain and/or depict it very well, but this example should be much more noticeable. Most imagery programs seem to have this problem where they don't blend smoothly enough when you have multiple colors and shades blending into one another at the same time. At first I was thinking it was simply because there's not enough colors in the digital color gamuts to fill in between each color, but after applying a gaussian blur to it, most of the solid lines are smoothed away, but I have had occasions where even blurring it out this way still produced very defined noticeable lines. A lot of people have told me they can't even see it with a lot of the other examples I've come across, but I can see it way better in this one. I'm wondering if I'm doing something wrong, or if I'm just trying to stretch the blending too much and hitting the outer range of the color gamuts. If you haven't seen what those are, look here.

http://synergenstudios.com/wp-conte.....t-rgb-cmyk.jpg

That is what RGB and CMYK look compared to each other and to the total color spectrum as is visible to human eyes.