Teller said: They use some effect equivalent to "multiply" in photoshop with a transparency, which has never worked that well. What they need is something more similar to "Overlay" or "Color". But I doubt we'll ever see improvements. The only way to design a token better for tinting is to have it have plenty of contrast, and have it be black and white. Actually, it's a lot simpler than that. They appear to be using something roughly equivalent to what in Photoshop would be a "normal" blending mode of 40% opacity. Nothing special, just a solid color flood with a 40% alpha channel. It doesn't map perfectly in all cases (probably CSS vs Photoshop algorithms), but in the vast majority in the test below, most of the sampled colors read identically to the photoshop eyedropper. The outer samples are placed so that they are side by side with their Roll20 tint equivalents, for easier comparison. They have a layer above them set to 40%, normal, and filled with color blocks using the values indicated in the graphic. This means that white will tint at about 40% of the tint color fairly true at least in Hue. Saturation and Brightness will change. This means that any tint other than black will have a lightening effect on black image pixels. If you tint it a color, you won't have a dark black. Very dark colors can minimize this effect, but can of course, cause the whole image to become very dark and muddy. The only way to really achieve a decent effect is through experimentation, and realize that you will never get something the equivalent of a hue shift (color change, but keeping brightness/darkness the same) or multiply effect (just adding color to an underlying image). CSS does have the equivalent of blend modes, but to be honest, no one blend mode will satisfy all use cases, and most folks don't have a lot of experience with the differences between something like "overlay", "soft light", "hard light" and so on. (AFAIK, CSS blend modes did not even exist when Roll20 was written, and may not even be available in Canvas, or whatever Roll20 uses for the actual VTT display now. In any case "tint" is the wrong word for what is happening here, but is probably the intuitive term most people would expect.
