![]() ![]() In the red, it's around where it turns from smoothly increasing the R in the RGB to adding G to become yellow - around #FF0000 to #FF2500.Grab a colour picker and look at the gradients, and you'll notice that the bands are around the points where the nature of the gradient changes: Look at it in RGB terms, and the cause of the bands is actually pretty simple. At some point, it has to tell the red, green and blue pixels of a screen what to do. Update: Here's a plot of this colormap in the RGB cube, showing the sharp angles user568458 is talking about:ĭon't forget that, even if you're working with LAB colour values, RGB values have to be output to show it on a screen. It follows a uniform ramp along the L* direction, and it follows a semicircular path in the a*-b* plane.") How do I smoothly transition through colors without banding? Are there rules for making smooth curves through Lab color space or something? ( Edit: Ooh, I found an example for this: "The color scale is computed using the L ab* color space. So discontinuities in the luminance plot are not the cause of the problem. The yellow and orange bands are still there, they're just moved and smeared out a little. ![]() It's better, but I still see bands in it.įor another example, for the hot colormap, I thought maybe I had to linearize the luminance plot to prevent banding, but it didn't really work: I manually tweaked it to try to get rid of the bands, and somewhat succeeded, but I don't really understand the theory behind it: Here's a plot of the RGB components, and a calculation of relative luminance in black: ![]() It's almost like a ring of neon orange around 0.2, and a similar one for blue around -0.2. I believe they're a form of Mach bands?įor instance, I used this bipolar colormap and it produces images like this: In colormaps used for visualizing data, there are often bands of color that stick out when they shouldn't. So this is more scientific visualization than graphic design, but I think the theory is the same. ![]()
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