That's also true. I'm not sure how well the latest versions of promotion or photoshop handle colour spaces but if there is no easy way to alter the hue without the luminance also being affected
no, although
LCH color space is capable of altering hue with relatively minor shifts in perceived intensity (much much much lower than HSV, or even HSL)
(that page makes it look a bit more complex than it is. LCH is simply a transform of the LAB colorspace into polar coordinates.)
LAB has the same properties, except you cannot alter hue directly.
Photoshop seems to use LAB for it's Color mode.
then at least people could pick colours from the palette image I posted, or maybe an expanded image. Then at least they will be able to mix colours with less visible patterning in the dithering (albeit with all monitors and peoples eyesights being different)
I suppose the stumbling block here is that with few colours you want to have a full range of shades, where as this technique lends itself more to groups of identical shades of different hues.
Yes. I've generated an 'optimal' 256-color LCH palette, which matches more the general trend in good pixel art of having every color in the palette be a unique brightness. I've tried arranging it, I think that it's nearly impossible to make a really good palette that does not possess the aforementioned property; I could only arrange it into ramps, but not into exactly-aligned ramps of the same length.
