Hue value incremented/decremented by a small value

[SvSlazer18]

Let's say I pick a hue (H on HSV) value of 250 on the color window. Sounds normal. I then click back on the window. Now it's not 250 anymore; It may be 251, 249... Maybe even 248. Why does this happen?

[MJW]

It happens because colors are stored as Red, Green, Blue, not HSV. When you enter an HSV value it's converted to RGB, then the HSV value for the RGB is displayed. For example, suppose you have a color with a very low value, so there are only 3 bits of non-black color. There aren't 360 hues that can be formed from those bit combinations, so some hue values won't be available.

[SvSlazer18]

I didn't know about that. I will always rely on RGB from now on.

[Ego Eram Reputo]

^ Good idea.

 

There is no 1:1 mapping of RGB to HSV and HSV to RGB. What you're seeing are differences in rounding. Relying on the RGB values and ignoring the HSV is the way to go.

[MJW]

I wouldn't say ignore it. Just be aware of the limitations. It's a lot easier to make a color darker without otherwise changing it by adjusting the value then by fiddling with the RGB.