This happens when the HEX value is near 000000 (black) or FFFFFF (white) (even if the color itself is not a near shade of black or white). The slider will become available as soon as the HEX value changes enough.
Brightness slider is disabled
This happens when the HEX value is near 000000 (black) or FFFFFF (white) (even if the color itself is not a near shade of black or white). The slider will become available as soon as the HEX value changes enough.