I came across this tool that will be practical using the first top box (deg)
http://www.workwithcolor.com/hsl-color-picker-01.htm
I have this css code:
#FullMenuContent input:checked { -webkit-filter: hue-rotate(290deg);
filter: hue-rotate(290deg);
That produces a color, fine. I understood that the image must have a color (does not work on grey scale). I understood that the final result depends on the color of the image, so my question is:
What should be the color of the image for the color picker linked above to be accurate?