New answers tagged contrast
Why not use the color schemes given by google: http://www.google.com/design/spec/style/color.html Find your original color of which u wish to find the contrast and find its adjacent numbers of other colors. For Ex. your original color is 600 of original color then the 600 of other colors can be selected of your choice
This online app is more than enough to do your job. Color Scheme Designer 3
If you know the CMYK or RGB value - Open Photoshop color picker by clicking on any chosen color. In your color picker, Insert your CMYK or RGB value and scroll your color picker down the central vertical color bar through your reds, blues etc. Your color picker identifies the family.
I don't think there is a straight cut answer, because this is a optical illusion (Everyone see's colors a little differently). Depending on what your end medium is I would suggest testing (print it out or test on different monitors/screens - also grab a few friends for their opinions). Trial and error would be my method starting with 2-3% increments. ...
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