Problem with NSColors in cocoa

Question

i am trying to compose colors using NSColor and when i am trying to create RGB color with the following values it just displays the white colors instead:

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Answer 1

NSColor components have values in [0..1] so you should normalize the values you have, e.g.:

NSColor * myColor = [NSColor colorWithDeviceRed:100.0/255 green:100.0/255 blue:100.0/255 alpha:1.0];

If you try to set values greater then 1 to colour components then they're interpreted as 1, so your code will be actually equivalent to

NSColor * myColor = [NSColor colorWithDeviceRed:1.0 green:1.0 blue:1.0 alpha:1.0];

Which creates white colour.