Hex web colours

Posted by Mick on Stack Overflow See other posts from Stack Overflow or by Mick
Published on 2010-04-24T19:44:49Z Indexed on 2010/04/24 19:53 UTC
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color

Hi I am displaying a colour as a hex value in php . Is it possible to vary the shade of colour by subtracting a number from the hex value ? What I want to do it display vivid web safe colour but if selected I want to dull or lighten the colour. I know I can just use two shades of colour but I could hundred of potential colours .

to be clear #66cc00 is bright green and #99ffcc is a very pale green . What do i subtract to get the second colour ? is there any formula because I just can get it .

Thanks for any help

Cheers

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