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negative

Started by Pillejunior Mar 10, 2004 at 5:04 AM 3 replies 400+ views

Original Post

Mar 10, 2004 at 5:04 AM

quick question: how do you calculate the negative of a color? And for example if it is stored as FF FF FF rgb. Where do i subtract/add/?? it with thanx in advance

aboeing

Mar 10, 2004 at 5:13 AM

depends on what you define as the negative.
usually you mean to ''invert'' the color

so the opposite of 0xffffff (white) would be 0x000000 (black)

so one way is to use the bitwise negate operator
(so assuming your using C:
negativecolor = ~color;
)

or just going:
negativecolor = 0xffffff - color;

Pillejunior

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Pillejunior

Mar 10, 2004 at 5:22 AM

i use delphi and i just used ''xor FFFFFF'' and that works. Thanx anyway!!

aboeing

Mar 10, 2004 at 5:34 AM

the delphi bitwise not operator is simply ''Not''

shmoove

Mar 10, 2004 at 9:22 AM

Yeah, ''not'' would work just the same since it''s equivalent to ''xor FFFFFF''

shmoove

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