Constrasting Color

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- - 10 May 2005 15:04 GMT

If I have a Color object, is it possible to get a constrasting Color in
return?

Black: 255 255 255 becomes White: 0 0 0 so on and so forth...

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Arnaud Berger - 10 May 2005 15:25 GMT

Hi,

What about this :

Color originalColor=....;

int red=originalColor.getRed();
int green=originalColor.getGreen();
int blue=originalColor.getBlue();

newRed=255-red;
newGreen=255-green;
newBlue=255-blue;

Color newColor=new Color(newRed,newGreen,newBlue);

Regards,

Arnaud

> If I have a Color object, is it possible to get a constrasting Color in
> return?
>
> Black: 255 255 255 becomes White: 0 0 0 so on and so forth...

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Anton Spaans - 10 May 2005 15:30 GMT

> Hi,
>
[quoted text clipped - 11 lines]
>
> Color newColor=new Color(newRed,newGreen,newBlue);

This won't work with the color gray........
-- Anton.

> Regards,
>
[quoted text clipped - 4 lines]
> >
> > Black: 255 255 255 becomes White: 0 0 0 so on and so forth...

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Chris Smith - 10 May 2005 15:39 GMT

> > Color originalColor=....;
> >
[quoted text clipped - 9 lines]
>
> This won't work with the color gray........

Okay, so for the maximum difference:

Color originalColor = ....;

int red = originalColor.getRed();
int green = originalColor.getGreen();
int blue = originalColor.getBlue();

newRed = (red < 128) ? 255 : 0;
newGreen = (green < 128) ? 255 : 0;
newBlue = (blue < 128) ? 255 : 0;

Color newColor = new Color(newRed, newGreen, newBlue);

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shakah - 10 May 2005 18:15 GMT

How about converting the color to HSV and jumping to the other side of
the color wheel? I don't think it'll work for greys (including white
and black), though...

java.awt.Color cOrig = ...
float [] aHSB = java.awt.Color.RGBtoHSB(
cOrig.getRed()
,cOrig.getGreen()
,cOrig.getBlue()
,null
) ;
java.awt.Color cCompl = java.awt.Color.getHSBColor(
aHSB[0] > 0.5f ? aHSB[0] - 0.5f : aHSB[0] + 0.5f
,aHSB[1]
,aHSB[2]
) ;

?

> If I have a Color object, is it possible to get a constrasting Color in
> return?
>
> Black: 255 255 255 becomes White: 0 0 0 so on and so forth...

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Marcin Grunwald - 11 May 2005 11:18 GMT

> If I have a Color object, is it possible to get a constrasting Color in
> return?
>
> Black: 255 255 255 becomes White: 0 0 0 so on and so forth...

Maybe use xor function with 255 value:

For example:
0 ^ 255 = 255;
255 ^ 255 = 0;

--
Cheers
grundig

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Eric Sosman - 11 May 2005 15:27 GMT

>>If I have a Color object, is it possible to get a constrasting Color in
>>return?
[quoted text clipped - 6 lines]
> 0 ^ 255 = 255;
> 255 ^ 255 = 0;

And 128 ^ 255 = 127 ...

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Eric.Sosman@sun.com

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Grant Wagner - 11 May 2005 21:05 GMT

>>>If I have a Color object, is it possible to get a constrasting Color
>>>in
[quoted text clipped - 9 lines]
>
> And 128 ^ 255 = 127 ...

Why 128 ^ 255 = 127 is a bad thing is spelled out in more detail at
<url: http://blogs.msdn.com/oldnewthing/archive/2004/11/25/270320.aspx
/>.

Signature

Grant Wagner <gwagner@agricoreunited.com>

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Fred L. Kleinschmidt - 11 May 2005 15:41 GMT

> If I have a Color object, is it possible to get a constrasting Color in
> return?
>
> Black: 255 255 255 becomes White: 0 0 0 so on and so forth...

In general this is a very complex problem. You not only want a
contrasting color - you also want one that "looks good" against the base
color. It is possible, but it takes several hunbdred lines of code.

A good reference for how to do this is Motif's XmGetColors() function.

Signature

Fred L. Kleinschmidt
Boeing Associate Technical Fellow
Technical Architect, Common User Interface Services
M/S 2R-94 (206)544-5225

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