Change contrast in Java BufferedImage

Posted on 2011-05-05
Medium Priority
Last Modified: 2013-11-23
I need to change the contrast (and maybe the brightness) of an image in Java. It is a BufferedImage that I create, and it is made of different geometrical items. I have to change the contrast of only some of these items. The items to be changed are all of the same color.
Also, these elements are traslucent, so I am using Transparency.TRANSLUCENT function.
I don't know how contrast and transparency interact...

Question by:v_alev
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Author Comment

ID: 35698049
But I have to change the contrast of only one color relative to the background, not all the image.
Can you suggest a way to do that?
LVL 92

Expert Comment

ID: 35702647
you can just change the color table (ColorModel) of the image to achieve that
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Author Comment

ID: 35735740
Can you be more specific?
Which is the part of the code that influence the contrast?
Also, do you know how transparency and contrast interact?
LVL 92

Accepted Solution

objects earned 2000 total points
ID: 35736177
Contrast multiplies colour values by a scale factor.
It has nothing to do with transparency

you can achieve it by using either a RescaleOp, or by adjusting the colour mappings in the colour table
LVL 60

Expert Comment

by:Kevin Cross
ID: 36923072
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.

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