negative images

How do you convert QImage and QPixmap (that are grayscale) to negative mode? Is there a function for that?

Quote:

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Originally Posted by tommy

How do you convert QImage and QPixmap (that are grayscale) to negative mode? Is there a function for that?

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What Do you mean by negative mode?

You have to negate each pixel in the image or negate each colour in the lookup table (depending on the mode of the image). To negate a grayscale color, you can use

Code:

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int v = 255-qGray(color.rgb()); 
QColor result = QColor(v,v,v);

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Or you can use QImage::invertPixels :)