negative images

[tommy]

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

[ashukla]

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

What Do you mean by negative mode?

[wysota]

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

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

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

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[aamer4yu]

Or you can use QImage::invertPixels