Need advice on getting HSI color from an Image

[marcel]

Oh, yes... Forgot all about that. QPixmap doesn't expose pixel data. You could convert it to a QImage, although this adds a bit of extra overhead:

QImage img = pixmap()->toImage();
 
.... later, in mousePressEvent
QRgb color = img.pixel(mouseX, mouseY);

QImage img = pixmap()->toImage();

.... later, in mousePressEvent
QRgb color = img.pixel(mouseX, mouseY);

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You could create a member QImage so you don't have to convert the pixmap at every mouse click.

See QImage::pixel
QPixmap::toImage and QLabel::pixmap()