How can I crop an image in Qt?

Question

I load a PNG image in a QPixmap/QImage and I want to crop it. Is there a function that does that in Qt, or how should I do it otherwise?

Answer 1

You can use QPixmap::copy:

QRect rect(10, 20, 30, 40); QPixmap original('image.png'); QPixmap cropped = original.copy(rect); 

There is also QImage::copy:

QRect rect(10, 20, 30, 40); QImage original('image.png'); QImage cropped = original.copy(rect); 

Answer 2

Use QImage instead of QPixmap:

    QImage image("initial_image.jpg");     QImage copy ;     copy = image.copy( 0, 0, 128, 128);      copy.save("cropped_image.jpg"); 

This code will save a file cropped to upper left corner 128x128px.