how to update Image

[hakiim35]

hello, I have an Image that is initiliazed in the constructor of my class.
I have a gui that changes the quality of the jpeg image dynamically, I change the quality of the jpeg with

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img.quality

after the user updates the quality from the gui.
Then I convert the Image to a QT image. Now, I want to update the image on the gui. But it doesn't work. Should I call any other function on the Image, just after

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img.quality

?
Thanks in advance.