QPixmap blur when QGraphicsView scale

[shanshan]

Hello,

thanks for your fast reply. But this explains that one step scale, that 1.2, 1.3, 1.4... only one image pixel is interpolated. But our case is that we scaled many steps, the image is zoomed 1.5^9 times to 38.4434, but not only one pixel at 39 is interpolated, but multiple of them.
Thant means that when the picture of (1*2) is zoomed to (1,77), (1-38) should be black, but they are not. about( 20-38) are all random and they change when we drag the image. That is why we thought it is a bug of qt

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Added after 7 minutes:

The pixmap is 1024*768, the line is at 767,
the line stays between two pixel when zoom 1.5^8 = 25.6289, get higher at 1.5^9 = 38.4434 and move back between two pixel at 1.5^10=57.665

this is just an sample that to point out the problem, our users need to see the circles or results inside exact each image pixel, cannot accept them move around and back.

qt1.jpg