QImage::scaled cause "raster"/"grid"

[wysota]

Can you replicate it with some arbitrary image downloaded from the Web?

[wesley]

Can you replicate it with some arbitrary image downloaded from the Web?

No, i tried to load the image got from web into a QImage, then scale and display it, There is not the "raster" problem.

[wysota]

But did you do the same conversion you have been doing for your image?

[wesley]

But did you do the same conversion you have been doing for your image?

no, because the conversion is used to convert a raw image data to RGB data, but the web image is already RGB (load with QImage)

[wysota]

Well, obviously QImage::scaled() works in general so you don't have to check that. Find a raw image, convert it using your routine (to test your routine) and then pass it through QImage::scaled() to see if you obtain a similar effect.