I notice, that some image on webpage has bad quality (sharp corners, no anti-aliasing). I use Qt 4.7.4. This bug not found in Qt 4.8.0 RC1 (I've tested, all OK). How to remove this bug?
Update: examples http://piccy.info/view3/2305599/c2991408a666393dd49bbcc938ad2f9f/ - Qt 4.7.4 http://piccy.info/view3/2305604/9ac2408088af261edef3b852c4127414/ - Qt 4.8.0 RC1
On webpage images in jpeg. Can I remove this effects?
If it's resolved in Qt 4.8.0 you have two options, upgrade to it either as the RC (which for a production app is risky)/ wait until 4.8 is production ready (soon-ish) or my personal favourite which is pull QtWebKit 2.2 into your development environment. It's not straight forward, but you'll find that it's doable.
Or backport the fix for it, which will be probably more difficult than integrating 2.2 into your build.