Version:           1.6.0 (using KDE 3.5.5 "release 19.1" , openSUSE )
Compiler:          Target: x86_64-suse-linux
OS:                Linux (x86_64) release 2.6.16.21-0.25-default

Use case: clean-up/rotate of a newspaper-article-jpeg taken with digital camera, so that there is high black/white contrast

Steps to reproduce:
1. load jpeg
2. fumble contrast curve to high-contrast (hard black-and-white for good readability)
3. rotate pic 90 deg clock-wise
4. pic is now blurred, the fonts have grey smears as if there is a blur filter added!

Expected:
4. pixels are unchanged in case of exact 90 / 180 / 270 deg. rotations.

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Btw:
2. there should be an extra, easy GUI with just two sliders for contrast and brightness. That gives faster workflow than the (more flexible, but harder to use) curve editor.

-- Preview pics in filter previews are not too useful in icon size, but in 1:1 preview the whole large image is rendered. I would like a fast preview rendering in 1:1 pixel of just small clip, maybe center-of-image, by default.