On Wed, May 4, 2011 at 6:06 PM, Sebastian Pipping <sp...@gentoo.org> wrote: > Hello! > > > I stumbled upon the article > > Gamma error in picture scaling > http://www.4p8.com/eric.brasseur/gamma.html#Use_a_correct_software > > recently. I was actually pointed to it be some tool applying the proper > algortihm. I think it was command line.
> Especially as I don't trust ImageMagick with files that matter I would > love to find (or re-find) a command line tool that properly handles > Gamma when resizing images. Needs be free software. Anyone? ImageMagick works. I downloaded the Dalai Lama photo from that page and converted it by doing: convert -colorspace sRGB gamma_dalai_lama_gray.jpg -scale 50%% -set colorspace sRGB gamma_dalai_lama_gray50.png And the resulting image is correct.
