Tool for high picture compression with low loss of quality

Question

Is there a tool which can achieve high picture compression while preserving (as much as possible) the image quality and can compress images in batches, in order to make optimal images for websites?

Answer 1

If you want an easy to use tool, try Trimage, which can be found in the Software-Center of Ubuntu. I've also tested pngcrush and optipng but I have to say that Trimage had the best compression rate of these three tools, without having to mess around with the console :-)

sudo apt-get install trimage

Answer 2

I know pngcrush and optipng.

There is also pngquant and pngnq but those are lossy when the original was in truecolor.

For photos you probably want to convert to JPEG instead.

Answer 3

You should take a look into the new WebP format and the tool provided by Google. Is not very useful right now, but according to Google it has 40% size reduction over jpeg, without additional quality loss.

http://code.google.com/speed/webp/

http://en.wikipedia.org/wiki/WebP

http://ubuntuforums.org/showthread.php?t=1585577

Answer 4

I used gimp and followed these instructions: http://docs.gimp.org/en/gimp-tutorial-quickie-jpeg.html

When using Trimage I only got a 2.5% improvement on a 2Mb file but with gimp and exporting as jpeg and dialing the quality down to 10 I got a 2Mb file down to 200Kb or ~90% improvement.