Hacker News Reader

Comment by matja | Hacker News Reader

ImageMagick and GNU parallel happily max-out all cores on my machine and convert a few hundred images per second:

    find -type f -name '*.jp2' | parallel --xargs --max-args=1 convert {} {.}.jpg

View on HN

Would be yet another lossy transcode, though.

You could convert to png or tiff if you wanted lossless. Jpg at high quality is pretty good for general photo saving if you aren't doing tons of modifications after the fact.

I think some editors now save the original and just store the modification steps (Lightroom does this for raw at least.)

Use JPEG XR, that has a lossless mode and better compression than you would get with .png. Though of course that puts you at risk of using yet another unproven format. Though it seems to be on track to become the JPEG successor from what I understand.

Reply on news.ycombinator.com