Quick'n'dirty color correction batch tool. It's a two-step process that works by burning-in a "known" color palette into a reference image. You then color correct this image, say in GIMP, and then apply the transform to a batch of images.

Problems:

• Doesn't copy metadata (could possibly be handled using exiftool -TagsFromFile)
• Doesn't copy file date
• Single-threaded / not parallelized
• Performance? Trilinear interpolation might actually be slower than cache misses in a 1:1 256×256×256×3 LUT (48MB)... let's find out?