JPG File Size Optimization - PHP, ImageMagick, & Google's Page Speed

Question

I have photo gallery code that does image re-sizing and thumbnail creation. I use ImageMagick to do this. I ran a gallery page through Google\'s Page Speed tool and it rev

Answer 1

Run your images through Yahoo's SmushIt service, where the images are converted to a PNG with an exact number of colors. No loss in quality, but a loss in weight :)

Answer 2

I found this SO question, "Tools for JPEG optimization?", that has some good information, but the solutions are outside of PHP. Using hints from that question's solutions I found that there were two lossless optimizations that could be performed:

1. Optimization of the Huffman coding tables
2. Removal of meta-data (EXIF, etc)

Both of can be accomplished with ImageMagick this way:

1. According to ImageMagick documentation, the optimal Huffman coding tables are computed by default. This step is already taken care of, yay!
2. Removal of meta-data can be accomplished very simply by using the stripImage() method.

One image I tested was reduced by 12KB. The 600x450 file went from 63.42KB to 51.42KB, and the 140x105 thumbnail went from 17.98KB to 5.98KB.