Image compression sites and tools summary

A short roundup of JPEGmini for JPEG, TinyPNG for PNG, and ImageOptim for the Mac.

ImageMagick Sample Code for Converting Images to @2x, @3x, @4x Sizes

Sample code that uses ImageMagick's convert to emit @2x, @3x, and @4x variants of an image.

How to Use ImageMagick's mogrify Command for Batch Image Size Conversion

How to batch-resize images with ImageMagick's mogrify command, with a few common examples.