If you work with images on the web, these image compression tools are extremely useful:
ImageOptim is free, open-source software that reduces images files sizes but preserve quality. It also removes metadata and its preferences allow for different levels of compression (lossless &/or lossy).
ImageAlpha (open source) reduces file sizes of 24-bit PNG files (including alpha transparency) by applying lossy compression and conversion to a more efficient PNG8+alpha format.
JPEGmini is a paid app that reduces image file size by up to 80% without compromising on quality.
To make images optimisation part of your automated build process1, combine these three tools and automate with the command line:
Optimage Lossy (visually lossless) and lossless optimizations, compression
SQUASH optimizes image file sizes, converts .jpegs from .psd files.
✑ Image Optimization by Estelle Weyl explains which is the best image format for each browser.
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