PNG Optimization
Im Smashing Magazine stellt Sergey Chikuyonok einige PNG Optimization Tipps vor.
Z.B:
Photoshop can’t save grayscale PNGs, so you would have to use OptiPNG after saving black-and-white images, like this:
optipng -o5 bw-image.pngGrayscale images takes much less space than RGBs, because each pixel described with only one byte, not three.