Guymon

8bit RGBA-PNGs

Mit ImageAlpha lassen sich 8bit RGBA-PNGs erzeugen.

ImageAlpha is a GUI for pngnq and pngquant. It allows you to easily generate paletted PNG images with full alpha channel and test how it will look against different backgrounds.

Dadurch werden PNGs nicht nur kleiner sondern, wie ich im Webstandards Magazin 03/09 gelesen habe: Im IE werden bei diesen PNGs halb transparente Flächen einfach durch Volltransparenzen ersetzt. Was manchmal ja sehr nützlich sein kann.

Performance: punypng

Mit punypng gibt es ein weiteres Tool um Bilder zu optimieren.

Mehr Infos gibt es im Gracepoint After Five Blog:

• Fully supports for PNG, .GIF, .JPG
• Clear affordances for # of bytes saved (as well as being pretty bar graphs)
• JPEG Compression — punypng doesn’t leave JPEGs out in the cold. JPEGs are analyzed to see if a compressed PNG format is better (ex: JPEGs with heavy solid areas benefit from this). But if not, don’t despair, punypng is backed with jpeg-tran and jpegoptim for further JPEG optimzation.
• “Fire-and-forget” batch processing: You can upload up to 50 files in a single session. Optimized versions are clearly labeled, and if no further optimization can be made to the uploaded file, you get the original back untouched. After you upload a batch, you can go ahead and upload another batch without having to reload the page.
• Download batch jobs as a single time-stamped ZIP.
• See the changelog for future updates

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.png

Grayscale images takes much less space than RGBs, because each pixel described with only one byte, not three.

PNG tools on the Mac

Für Freunde der Kommandozeile: Stoyan Stefanov zeigt man diverse PNG Tools auf dem Mac installiert, u.a AdvPng, OptiPng, PNGout und PngRewrite

Bilder Optimierung

Six Revisions stellt 8 Tools zur Bildoptimierung vor.

Was ich ausser den Windows Tools nicht kannte ist das Photoshop Plugin SuperPNG. Mal testen.