As some tools are PNG-specific, while others only optimize DEFLATE, in general one must use a combination of 2 tools in sequence for optimal compression: one which optimizes filters (and removes ancillary chunks), and one which optimizes DEFLATE. Most commonly, OptiPNG is used for the first (non-DEFLATE) step, and either of AdvanceCOMP or PNGOUT is used for the DEFLATE step.
The case of the second letter indicates if the chunk is "public" (either in the specification or the registry of special purpose public chunks) or "private" (not standardised). Uppercase is public and lowercase is private. This ensures that public and private chunk names can never conflict with each other (although two private chunk names could conflict).
Popular graphics programs which support the PNG format include Adobe Photoshop, Corel's Photo-Paint and Paint Shop Pro, the GIMP, GraphicConverter, Helicon Filter, Inkscape, IrfanView, Pixel image editor, Paint.NET and Xara. Some programs bundled with popular operating systems which support PNG include Microsoft's Paint and Apple's iPhoto and Preview, with the GIMP also often being bundled with popular Linux distributions.
Wrapper tools that simplify this workflow include: ImageOptim, a GUI front-end for Mac OS X; Kashmir Web Optimizer- GUI front-end for Windows; imgopt, a command-line shell script that also losslessly optimizes JPEG images; and Smush.it, an image-optimizing web service.
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