'''PNG Photo Image extension for Tcl/Tk'''

[MAK] (08 Mar 2005)

This package implements support for loading and using PNG images with Tcl/Tk.  Although other extensions such as Img also add support for PNG images, I wanted something that was lightweight, did not depend on libpng, and which would be suitable for inclusion in the Tk core, as Tk does not currently support any image formats natively that take advantage of its internal support for alpha blending, and alpha antialiasing and drop shadows really go a long way toward beautifying Tk applications.

The package supports the full range of color types, channels and bit depths from 1 bit black & white to 16 bit per channel full color with alpha (64 bit RGBA) and interlacing.  Ancillary "chunks" such as gamma, color profile, and text fields are ignored, although they are checked at a minimum for correct CRC.

Currently tieing up packaging loose ends and should be available very shortly, but here's a teaser using [Tile] labels and Willem van Schaik's suite of PNG test images [http://www.schaik.com/pngsuite/pngsuite.html]:

[http://www.muonics.com/extimgs/tkpng.png]

Of course it looks the same as [Img], but its only dependency is on zlib, which already has a TIP.

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[Category Package] | [Category Graphics]