ChemAxon products are able to export PNG (Portable Network Graphics) image files. The PngExport module recognizes the common image export options, and the following special options:

Codename	Explanations
`b...`	Bits/pixel, valid values, and their meanings: 1 - Black and white colors defined with a palette, image data contains 1 bit/pixel 2 - Black, white, light, and dark gray colors defined with a palette, image data contains 2 bits/pixel 4 - 16 base colors defined with a palette, image data contains 2 bits/pixel 8 - 256 colors defined with a palette, image data contains 2 bits/pixel 24 - image data contains 38 bits/pixel RGB colors, without palette. 32 - image data contains 38 bits/pixel RGB colors, and 8 bits/pixel alpha channel, without palette.
`nosource`	Omits saving of molecule source into image as comment.
~~`Z...`~~	Deprecated. Images are being exported with maximum compression level.

Examples:

`png`	Default settings: 200x200 pixels, white background (or black in 3D), maximum compression.
`png:w100,b32,#ffffff00`	100x100 PNG with yellow background, alpha channel is encoded.

Reference

PNG Home Site (http://www.libpng.org/pub/png/)

PngExport uses the default Javax ImageIO package to export PNG images.

Codename: png