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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:

CodenameExplanations
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 3*8 bits/pixel RGB colors, without palette.
  • 32 - image data contains 3*8 bits/pixel RGB colors, and 8 bits/pixel alpha channel, without palette.

Default value:24

nosource
Omits saving of molecule source into image as comment.
Z...
Deprecated. Images are being exported with maximum compression level.

Examples:

pngDefault settings: 200x200 pixels, white background (or black in 3D), maximum compression.
png:w100,b32,#ffffff00100x100 PNG with yellow background, alpha channel is encoded.

Reference

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

Codepng