Photoshop Export As...

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  • Updated 11 months ago
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Hopefully this does not get too confusing.  AFAIK, an PNG-8 only supports binary alpha... in other words, there are only two levels of transparency, either opaque or transparent, whereas a PNG-24 supports the full spectrum of transparency (8-bits). 

However, using Export_Export As, and choosing the PNG type and selecting Smaller File (8-bit) option will shrink the file considerably and still preserve the complete alpha channel (all levels of transparency). How is this possible??  Would not 8-bit automatically preclude this?

I would have also expected that this file would show up in PS as an indexed color file, but it still says it is an 8-bit/channel RGB file.  However, windows properties shows the bit depth as 8-bit, not 32-bit as you would expect for an RGB-24 w/alpha channel.

Bottom line: I love that I can preserve 8-bit alpha and still get a tiny file, but how the heck is it possible?

Thanks for any insight... I must be missing something.


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Steve Brannen

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Posted 11 months ago

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