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2.1.7 [W3C-PNG] Section 11.3.3.4, sBIT Significant bits

V0008:

The specification states:

11.3.3.4 sBIT Significant bits

Each depth specified in sBIT shall be greater than zero and less than or equal to 
the sample depth (which is 8 for indexed-colour images, and the bit depth given in 
IHDR for other colour types). Note that sBIT does not provide a sample depth for 
the alpha channel that is implied by a tRNS chunk; in that case, all of the sample 
bits of the alpha channel are to be treated as significant. If the sBIT chunk is 
not present, then all of the sample bits of all channels are to be treated as 
significant.

All Document Modes (All Versions)

The sBIT chunk is not supported.

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