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APNG Specification

326 bytes removed, 02:17, 23 March 2007
OVER color type restriction does not take into account possibility of tRNS chunk, and doesn't serve any useful purpose anyway
If `blend_op` is APNG_BLEND_OP_SOURCE all color components of the frame, including alpha, overwrite the current contents of the frame's output buffer region. If `blend_op` is APNG_BLEND_OP_OVER the frame should be composited onto the output buffer based on its alpha, using a simple OVER operation as described in the "Alpha Channel Processing" section of the PNG specification [PNG-1.2]. Note that Variation 2 of the sample code is applicable.
 
APNG_BLEND_OP_OVER is not valid for color types 0 (greyscale without alpha) or 2 (truecolor without alpha). It is valid for type 3 (indexed) images; however, the resulting pixel values may not be present in the specified palette. It is always valid for type 4 (greyscale with alpha) and type 6 (truecolor with alpha) images.
The `fcTL` chunk corresponding to the placeholder image has additional restrictions, if it exists:
Herbyderby
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