18
edits
Changes
m
fix typos
== Terminology ==
The "default image" is the image described by the standard `IDAT` chunks, and is the image that is displayed by decoders that do not support APNG.
The "canvas" is the area on the output device on which the frames are to be displayed. The contents of the canvas are not necessarily available to the decoder. As per the PNG Specification, if a `bKGD` chunk exists it may be used to fill the canvas if there is no preferrable background.
* Added `aCTL`, `fdAT`, `fcTL` chunk descriptions as per the latest png-list discussion
* Added section 4, "Interactions with other PNG chunks"; described global and local palettes andtransparency
* Changed `oFFs` chunk section to refer to more general chunks
* Updated `aDAT` description to indicate that all frames must either be in a single chunk, or that the firstchunk must have empty data.
* Added notice that each frame's region (x,y,width,height) must lie completely within the parent PNG canvas
* Changed dispose_op to render_op; added disposal description; added BLEND flag
* Changed delay_time to a delay numerator and denominator, for specifying delays that don't into integernumbers of milliseconds.
* Added note to clarify that palette animation is not supported.
