PNG (Portable Network Graphics) Specification, Tenth Draft
Revision date: 5 May, 1995
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PNG itself is strictly a single-image format. However, it may be
necessary to store multiple images within one file; for example, this
is needed to convert some GIF files. For this purpose, a multi-image
format will be defined in the near future. PNG decoders will not be
required to support the multi-image extension.
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