diff --git a/doc/webp-container-spec.txt b/doc/webp-container-spec.txt index a123f2c1..5ee08e57 100644 --- a/doc/webp-container-spec.txt +++ b/doc/webp-container-spec.txt @@ -171,7 +171,7 @@ This layout SHOULD be used if the image requires _lossy_ encoding and does not require transparency or other advanced features provided by the extended format. Files with this layout are smaller and supported by older software. -Simple WebP (lossy) file header: +Simple WebP (lossy) file format: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 @@ -211,7 +211,7 @@ This layout SHOULD be used if the image requires _lossless_ encoding (with an optional transparency channel) and does not require advanced features provided by the extended format. -Simple WebP (lossless) file header: +Simple WebP (lossless) file format: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 @@ -393,10 +393,11 @@ Alpha bitstream: _Chunk Size_ - `1` bytes : Encoded alpha bitstream. -This optional chunk contains encoded alpha data for a single frame. -An image containing a 'VP8L' chunk SHOULD NOT contain this chunk. -**Rationale**: the transparency information of an image is already part of -the 'VP8L' chunk. +This optional chunk contains encoded alpha data for the image. An image +containing a 'VP8L' chunk SHOULD NOT contain this chunk. + +**Rationale**: The transparency information of the image is already part +of the 'VP8L' chunk. The alpha channel data is stored as uncompressed raw data (when compression method is '0') or compressed using the lossless format @@ -436,7 +437,7 @@ and [Simple file format (lossless)](#simple-file-format-lossless) respectively. #### Unknown Chunks -A file MAY contain other unknown chunks. Readers SHOULD be ignore these chunks. +A file MAY contain other unknown chunks. Readers SHOULD ignore these chunks. Writers SHOULD preserve them in their original order. Example file layouts