generic-library/webp
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Doc: container spec text tweaks

Browse Source 
Change-Id: I8e29f1c814b0c8f6aa268562d8653989caaf281d
modified:   doc/webp-container-spec.txt
This commit is contained in:
Lou Quillio 2012-07-18 12:16:51 -07:00
parent c2416c9b61
commit 4e2e0a8cac
1 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
doc/webp-container-spec.txt
View File

@ -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