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webp-lossless-bitstream-spec: clarify some text

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These changes are based on editor comments in AUTH48:
https://datatracker.ietf.org/doc/draft-zern-webp/

Change-Id: I21f18bce43fde0e396b2cbc935d0ff90448f96c4
This commit is contained in:
James Zern 2024-09-10 18:04:24 -07:00
parent 0fd25d8406
commit a582b53b74
1 changed files with 4 additions and 4 deletions
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doc/webp-lossless-bitstream-spec.txt
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@ -436,8 +436,8 @@ should be interpreted as an 8-bit two's complement number (that is: uint8 range
The multiplication is to be done using more precision (with at least 16-bit The multiplication is to be done using more precision (with at least 16-bit
precision). The sign extension property of the shift operation does not matter precision). The sign extension property of the shift operation does not matter
here; only the lowest 8 bits are used from the result, and there the sign here; only the lowest 8 bits are used from the result, and in these bits, the
extension shifting and unsigned shifting are consistent with each other. sign extension shifting and unsigned shifting are consistent with each other.
Now, we describe the contents of color transform data so that decoding can apply Now, we describe the contents of color transform data so that decoding can apply
the inverse color transform and recover the original red and blue values. The the inverse color transform and recover the original red and blue values. The
@ -613,8 +613,8 @@ We use image data in five different roles:
1. Color transform image: Created by `ColorTransformElement` values 1. Color transform image: Created by `ColorTransformElement` values
(defined in ["Color Transform"](#color-transform)) for different blocks of (defined in ["Color Transform"](#color-transform)) for different blocks of
the image. the image.
1. Color indexing image: An array of size `color_table_size` (up to 256 ARGB 1. Color indexing image: An array of the size of `color_table_size` (up to
values) storing the metadata for the color indexing transform (see 256 ARGB values) that stores metadata for the color indexing transform (see
["Color Indexing Transform"](#color-indexing-transform)). ["Color Indexing Transform"](#color-indexing-transform)).
### 5.2 Encoding of Image Data ### 5.2 Encoding of Image Data