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| author | James Zern <jzern@google.com> | 2023-05-12 15:08:44 -0700 |
|---|---|---|
| committer | James Zern <jzern@google.com> | 2023-05-12 15:10:30 -0700 |
| commit | 17e0ef1da57718640c099bac472b2d49a60a0dea (patch) | |
| tree | 1e8c2e295a102f4c26d1ddb16cc81a687bd3fb90 | |
| parent | ed274371604e3321fbe9dcf9dc31dc262f8f34b1 (diff) | |
| download | libwebp-17e0ef1da57718640c099bac472b2d49a60a0dea.tar.gz | |
webp-lossless-bitstream-spec: remove use of 'dynamics'
when bit width or precision are meant.
Change-Id: I89c2279e99b02c3e8a3bf39860364d2ce6d909c8
| -rw-r--r-- | doc/webp-lossless-bitstream-spec.txt | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/doc/webp-lossless-bitstream-spec.txt b/doc/webp-lossless-bitstream-spec.txt index 8815c70e..3010fd9f 100644 --- a/doc/webp-lossless-bitstream-spec.txt +++ b/doc/webp-lossless-bitstream-spec.txt @@ -162,8 +162,8 @@ int image_width = ReadBits(14) + 1; int image_height = ReadBits(14) + 1; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -The 14-bit dynamics for image size limit the maximum size of a WebP lossless -image to 16384✕16384 pixels. +The 14-bit precision for image width and height limits the maximum size of a +WebP lossless image to 16384✕16384 pixels. The alpha_is_used bit is a hint only, and should not impact decoding. It should be set to 0 when all alpha values are 255 in the picture, and 1 otherwise. @@ -428,7 +428,7 @@ performed using 8-bit two's complement (that is: uint8 range \[128..255\] is mapped to the \[-128..-1\] range of its converted int8 value). The multiplication is to be done using more precision (with at least 16-bit -dynamics). 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 extension shifting and unsigned shifting are consistent with each other. @@ -489,9 +489,8 @@ void AddGreenToBlueAndRed(uint8 green, uint8 *red, uint8 *blue) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This transform is redundant as it can be modeled using the color transform, but -it is still often useful. Since it can extend the dynamics of the color -transform and there is no additional data here, the subtract green transform can -be coded using fewer bits than a full-blown color transform. +since there is no additional data here, the subtract green transform can be +coded using fewer bits than a full-blown color transform. ### 4.4 Color Indexing Transform |