Mathis/sharp
1
0
Fork 0
mirror of https://github.com/lovell/sharp.git synced 2025-12-19 07:15:08 +01:00
Code Issues Packages Projects Releases Wiki Activity

Add chroma subsampling options for JPEG output

Browse Source
This commit is contained in:
Lovell Fuller
2015-02-13 09:41:42 +00:00
parent 0e91ca90d6
commit 1f7e80e581
7 changed files with 69 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
README.md
View File

@@ -438,6 +438,15 @@ Include all metadata (EXIF, XMP, IPTC) from the input image in the output image.
The default behaviour is to strip all metadata and convert to the device-independent sRGB colour space.
#### withoutChromaSubsampling()
Disable the use of [chroma subsampling](http://en.wikipedia.org/wiki/Chroma_subsampling) with JPEG output (4:4:4).
This can improve colour representation at higher quality settings (90+),
but usually increases output file size and typically reduces performance by 25%.
The default behaviour is to use chroma subsampling (4:2:0).
#### compressionLevel(compressionLevel)
An advanced setting for the _zlib_ compression level of the lossless PNG output format. The default level is `6`.