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more webp doc improvements

This commit is contained in:
John Cupitt 2016-05-03 09:36:49 +01:00
parent 1ae92bb15f
commit 37c716be89
2 changed files with 6 additions and 7 deletions
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2
TODO
View File

@ -1,5 +1,3 @@
- add "*" before each optional arg description
- I like the new int mask creator in reducev, can we use it in im_vips2imask()
as well?

11
libvips/foreign/foreign.c
View File

@ -2466,18 +2466,19 @@ vips_webpload_buffer( void *buf, size_t len, VipsImage **out, ... )
*
* Write an image to a file in WebP format.
*
* Use @Q to set the WebP quality factor. It has the range 0 - 100, with the
* By default, images are saved in lossy format, with
* @Q giving the WebP quality factor. It has the range 0 - 100, with the
* default 75.
*
* Use @preset to hint the image type to lossy compressor. The default is
* Use @preset to hint the image type to the lossy compressor. The default is
* #VIPS_FOREIGN_WEBP_PRESET_DEFAULT.
*
* Set @smart_subsample to enable high quality chroma subsampling.
*
* Use @alpha_q to set the quality for the alpha channel in lossy mode. It has
* the range 1 - 100, with the default 100.
*
* Set @lossless to enable lossless save.
* Set @lossless to use lossless compression, or combine @near_lossless
* with @Q 80, 60, 40 or 20 to apply increasing amounts of preprocessing
* which improves the near-lossless compression ratio by up to 50%.
*
* See also: vips_webpload(), vips_image_write_to_file().
*