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better jpeg load/save API docs

This commit is contained in:
John Cupitt 2013-03-06 11:30:01 +00:00
parent a731805344
commit 592ace8514
1 changed files with 15 additions and 4 deletions
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19
libvips/foreign/foreign.c
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@ -1871,8 +1871,12 @@ vips_jpegload_buffer( void *buf, size_t len, VipsImage **out, ... )
*
* Any embedded ICC profiles are ignored: you always just get the RGB from
* the file. Instead, the embedded profile will be attached to the image as
* metadata. You need to use something like im_icc_import() to get CIE
* values from the file. Any EXIF data is also attached as VIPS metadata.
* @VIPS_META_ICC_NAME ("icc-profile-data"). You need to use something like
* vips_icc_import() to get CIE values from the file.
*
* EXIF metadata is attached as @VIPS_META_EXIF_NAME ("exif-data"), IPCT as
* @VIPS_META_IPCT_NAME ("ipct-data"), and XMP as VIPS_META_XMP_NAME
* ("xmp-data").
*
* The int metadata item "jpeg-multiscan" is set to the result of
* jpeg_has_multiple_scans(). Interlaced jpeg images need a large amount of
@ -1992,7 +1996,7 @@ vips_jpegsave_buffer( VipsImage *in, void **buf, size_t *len, ... )
*
* Use @Q to set the JPEG compression factor. Default 75.
*
* Use @profile to give the filename of a profile to be em,bedded in the JPEG.
* Use @profile to give the filename of a profile to be embedded in the JPEG.
* This does not affect the pixels which are written, just the way
* they are tagged. You can use the special string "none" to mean
* "don't attach a profile".
@ -2002,7 +2006,14 @@ vips_jpegsave_buffer( VipsImage *in, void **buf, size_t *len, ... )
* profile from the VIPS header will be attached.
*
* The image is automatically converted to RGB, Monochrome or CMYK before
* saving. Any metadata attached to the image is saved as EXIF, if possible.
* saving.
*
* EXIF data is constructed from @VIPS_META_EXIF_NAME ("exif-data"), then
* modified with any other related tags on the image before being written to
* the file.
*
* IPCT as @VIPS_META_IPCT_NAME ("ipct-data") and XMP as VIPS_META_XMP_NAME
* ("xmp-data") are coded and attached.
*
* See also: vips_jpegsave_buffer(), vips_image_write_file().
*