note mozjpeg settings in docs

see https://github.com/libvips/libvips/issues/1422
2019-09-11 09:29:43 +01:00 · 2019-09-11 09:29:43 +01:00 · 0b57e2cdc2
commit 0b57e2cdc2
parent 7b2729adfa
1 changed files with 3 additions and 0 deletions
--- a/libvips/foreign/jpegsave.c
+++ b/libvips/foreign/jpegsave.c
@ -496,6 +496,9 @@ vips_foreign_save_jpeg_mime_init( VipsForeignSaveJpegMime *mime )
 * Tables 5-7 are based on older research papers, but generally achieve worse
 * compression ratios and/or quality than 2 or 4.
 *
+ * For maximum compression with mozjpeg, a useful set of options is `strip, 
+ * optimize-coding, interlace, optimize-scans, trellis-quant, quant_table=3`.
+ *
 * The image is automatically converted to RGB, Monochrome or CMYK before 
 * saving. 
 *