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more tuning of vipsthumbnail 

leave at least a factor of two after shrink-on-load

helps hide aliasing
This commit is contained in:
John Cupitt 2016-04-02 20:09:30 +01:00
parent bc320f1090
commit 8fb146029c
1 changed files with 4 additions and 3 deletions
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7
tools/vipsthumbnail.c
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@ -76,7 +76,6 @@
* 28/2/16
* - add webp --shrink support
* 29/2/16
* - make more use of jpeg shrink-on-load now we've tuned vips_resize()
* - deprecate sharpen and interpolate
*/
@ -229,10 +228,12 @@ thumbnail_find_jpegshrink( VipsImage *im )
/* Shrink-on-load is a simple block shrink and will add quite a bit of
* extra sharpness to the image. We want to block shrink to a
* bit above our target, then vips_resize() to the final size.
*
* Leave at least a factor of two for the final resize step.
*/
if( shrink >= 10 )
if( shrink >= 16 )
return( 8 );
else if( shrink >= 6 )
else if( shrink >= 8 )
return( 4 );
else if( shrink >= 4 )
return( 2 );