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more resize tuning

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This commit is contained in:
John Cupitt 2016-03-15 09:49:30 +00:00
parent ac4e5ce059
commit 45c3fea6ac
4 changed files with 11 additions and 9 deletions
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1
TODO
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@ -1,4 +1,3 @@
- try orc version of reducev? and shrinkv? maybe shrinkh?

3
libvips/convolution/gaussblur.c
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@ -67,6 +67,7 @@ G_DEFINE_TYPE( VipsGaussblur, vips_gaussblur, VIPS_TYPE_OPERATION );
static int
vips_gaussblur_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsGaussblur *gaussblur = (VipsGaussblur *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
@ -84,6 +85,8 @@ vips_gaussblur_build( VipsObject *object )
vips_matrixprint( t[0], NULL );
#endif /*DEBUG*/
vips_info( class->nickname, "gaussblur mask width %d", t[0]->Xsize );
if( vips_convsep( gaussblur->in, &t[1], t[0],
"precision", gaussblur->precision,
NULL ) )

10
libvips/resample/resize.c
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@ -124,12 +124,12 @@ vips_resize_build( VipsObject *object )
if( resize->scale > 1.0 )
int_hshrink = 1;
else
int_hshrink = VIPS_FLOOR( 1.0 / (resize->scale * 1.1) );
int_hshrink = VIPS_FLOOR( 1.0 / (resize->scale * 1.4) );
if( vips_object_argument_isset( object, "vscale" ) ) {
if( resize->vscale > 1.0 )
int_vshrink = 1;
else
int_vshrink = VIPS_FLOOR( 1.0 / (resize->vscale * 1.1) );
int_vshrink = VIPS_FLOOR( 1.0 / (resize->vscale * 1.4) );
}
else
int_vshrink = int_hshrink;
@ -210,7 +210,7 @@ vips_resize_build( VipsObject *object )
* Don't try to be clever for non-rectangular shrinks. We just
* consider the horizontal factor.
*/
sigma = (1.0 / hresidual) / 2.3;
sigma = (1.0 / hresidual) / 2.7;
anti_alias = hresidual < 0.9 && sigma > 0.45;
if( anti_alias ) {
vips_info( class->nickname, "anti-alias sigma %g", sigma );
@ -250,9 +250,9 @@ vips_resize_build( VipsObject *object )
vips_info( class->nickname, "final sharpen" );
t[4] = vips_image_new_matrixv( 3, 3,
-1.0, -1.0, -1.0,
-1.0, 32.0, -1.0,
-1.0, 24.0, -1.0,
-1.0, -1.0, -1.0 );
vips_image_set_double( t[4], "scale", 24 );
vips_image_set_double( t[4], "scale", 16 );
if( vips_conv( in, &t[5], t[4], NULL ) )
return( -1 );

6
tools/vipsthumbnail.c
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@ -233,11 +233,11 @@ thumbnail_find_jpegshrink( VipsImage *im )
* doing no further processing, which would make a 400-px version look
* very different from a 450-px version.
*/
if( shrink >= 8.5 )
if( shrink >= 9 )
return( 8 );
else if( shrink >= 4.5 )
else if( shrink >= 5 )
return( 4 );
else if( shrink >= 2.5 )
else if( shrink >= 3 )
return( 2 );
else
return( 1 );