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revise resize docs

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This commit is contained in:
John Cupitt 2017-11-25 15:13:20 +00:00
parent 7db13412e5
commit ee4186ae8f
1 changed files with 4 additions and 5 deletions
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9
libvips/resample/resize.c
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@ -396,17 +396,16 @@ vips_resize_init( VipsResize *resize )
* image is block-shrunk with vips_shrink(),
* then the image is shrunk again to the
* target size with vips_reduce(). How much is done by vips_shrink() vs.
* vips_reduce() varies with the @kernel setting.
*
* This operation uses corner convention for doansampling, and centre
* convention for upsampling.
* vips_reduce() varies with the @kernel setting. Downsizing is done with
* corner convention.
*
* vips_resize() normally uses #VIPS_KERNEL_LANCZOS3 for the final reduce, you
* can change this with @kernel.
*
* When upsizing (@scale > 1), the operation uses vips_affine() with
* a #VipsInterpolate selected depending on @kernel. It will use
* #VipsInterpolateBicubic for #VIPS_KERNEL_CUBIC and above.
* #VipsInterpolateBicubic for #VIPS_KERNEL_CUBIC and above. It adds a
* 0.5 pixel displacement to the input pixels to get centre convention scaling.
*
* vips_resize() normally maintains the image aspect ratio. If you set
* @vscale, that factor is used for the vertical scale and @scale for the