int
vips_reducev (
VipsImage* in,
VipsImage** out,
double vshrink,
...
)
Reduce in vertically by a float factor.
The pixels in out are interpolated with a 1D mask generated by kernel.
Set gap to speed up reducing by having vips_shrinkv() to shrink with a box filter first. The bigger gap, the closer the result to the fair resampling. The smaller gap, the faster resizing. The default value is 0.0 (no optimization).
This is a very low-level operation: see vips_resize() for a more convenient way to resize images.
This operation does not change xres or yres. The image resolution needs to be updated by the application.
This method is not directly available to language bindings.
Parametersout
Type: VipsImage
Output image.
The argument will be set by the function. The caller of the method takes ownership of the returned data, and is responsible for freeing it.vshrink
Type: double
Vertical reduce.
...
Type:
NULL-terminated list of optional named arguments.
Type: int
0 on success, -1 on error.
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