Method
VipsImagereduceh
Declaration [src]
int
vips_reduceh (
VipsImage* in,
VipsImage** out,
double hshrink,
...
)
Description [src]
Reduce in horizontally 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_shrinkh() 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.
::: tip “Optional arguments”
* kernel: VipsKernel, kernel to interpolate with
(default: VipsKernel)
* gap: gboolean, reducing gap to use (default: 0.0)
::: seealso
vips_shrink(), vips_resize(), vips_affine().
Parameters
out |
VipsImage |
Output image. |
|
| The argument will be set by the function. | |
| The instance takes ownership of the data, and is responsible for freeing it. | |
hshrink |
double |
Horizontal reduce. |
|
... |
none |
|