Method
VipsImageflatten
Declaration [src]
int
vips_flatten (
VipsImage* in,
VipsImage** out,
...
)
Description [src]
Optional arguments:
background:VipsArrayDoublecolour for new pixelsmax_alpha: %gdouble, maximum value for alpha
Take the last band of in as an alpha and use it to blend the
remaining channels with background.
The alpha channel is 0 - max_alpha, where max_alpha means 100% image
and 0 means 100% background. background defaults to zero (black).
max_alpha has the default value 255, or 65535 for images tagged as
VIPS_INTERPRETATION_RGB16 or
VIPS_INTERPRETATION_GREY16.
Useful for flattening PNG images to RGB.
Non-complex images only.
See also: vips_premultiply(), vips_pngload().
This method is not directly available to language bindings.
Parameters
out-
Type:
VipsImageOutput 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. ...-
Type:
NULL-terminated list of optional named arguments.