imagesetinterpolation
Set the interpolation method
Description
bool imagesetinterpolation(GdImage $image
, int $method
= IMG_BILINEAR_FIXED
)
Parameters
-
image
-
A GdImage object, returned by one of the image creation functions,
such as imagecreatetruecolor.
-
method
-
The interpolation method, which can be one of the following:
-
IMG_BELL
: Bell filter.
-
IMG_BESSEL
: Bessel filter.
-
IMG_BICUBIC
: Bicubic interpolation.
-
IMG_BICUBIC_FIXED
: Fixed point implementation of the bicubic interpolation.
-
IMG_BILINEAR_FIXED
: Fixed point implementation of the bilinear interpolation (default (also on image creation)
).
-
IMG_BLACKMAN
: Blackman window function.
-
IMG_BOX
: Box blur filter.
-
IMG_BSPLINE
: Spline interpolation.
-
IMG_CATMULLROM
: Cubic Hermite spline interpolation.
-
IMG_GAUSSIAN
: Gaussian function.
-
IMG_GENERALIZED_CUBIC
: Generalized cubic spline fractal interpolation.
-
IMG_HERMITE
: Hermite interpolation.
-
IMG_HAMMING
: Hamming filter.
-
IMG_HANNING
: Hanning filter.
-
IMG_MITCHELL
: Mitchell filter.
-
IMG_POWER
: Power interpolation.
-
IMG_QUADRATIC
: Inverse quadratic interpolation.
-
IMG_SINC
: Sinc function.
-
IMG_NEAREST_NEIGHBOUR
: Nearest neighbour interpolation.
-
IMG_WEIGHTED4
: Weighting filter.
-
IMG_TRIANGLE
: Triangle interpolation.
Return Values
Returns true
on success or false
on failure.
Examples
Example #1 imagesetinterpolation example
<?php
// Load an image
$im = imagecreate(500, 500);
// By default interpolation is IMG_BILINEAR_FIXED, switch
// to use the 'Mitchell' filter:
imagesetinterpolation($im, IMG_MITCHELL);
// Continue to work with $im ...
?>
Notes
Changing the interpolation method affects the following functions
when rendering: