(PHP 5 >= 5.5.0, PHP 7, PHP 8)
imagesetinterpolation — Set the interpolation method
Sets the interpolation method, setting an interpolation method affects the rendering of various functions in GD, such as the imagerotate() function.
image由圖象創(chuàng )建函數(例如imagecreatetruecolor())返回的 GdImage 對象。
methodThe 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.
成功時(shí)返回 true， 或者在失敗時(shí)返回 false。
| 版本 | 說(shuō)明 |
|---|---|
| 8.0.0 |
image expects a GdImage
instance now; previously, a resource was expected.
|
示例 #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 ...
?>
Changing the interpolation method affects the following functions when rendering: