Php/docs/function.imagesetinterpolation
来自菜鸟教程
imagesetinterpolation
(PHP 5 >= 5.5.0, PHP 7)
imagesetinterpolation — Set the interpolation method
说明
imagesetinterpolation
( resource $image
[, int $method = IMG_BILINEAR_FIXED
] ) : bool
Sets the interpolation method, setting an interpolation method affects the rendering of various functions in GD, such as the imagerotate() function.
参数
image- 由图象创建函数(例如imagecreatetruecolor())返回的图象资源。
method- The interpolation method, which can be one of the following:
-
IMG_BELL: Bell filter. -
IMG_BESSEL: Bessel filter. -
IMG_BICUBIC: Bicubic interpolation. -
IMG_BICUBIC_FIXED: Fixed point implementation of the bicubic interpolation. -
IMG_BILINEAR_FIXED: Fixed point implementation of the bilinear interpolation (default (also on image creation)). -
IMG_BLACKMAN: Blackman window function. -
IMG_BOX: Box blur filter. -
IMG_BSPLINE: Spline interpolation. -
IMG_CATMULLROM: Cubic Hermite spline interpolation. -
IMG_GAUSSIAN: Gaussian function. -
IMG_GENERALIZED_CUBIC: Generalized cubic spline fractal interpolation. -
IMG_HERMITE: Hermite interpolation. -
IMG_HAMMING: Hamming filter. -
IMG_HANNING: Hanning filter. -
IMG_MITCHELL: Mitchell filter. -
IMG_POWER: Power interpolation. -
IMG_QUADRATIC: Inverse quadratic interpolation. -
IMG_SINC: Sinc function. -
IMG_NEAREST_NEIGHBOUR: Nearest neighbour interpolation. -
IMG_WEIGHTED4: Weighting filter. -
IMG_TRIANGLE: Triangle interpolation.
-
返回值
成功时返回 true， 或者在失败时返回 false。
范例
Example #1 imagesetinterpolation() example
<?php// Load an image$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 ...?>
注释
Changing the interpolation method affects the following functions when rendering:
