PHP:imagesetinterpolation()的用法_GD库图像处理函数

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imagesetinterpolation

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(PHP 5 >= 5.5.0)

imagesetinterpolation — Set the interpolation method

说明 bool imagesetinterpolation ( resource $image [, int $method = IMG_BILINEAR_FIXED ] )

Sets the interpolation method, setting an interpolation method affects the rendering of various functions in GD, such as the imagerotate() function.

参数

image PHP:imagesetinterpolation()的用法_GD库图像处理函数

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//Loadanimage$im=imagecreate(,);//BydefaultinterpolationisIMG_BILINEAR_FIXED,switch//tousethe'Mitchell'filter:imagesetinterpolation($im,IMG_MITCHELL);//Continuetoworkwith$im...?>

注释

Changing the interpolation method affects the following functions when rendering: imageaffine() imagerotate() imagescale()

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