imagesetinterpolation()

(PHP 5 >= 5.5.0, PHP 7)

Set the interpolation method

说明

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

参数

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

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

imagesetinterpolation() example

注释

Changing the interpolation method affects the following functions when rendering:

• imageaffine()
• imagerotate()

Setting the interpolation does not carry through to any images created by imageaffine() or imagerotate(). It defaults to IMG_BILINEAR_FIXED and would need to be set on each generated image as required.

Setting the interpolation to IMG_NEAREST_NEIGHBOUR can help to preserve details and prevent sampling issues when rotating an image at 90 degree increments, including when rotating clockwise. 

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