variable interpolation Post: 54226

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LEARN ABOUT PHP

imagesetinterpolation

IMAGESETINTERPOLATION(3)						 1						  IMAGESETINTERPOLATION(3)

imagesetinterpolation - Set the interpolation method

SYNOPSIS

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

DESCRIPTION

	Sets  the  interpolation  method,  setting  an interpolation method affects the rendering of various functions in GD, such as the imagero-
       tate(3) function.

PARAMETERS

	      o $
		image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).

	      o $method
		- The interpolation method, which can be one of the following:

		     o IMG_BELL: Bell filter.

		     o IMG_BESSEL: Bessel filter.

		     o IMG_BICUBIC: Bicubic interpolation.

		     o IMG_BICUBIC_FIXED: Fixed point implementation of the bicubic interpolation.

		     o IMG_BILINEAR_FIXED: Fixed point implementation of the bilinear interpolation ( default (also on image creation)).

		     o IMG_BLACKMAN: Blackman window function.

		     o IMG_BOX: Box blur filter.

		     o IMG_BSPLINE: Spline interpolation.

		     o IMG_CATMULLROM: Cubic Hermite spline interpolation.

		     o IMG_GAUSSIAN: Gaussian function.

		     o IMG_GENERALIZED_CUBIC: Generalized cubic spline fractal interpolation.

		     o IMG_HERMITE: Hermite interpolation.

		     o IMG_HAMMING: Hamming filter.

		     o IMG_HANNING: Hanning filter.

		     o IMG_MITCHELL: Mitchell filter.

		     o IMG_POWER: Power interpolation.

		     o IMG_QUADRATIC: Inverse quadratic interpolation.

		     o IMG_SINC: Sinc function.

		     o IMG_NEAREST_NEIGHBOUR: Nearest neighbour interpolation.

		     o IMG_WEIGHTED4: Weighting filter.

		     o IMG_TRIANGLE: Triangle interpolation.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      imagesetinterpolation(3) 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:

	      oimageaffine(3)

	      oimagerotate(3)

	      oimagescale(3)

PHP Documentation Group 												  IMAGESETINTERPOLATION(3)