Imagick::sparseColorImage
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Imagick::sparseColorImage — Interpolates colors
Description
public bool Imagick::sparseColorImage ( int $SPARSE_METHOD , array $arguments [, int $channel = Imagick::CHANNEL_DEFAULT ] ) Given the arguments array containing numeric values this method interpolates the colors found at those coordinates across the whole image using sparse_method. This method is available if Imagick has been compiled against ImageMagick version 6.4.5 or newer.
Parameters
SPARSE_METHOD
Refer to this list of sparse method constants
arguments
An array containing the coordinates. The array is in format array(1,1, 2,45)
CHANNEL
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. Defaults to Imagick::CHANNEL_DEFAULT. Refer to this list of channel constants
Return Values
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.
Examples
Example #1 SPARSECOLORMETHOD_BARYCENTRIC Imagick::sparseColorImage()
<?php
????function?renderImageBarycentric2()?{
????????$points?=?[
????????????[0.30,?0.10,?'red'],
????????????[0.10,?0.80,?'blue'],
????????????[0.70,?0.60,?'lime'],
????????????[0.80,?0.20,?'yellow'],
????????];
????????$imagick?=?createGradientImage(
????????????400,?400,
????????????$points,
????????????\Imagick::SPARSECOLORMETHOD_BARYCENTRIC
????????);
????????header("Content-Type:?image/png");
????????echo?$imagick->getImageBlob();
????}
?>Example #2 SPARSECOLORMETHOD_BILINEAR Imagick::sparseColorImage()
<?php
????function?renderImageBilinear()?{
????????$points?=?[[0.30,?0.10,?'red'],?[0.10,?0.80,?'blue'],?[0.70,?0.60,?'lime'],?[0.80,?0.20,?'yellow'],];
????????$imagick?=?createGradientImage(500,?500,?$points,?\Imagick::SPARSECOLORMETHOD_BILINEAR);
????????header("Content-Type:?image/png");
????????echo?$imagick->getImageBlob();
????}
?>Example #3 SPARSECOLORMETHOD_SPEPARDS Imagick::sparseColorImage()
<?php
????function?renderImageShepards()?{
????????$points?=?[
????????????[0.30,?0.10,?'red'],
????????????[0.10,?0.80,?'blue'],
????????????[0.70,?0.60,?'lime'],
????????????[0.80,?0.20,?'yellow'],
????????];
????????$imagick?=?createGradientImage(600,?600,?$points,?\Imagick::SPARSECOLORMETHOD_SPEPARDS);
????????header("Content-Type:?image/png");
????????echo?$imagick->getImageBlob();
????}
?>Example #4 SPARSECOLORMETHOD_VORONOI Imagick::sparseColorImage()
<?php
????function?renderImageVoronoi()?{
????????$points?=?[
????????????[0.30,?0.10,?'red'],
????????????[0.10,?0.80,?'blue'],
????????????[0.70,?0.60,?'lime'],
????????????[0.80,?0.20,?'yellow'],
????????];
????????$imagick?=?createGradientImage(500,?500,?$points,?\Imagick::SPARSECOLORMETHOD_VORONOI);
????????header("Content-Type:?image/png");
????????echo?$imagick->getImageBlob();
????}
?>Example #5 SPARSECOLORMETHOD_BARYCENTRIC Imagick::sparseColorImage()
<?php
????function?renderImageBarycentric()?{
????????$points?=?[
????????????[0,?0,?'skyblue'],
????????????[-1,?1,?'skyblue'],
????????????[1,?1,?'black'],
????????];
????????$imagick?=?createGradientImage(600,?200,?$points,?\Imagick::SPARSECOLORMETHOD_BARYCENTRIC);
????????header("Content-Type:?image/png");
????????echo?$imagick->getImageBlob();
????}
?>Example #6 createGradientImage is used by other examples. Imagick::sparseColorImage()
<?php
function?createGradientImage($width,?$height,?$colorPoints,?$sparseMethod,?$absolute?=?false)?{
????$imagick?=?new?\Imagick();
????$imagick->newImage($width,?$height,?"white");
????$imagick->setImageFormat("png");
????$barycentricPoints?=?array();
????foreach?($colorPoints?as?$colorPoint)?{
????????if?($absolute?==?true)?{
????????????$barycentricPoints[]?=?$colorPoint[0];
????????????$barycentricPoints[]?=?$colorPoint[1];
????????}
????????else?{
????????????$barycentricPoints[]?=?$colorPoint[0]?*?$width;
????????????$barycentricPoints[]?=?$colorPoint[1]?*?$height;
????????}
????????if?(is_string($colorPoint[2]))?{
????????????$imagickPixel?=?new?\ImagickPixel($colorPoint[2]);
????????}
????????else?if?($colorPoint[2]?instanceof?\ImagickPixel)?{
????????????$imagickPixel?=?$colorPoint[2];
????????}
????????else{
????????????$errorMessage?=?sprintf(
????????????????"Value?%s?is?neither?a?string?nor?an?ImagickPixel?class.?Cannot?use?as?a?color.",
????????????????$colorPoint[2]
????????????);
????????????throw?new?\InvalidArgumentException(
????????????????$errorMessage
????????????);
????????}
????????$red?=?$imagickPixel->getColorValue(\Imagick::COLOR_RED);
????????$green?=?$imagickPixel->getColorValue(\Imagick::COLOR_GREEN);
????????$blue?=?$imagickPixel->getColorValue(\Imagick::COLOR_BLUE);
????????$alpha?=?$imagickPixel->getColorValue(\Imagick::COLOR_ALPHA);
????????$barycentricPoints[]?=?$red;
????????$barycentricPoints[]?=?$green;
????????$barycentricPoints[]?=?$blue;
????????$barycentricPoints[]?=?$alpha;
????}
????$imagick->sparseColorImage($sparseMethod,?$barycentricPoints);
????return?$imagick;
}
?>← Imagick::solarizeImage
Imagick::spliceImage →
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