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Imagick::sparseColorImage — Interpolates colors
$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.
SPARSE_METHODRefer to this list of sparse method constants
argumentsAn 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
Returns TRUE on success.
Throws ImagickException on error.
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;
}
?>