Imagick::evaluateImage

(PECL imagick 2.0.0)

Imagick::evaluateImage — Applies an expression to an image

Descrierea

Imagick::evaluateImage ( int $op , float $constant [, int $channel = Imagick::CHANNEL_DEFAULT ] ) : bool

Applys an arithmetic, relational, or logical expression to an image. Use these operators to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.

Parametri

op

The evaluation operator

constant

The value of the operator

channel

Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

Exemple

Example #1 Using Imagick::evaluateImage()

Using evaluateImage to reduce opacity in an image.

<?php
// Create new object with the image
$im = new Imagick('example-alpha.png');

// Reduce the alpha by 50%
$im->evaluateImage(Imagick::EVALUATE_DIVIDE, 2, Imagick::CHANNEL_ALPHA);

// Output the image
header("Content-Type: image/png");
echo $im;
?>

Valorile întoarse

Întoarce TRUE în caz de succes.

Erori/Excepții

Emite ImagickException în caz de eroare.