ImagickPixel::getColor

(PECL imagick 2.0.0)

ImagickPixel::getColorReturns the color

Beschreibung

array ImagickPixel::getColor ([ bool $normalized = false ] )

Returns the color described by the ImagickPixel object, as an array. If the color has an opacity channel set, this is provided as a fourth value in the list.

Parameter-Liste

normalized

Normalize the color values

R├╝ckgabewerte

An array of channel values, each normalized if TRUE is given as param. Throws ImagickPixelException on error.

Beispiele

Beispiel #1 Basic Imagick::getColor() usage

<?php

//Create an ImagickPixel with the predefined color 'brown'
$color = new ImagickPixel('brown');

//Set the color to have an alpha of 25%
$color->setColorValue(Imagick::COLOR_ALPHA64 256.0);

$colorInfo $color->getColor();

echo 
"Standard values".PHP_EOL;
print_r($colorInfo);

$colorInfo $color->getColor(true);

echo 
"Normalized values:".PHP_EOL;
print_r($colorInfo);

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

Standard values
Array
(
    [r] => 165
    [g] => 42
    [b] => 42
    [a] => 0
)
Normalized values:
Array
(
    [r] => 0.64705882352941
    [g] => 0.16470588235294
    [b] => 0.16470588235294
    [a] => 0.25000381475547
)
    

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User Contributed Notes 1 note

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roman
11 months ago
In case you use default un-normalized getColor value the alpha value will always be either 0 or 1.

If you want to use real full-range 0-1 alpha channel on your 24bit transparent images use the alpha value from the normalized one, even if you use the rest of unnormalized data.

To copy a 24bit png with real alpha transparency, you would have to do this:
<?php

$im
=new Imagick( 'image.png' );
$iterator=$im->getPixelIterator();
foreach (
$iterator as $row=>$pixels) {
    foreach (
$pixels as $column => $pixel ){
       
$un_color=$pixel->getColor(); //unnormalized color
       
$nor_color=$pixel->getColor(true); //normalized color
       
$pixel->setColor('rgba('.$un_color['r'].','.$un_color['g'].','.$un_color['b'].','.$nor_color['a'].')');
    }
}
?>

If you use 'a' (alpha) value from the unnormalized color there will only be binary transparency.
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