ImagickPixel::destroy
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.
ImagickPixel::getColor
(PECL imagick 2.0.0)
ImagickPixel::getColor — Returns the color
Beschreibung
array ImagickPixel::getColor
([ bool
$normalized = false
] )Warnung
Diese Funktion ist bis jetzt nicht dokumentiert. Es steht nur die Liste der Argumente zur Verfügung.
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
Rückgabewerte
An array of channel values, each normalized if TRUE is given as param. Throws
ImagickPixelException on error.
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User Contributed Notes
ImagickPixel::getColor - [1 notes]
roman ¶
10 days ago