Imagick::paintTransparentImage

(PECL imagick 2.0.0)

Imagick::paintTransparentImage — Changes any pixel that matches color with the color defined by fill

Beschreibung

bool Imagick::paintTransparentImage ( mixed $target , float $alpha , float $fuzz )

Changes any pixel that matches color with the color defined by fill.

Parameter-Liste

target: Change this target color to specified opacity value within the image.
alpha: The level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.
fuzz: The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same.

Rückgabewerte

Liefert TRUE bei Erfolg.

Fehler/Exceptions

Wirft ImagickException bei Fehlern.

Changelog

Version	Beschreibung
2.1.0	Now allows a string representing the color as the first parameter. Previous versions allow only an ImagickPixel object.

Imagick::pingImage

Imagick::paintOpaqueImage

[edit] Last updated: Fri, 18 May 2012

add a note User Contributed Notes Imagick::paintTransparentImage

alain at ocarina dot fr 17-Oct-2011 02:14


The fuzz is just working well in a range of 0 to 65535.



I suggest you to try to move fuzz on a color spectrum image.



1/ Get a color spectrum ( Google Image has a lot )



2/ Try this code :



<?php



    function fuzzTest($source, $target, $fuzz) {



        // Loads image

        $im = new Imagick($source);



        // Resizes images to make them easily comparable

        $im->resizeImage(320, 240, Imagick::FILTER_LANCZOS, 1, true);

        

        // Apply fuzz

        $im->paintTransparentImage($im->getImagePixelColor(0, 0), 0, $fuzz);

        

         // Writes image

        $im->setImageFormat('png');

        $im->writeImage($target);

        $im->destroy();

         

        return true;

     }



     for ($i = 0; ($i <= 10); $i++) {

         fuzzTest('spectrum.png', "test_{$i}.png", (6553.5 * $i));

         echo '<img src="test_' . $i . '.png" />&nbsp;';

     }

 

 ?>

Anonymous 06-Mar-2009 08:11


Actually it does seem to work just not the way expected perhaps.



Looking at the fuzz option on ImageMagick's site (http://www.imagemagick.org/script/command-line-options.php#fuzz), "The distance can be in absolute intensity units or, by appending % as a percentage of the maximum possible intensity (255, 65535, or 4294967295)."



As it requires a float, the percentage value won't work so it actually one of the max intensity values.  In my case, the images I was working with seemed to have max intensity values of 65535.  So a fuzz of 6500, for roughly 10%, seemed to do the trick.



The part that might be problematic though is how do you determine the max intensity of a color/image?  Using a static 6500 would be fine until I would have to convert an image with a max intensity other than 65535.  If it's 255 it would wipe the entire image.  Or fall far short on the fuzz with the larger value.

paziek at gmail dot com 13-Feb-2009 06:53


Fuzz attribute doesn't work here.



#!/usr/bin/php

<?php



if(!isset($argv[1])) die("input file\n");



$im = new Imagick( $argv[1] );

$im->paintTransparentImage('rgb(246,241,230)', 0.0, 10);



file_put_contents('transparent_'.$argv[1], $im);

?>



Will "remove" only colors that match exactly rgb(246,241,230)

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