PHP 5.6.0beta1 released

Imagick::paintTransparentImage

(PECL imagick 2.0.0)

Imagick::paintTransparentImageChanges 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.

R├╝ckgabewerte

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.

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User Contributed Notes 2 notes

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alain at ocarina dot fr
2 years ago
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;';
     }
 
 
?>
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Anonymous
5 years ago
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.
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