Imagick::paintTransparentImage

(PECL imagick 2, PECL imagick 3)

Imagick::paintTransparentImage — Cambia cualquier píxel que coincida con el color definido para el relleno

Advertencia

This function has been DEPRECATED as of Imagick 3.4.4. Relying on this function is highly discouraged.

Descripción

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

Cambia cualquier píxel que coincida con el color definido para el relleno.

Parámetros

target: Cambia este color objetivo por el valor de opacidad especificado dentro de la imagen.
alpha: El nivel de transparencia: 1.0 es completamente opaco y 0.0 es completamente transparente.
fuzz: El miembro enfoque de la imagen define cuánta tolerancia es aceptable para considerar que dos colores son el mismo.

Valores devueltos

Devuelve true en caso de éxito.

Errores/Excepciones

Lanza ImagickException en caso de error.

Historial de cambios

Versión	Descripción
PECL imagick 2.1.0	Ahora se permite que una cadena represente el color como primer parámetro. Versiones anteriores sólo permitían un objeto ImagickPixel.

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User Contributed Notes 3 notes

down

Anonymous ¶

15 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.

down

quickshiftin at gmail dot com ¶

10 years ago

Have a look at this thread on Stackoverflow for the answer regarding how to determine the max intensity of an image.

http://stackoverflow.com/questions/26239130/determine-max-possible-intensity-of-image/26240656#26240656

In short here is the code to make the $fuzz parameter behave more like you would expect (it now represents a percentage between 0-100). The $fuzz value should now be a float between 0 and 1.

class SaneImagick extends Imagick
{
    public function paintTransparentImage($target, $alpha, $fuzz)
    {
        $iQuantumDepth = pow(2, $this->getQuantumDepth()['quantumDepthLong']);
        return parent::paintTransparentImage($target, $alpha, $fuzz * $iQuantumDepth);
    }
}

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alain at ocarina dot fr ¶

13 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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