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Imagick::paintTransparentImage

(PECL imagick 2, PECL imagick 3)

Imagick::paintTransparentImageAltera qualquer pixel que corresponda à cor definida pelo preenchimento

Aviso

Esta função tornou-se DEFASADA a partir da Imagick 3.4.4. O uso desta função é fortemente desencorajado.

Descrição

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

Altera qualquer pixel que corresponda à cor definida pelo preenchimento.

Parâmetros

target

Altere esta cor de destino para o valor de opacidade especificado na imagem.

alpha

O nível de transparência: 1.0 é totalmente opaco e 0.0 é totalmente transparente.

fuzz

O membro fuzz da imagem define quanta tolerância é aceitável para considerar duas cores iguais.

Valor Retornado

Retorna true em caso de sucesso.

Erros/Exceções

Lança uma exceção ImagickException em caso de erro.

Registro de Alterações

Versão Descrição
PECL imagick 2.1.0 Agora permite uma string representando a cor como primeiro parâmetro. As versões anteriores permitiam apenas um objeto ImagickPixel.

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Notas Enviadas por Usuários (em inglês) 3 notes

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1
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.
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0
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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0
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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