Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImage — Force all pixels above the threshold into white

Descrição

bool Imagick::whiteThresholdImage ( mixed $threshold )

Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

Parâmetros

threshold

Valor Retornado

Retorna TRUE em sucesso.

Histórico

Versão	Descrição
2.1.0	Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

add a note User Contributed Notes Imagick::whiteThresholdImage

elmer at web-axis dot net 30-Nov-2008 03:32


Here's a example of this function:





<?php


  $img = new Imagick();


  $img->readImage($image_file_name);


  $img->whiteThresholdImage('grey');


  $img->writeImage($thumb_file_name);


  $img->clear();


  $img->destroy();


?>

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