Imágenes
PHP Manual

imagefilter

(PHP 5)

imagefilter — Applies a filter to an image

Descripción

bool imagefilter ( resource $image , int $filtertype [, int $arg1 [, int $arg2 [, int $arg3 [, int $arg4 ]]]] )

imagefilter() applies the given filter filtertype on the image .

Lista de parámetros

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

filtertype

filtertype can be one of the following:

  • IMG_FILTER_NEGATE: Reverses all colors of the image.
  • IMG_FILTER_GRAYSCALE: Converts the image into grayscale.
  • IMG_FILTER_BRIGHTNESS: Changes the brightness of the image. Use arg1 to set the level of brightness.
  • IMG_FILTER_CONTRAST: Changes the contrast of the image. Use arg1 to set the level of contrast.
  • IMG_FILTER_COLORIZE: Like IMG_FILTER_GRAYSCALE, except you can specify the color. Use arg1 , arg2 and arg3 in the form of red , blue , green and arg4 for the alpha channel. The range for each color is 0 to 255.
  • IMG_FILTER_EDGEDETECT: Uses edge detection to highlight the edges in the image.
  • IMG_FILTER_EMBOSS: Embosses the image.
  • IMG_FILTER_GAUSSIAN_BLUR: Blurs the image using the Gaussian method.
  • IMG_FILTER_SELECTIVE_BLUR: Blurs the image.
  • IMG_FILTER_MEAN_REMOVAL: Uses mean removal to achieve a "sketchy" effect.
  • IMG_FILTER_SMOOTH: Makes the image smoother. Use arg1 to set the level of smoothness.

arg1

arg2

arg3

Valores retornados

Devuelve TRUE si todo se llevó a cabo correctamente, FALSE en caso de fallo.

Registro de cambios

Versión Descripción
5.2.5 Alpha support for IMG_FILTER_COLORIZE was added.

Ejemplos

Example#1 imagefilter() grayscale example

<?php
$im 
imagecreatefrompng('dave.png');
if (
$im && imagefilter($imIMG_FILTER_GRAYSCALE)) {
    echo 
'Image converted to grayscale.';
    
imagepng($im'dave.png');
} else {
    echo 
'Conversion to grayscale failed.';
}

imagedestroy($im);
?>

Example#2 imagefilter() brightness example

<?php
$im 
imagecreatefrompng('sean.png');
if (
$im && imagefilter($imIMG_FILTER_BRIGHTNESS20)) {
    echo 
'Image brightness changed.';
    
imagepng($im'sean.png');
} else {
    echo 
'Image brightness change failed.';
}

imagedestroy($im);
?>

Example#3 imagefilter() colorize example

<?php
$im 
imagecreatefrompng('philip.png');

/* R, G, B, so 0, 255, 0 is green */
if ($im && imagefilter($imIMG_FILTER_COLORIZE02550)) {
    echo 
'Image successfully shaded green.';
    
imagepng($im'philip.png');
} else {
    echo 
'Green shading failed.';
}

imagedestroy($im);
?>

Notes

Note: Esta funcion esta disponible solamente si PHP se ha compilado con la version de las bibliotecas GD distribuidas con PHP.

Ver también


Imágenes
PHP Manual