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imagefilter

(PHP 5)

imagefilter -- Applies a filter to an image

Description

bool imagefilter ( resource src_im, int filtertype [, int arg1 [, int arg2 [, int arg3]]] )

imagefilter() applies the filter filtertype to the image, using arg1, arg2 and arg3 where necessary.

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. 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.

Замечание: Эта функция доступна только в том случае, если PHP был скомпилирован со встроенной библиотекой GD.

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Пример 1. imagefilter() grayscale example


<?php

$im 
= 
imagecreatefrompng
(
'dave.png'
);

if (
$im 
&& 
imagefilter
(
$im
, 
IMG_FILTER_GRAYSCALE
)) {

    echo 
'Image converted to grayscale.'
;

    
imagepng
(
$im
, 
'dave.png'
);

} else {

    echo 
'Conversion to grayscale failed.'
;

}




imagedestroy
(
$im
);


?>

Пример 2. imagefilter() brightness example


<?php

$im 
= 
imagecreatefrompng
(
'sean.png'
);

if (
$im 
&& 
imagefilter
(
$im
, 
IMG_FILTER_BRIGHTNESS
, 
20
)) {

    echo 
'Image brightness changed.'
;

    
imagepng
(
$im
, 
'sean.png'
);

} else {

    echo 
'Image brightness change failed.'
;

}




imagedestroy
(
$im
);


?>

Пример 3. imagefilter() colorize example


<?php

$im 
= 
imagecreatefrompng
(
'philip.png'
);




/* R, G, B, so 0, 255, 0 is green */


if (
$im 
&& 
imagefilter
(
$im
, 
IMG_FILTER_COLORIZE
, 
0
, 
255
, 
0
)) {

    echo 
'Image successfully shaded green.'
;

    
imagepng
(
$im
, 
'philip.png'
);

} else {

    echo 
'Green shading failed.'
;

}




imagedestroy
(
$im
);


?>

Все функции PHP: