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(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.

Returns TRUE on success or FALSE on failure.

Example 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);
?>

Example 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);
?>

Example 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);
?>