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Monday, August 29, 2011
PHP image color effects
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.
Note: This function is only available if PHP is compiled with the bundled version of the GD library.
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);
?>
User Contributed Notes
imagefilter
vdepizzol at hotmail dot com
04-Sep-2004 03:36
Examples using imagefilter():
<?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);
?>
/////////////////////////////
<?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);
?>
/////////////////////////////
<?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);
?>
kees at tweakers dot net
20-Jul-2004 08:26
From what i have been able to find from this function, it accepts the following arguments:
IMG_FILTER_NEGATE
IMG_FILTER_GRAYSCALE
IMG_FILTER_EDGEDETECT
IMG_FILTER_GAUSSIAN_BLUR
IMG_FILTER_SELECTIVE_BLUR
IMG_FILTER_EMBOSS
IMG_FILTER_MEAN_REMOVAL
The following arguments need one or more arguments.
IMG_FILTER_SMOOTH, -1924.124
IMG_FILTER_COLORIZE, -127.12, -127.98, 127
IMG_FILTER_CONTRAST, -90
IMG_FILTER_BRIGHTNESS, 98
I haven't tested them all, the names speak for themselves.
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