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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