PHP image color effects

imagefilter <br /> <br />(PHP 5) <br />imagefilter -- Applies a filter to an image <br />Description <br />bool imagefilter ( resource src_im, int filtertype [, int arg1 [, int arg2 [, int arg3]]] ) <br /> <br />imagefilter() applies the filter filtertype to the image, using arg1, arg2 and arg3 where necessary. <br /> <br />filtertype can be one of the following: <br /> <br /> * <br /> <br /> IMG_FILTER_NEGATE: Reverses all colors of the image. <br /> * <br /> <br /> IMG_FILTER_GRAYSCALE: Converts the image into grayscale. <br /> * <br /> <br /> IMG_FILTER_BRIGHTNESS: Changes the brightness of the image. Use arg1 to set the level of brightness. <br /> * <br /> <br /> IMG_FILTER_CONTRAST: Changes the contrast of the image. Use arg1 to set the level of contrast. <br /> * <br /> <br /> 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. <br /> * <br /> <br /> IMG_FILTER_EDGEDETECT: Uses edge detection to highlight the edges in the image. <br /> * <br /> <br /> IMG_FILTER_EMBOSS: Embosses the image. <br /> * <br /> <br /> IMG_FILTER_GAUSSIAN_BLUR: Blurs the image using the Gaussian method. <br /> * <br /> <br /> IMG_FILTER_SELECTIVE_BLUR: Blurs the image. <br /> * <br /> <br /> IMG_FILTER_MEAN_REMOVAL: Uses mean removal to achieve a "sketchy" effect. <br /> * <br /> <br /> IMG_FILTER_SMOOTH: Makes the image smoother. Use arg1 to set the level of smoothness. <br /> <br /> Note: This function is only available if PHP is compiled with the bundled version of the GD library. <br /> <br />Returns TRUE on success or FALSE on failure. <br /> <br />Example 1. imagefilter() grayscale example <br /><?php <br />$im = imagecreatefrompng('dave.png'); <br />if ($im && imagefilter($im, IMG_FILTER_GRAYSCALE)) { <br /> echo 'Image converted to grayscale.'; <br /> imagepng($im, 'dave.png'); <br />} else { <br /> echo 'Conversion to grayscale failed.'; <br />} <br /> <br />imagedestroy($im); <br />?> <br /> <br />Example 2. imagefilter() brightness example <br /><?php <br />$im = imagecreatefrompng('sean.png'); <br />if ($im && imagefilter($im, IMG_FILTER_BRIGHTNESS, 20)) { <br /> echo 'Image brightness changed.'; <br /> imagepng($im, 'sean.png'); <br />} else { <br /> echo 'Image brightness change failed.'; <br />} <br /> <br />imagedestroy($im); <br />?> <br /> <br />Example 3. imagefilter() colorize example <br /><?php <br />$im = imagecreatefrompng('philip.png'); <br /> <br />/* R, G, B, so 0, 255, 0 is green */ <br />if ($im && imagefilter($im, IMG_FILTER_COLORIZE, 0, 255, 0)) { <br /> echo 'Image successfully shaded green.'; <br /> imagepng($im, 'philip.png'); <br />} else { <br /> echo 'Green shading failed.'; <br />} <br /> <br />imagedestroy($im); <br />?> <br /> <br /> <br />User Contributed Notes <br />imagefilter <br />vdepizzol at hotmail dot com <br />04-Sep-2004 03:36 <br />Examples using imagefilter(): <br /> <br /><?php <br />$im = imagecreatefrompng('dave.png'); <br />if ($im && imagefilter($im, IMG_FILTER_GRAYSCALE)) { <br /> echo 'Image converted to grayscale.'; <br /> imagepng($im, 'dave.png'); <br />} else { <br /> echo 'Conversion to grayscale failed.'; <br />} <br /> <br />imagedestroy($im); <br />?> <br /> <br />///////////////////////////// <br /> <br /><?php <br />$im = imagecreatefrompng('sean.png'); <br />if ($im && imagefilter($im, IMG_FILTER_BRIGHTNESS, 20)) { <br /> echo 'Image brightness changed.'; <br /> imagepng($im, 'sean.png'); <br />} else { <br /> echo 'Image brightness change failed.'; <br />} <br /> <br />imagedestroy($im); <br />?> <br /> <br />///////////////////////////// <br /> <br /><?php <br />$im = imagecreatefrompng('philip.png'); <br /> <br />/* R, G, B, so 0, 255, 0 is green */ <br />if ($im && imagefilter($im, IMG_FILTER_COLORIZE, 0, 255, 0)) { <br /> echo 'Image successfully shaded green.'; <br /> imagepng($im, 'philip.png'); <br />} else { <br /> echo 'Green shading failed.'; <br />} <br /> <br />imagedestroy($im); <br />?> <br />kees at tweakers dot net <br />20-Jul-2004 08:26 <br />From what i have been able to find from this function, it accepts the following arguments: <br /> IMG_FILTER_NEGATE <br /> IMG_FILTER_GRAYSCALE <br /> IMG_FILTER_EDGEDETECT <br /> IMG_FILTER_GAUSSIAN_BLUR <br /> IMG_FILTER_SELECTIVE_BLUR <br /> IMG_FILTER_EMBOSS <br /> IMG_FILTER_MEAN_REMOVAL <br /> <br />The following arguments need one or more arguments. <br /> IMG_FILTER_SMOOTH, -1924.124 <br /> IMG_FILTER_COLORIZE, -127.12, -127.98, 127 <br /> IMG_FILTER_CONTRAST, -90 <br /> IMG_FILTER_BRIGHTNESS, 98 <br /> <br />I haven't tested them all, the names speak for themselves. <br /> <br /> <br />