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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.

> 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); ?>`

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