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Php imagefilter () function

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(PHP 5)

imagefilter --  Applies a filter to an image

Syntax

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);
?>

Php imagefilter Function syntax tag

imagefilter php code on this is provided for your study purpose, it will guide you to know how create and design a website using php. use it to practice and train your self online



Php imagefilter syntax tutorial

php tutorial guide and code design are for easy learning and programming. The code practice section provided at the top is for practising of this syntax. Use the code section up to practice your php programming online. Learning php is very easy, all you need is to use the examples on this site and practice them to perfect your skills.


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