imagefilter

(PHP 5, PHP 7)

imagefilterApplies a filter to an image

Descrierea

imagefilter ( resource $image , int $filtertype [, int $arg1 [, int $arg2 [, int $arg3 [, int $arg4 ]]]] ) : bool

imagefilter() applies the given filter filtertype on the image.

Parametri

image

O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().

filtertype

filtertype can be one of the following:

  • IMG_FILTER_NEGATE: Reverses all colors of the image.
  • IMG_FILTER_GRAYSCALE: Converts the image into grayscale by changing the red, green and blue components to their weighted sum using the same coefficients as the REC.601 luma (Y') calculation. The alpha components are retained. For palette images the result may differ due to palette limitations.
  • IMG_FILTER_BRIGHTNESS: Changes the brightness of the image. Use arg1 to set the level of brightness. The range for the brightness is -255 to 255.
  • 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, green, blue and arg4 for the alpha channel. 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.
  • IMG_FILTER_PIXELATE: Applies pixelation effect to the image, use arg1 to set the block size and arg2 to set the pixelation effect mode.

arg1

  • IMG_FILTER_BRIGHTNESS: Brightness level.
  • IMG_FILTER_CONTRAST: Contrast level.
  • IMG_FILTER_COLORIZE: Valoarea componentei roșii.
  • IMG_FILTER_SMOOTH: Smoothness level.
  • IMG_FILTER_PIXELATE: Block size in pixels.

arg2

  • IMG_FILTER_COLORIZE: Valoarea componentei verzi.
  • IMG_FILTER_PIXELATE: Whether to use advanced pixelation effect or not (defaults to FALSE).

arg3

  • IMG_FILTER_COLORIZE: Valoarea componentei albastre.

arg4

  • IMG_FILTER_COLORIZE: Alpha channel, A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.

Valorile întoarse

Întoarce valoarea TRUE în cazul succesului sau FALSE în cazul eșecului.

Istoricul schimbărilor

Versiune Descriere
5.3.0 Pixelation support (IMG_FILTER_PIXELATE) was added.
5.2.5 Alpha support for IMG_FILTER_COLORIZE was added.

Exemple

Example #1 imagefilter() grayscale example

<?php
$im 
imagecreatefrompng('dave.png');

if(
$im && imagefilter($imIMG_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(
$im && imagefilter($imIMG_FILTER_BRIGHTNESS20))
{
    echo 
'Image brightness changed.';

    
imagepng($im'sean.png');
    
imagedestroy($im);
}
else
{
    echo 
'Image brightness change failed.';
}
?>

Example #3 imagefilter() colorize example

<?php
$im 
imagecreatefrompng('philip.png');

/* R, G, B, so 0, 255, 0 is green */
if($im && imagefilter($imIMG_FILTER_COLORIZE02550))
{
    echo 
'Image successfully shaded green.';

    
imagepng($im'philip.png');
    
imagedestroy($im);
}
else
{
    echo 
'Green shading failed.';
}
?>

Example #4 imagefilter() negate example

<?php
// Define our negate function so its portable for 
// php versions without imagefilter()
function negate($im)
{
    if(
function_exists('imagefilter'))
    {
        return 
imagefilter($imIMG_FILTER_NEGATE);
    }

    for(
$x 0$x imagesx($im); ++$x)
    {
        for(
$y 0$y imagesy($im); ++$y)
        {
            
$index imagecolorat($im$x$y);
            
$rgb imagecolorsforindex($index);
            
$color imagecolorallocate($im255 $rgb['red'], 255 $rgb['green'], 255 $rgb['blue']);

            
imagesetpixel($im$x$y$color);
        }
    }

    return(
true);
}

$im imagecreatefromjpeg('kalle.jpg');

if(
$im && negate($im))
{
    echo 
'Image successfully converted to negative colors.';

    
imagejpeg($im'kalle.jpg'100);
    
imagedestroy($im);
}
else
{
    echo 
'Converting to negative colors failed.';
}
?>

Example #5 imagefilter() pixelate example

<?php
// Load the PHP logo, we need to create two instances 
// to show the differences
$logo1 imagecreatefrompng('./php.png');
$logo2 imagecreatefrompng('./php.png');

// Create the image instance we want to show the 
// differences on
$output imagecreatetruecolor(imagesx($logo1) * 2imagesy($logo1));

// Apply pixelation to each instance, with a block 
// size of 3
imagefilter($logo1IMG_FILTER_PIXELATE3);
imagefilter($logo2IMG_FILTER_PIXELATE3true);

// Merge the differences onto the output image
imagecopy($output$logo10000imagesx($logo1) - 1imagesy($logo1) - 1);
imagecopy($output$logo2imagesx($logo2), 000imagesx($logo2) - 1imagesy($logo2) - 1);
imagedestroy($logo1);
imagedestroy($logo2);

// Output the differences
header('Content-Type: image/png');
imagepng($output);
imagedestroy($output);
?>

Exemplul de mai sus va afișa ceva similar cu:

Output of example : imagefilter() pixelate

Note

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