imagefilter

    (PHP 5, PHP 7, PHP 8)

    imagefilter — Applies a filter to an image

    Beschreibung

    imagefilter(GdImage$image, int$filter, array|int|float|bool...$args): bool

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

    Parameter-Liste

    image

    Ein GdImage-Objekt, das von einer der Funktionen zur Bilderzeugung, z. B. imagecreatetruecolor(), zurückgegeben wurde.

    filter

    filter 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 args 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 args to set the level of contrast.
    • IMG_FILTER_COLORIZE: Like IMG_FILTER_GRAYSCALE, except you can specify the color. Use args, 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 args to set the level of smoothness.
    • IMG_FILTER_PIXELATE: Applies pixelation effect to the image, use args to set the block size and arg2 to set the pixelation effect mode.
    • IMG_FILTER_SCATTER: Applies scatter effect to the image, use args and arg2 to define the effect strength and additionally arg3 to only apply the on select pixel colors.
    args

    arg2

    arg3

    arg4

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

    Rückgabewerte

    Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

    Changelog

    VersionBeschreibung
    8.0.0image erwartet nun eine GdImage-Instanz; vorher wurde eine gültige gd-Ressource erwartet.
    7.4.0 Scatter support (IMG_FILTER_SCATTER) was added.

    Beispiele

    Beispiel #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);
    ?>

    Beispiel #2 imagefilter() brightness example

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

    if(    $im && imagefilter($im, IMG_FILTER_BRIGHTNESS, 20))
    {
    echo     'Image brightness changed.';

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

    Beispiel #3 imagefilter() colorize example

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


    if($im && imagefilter($im, IMG_FILTER_COLORIZE, 0, 255, 0))
    {
    echo     'Image successfully shaded green.';

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

    Beispiel #4 imagefilter() negate example

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

    for(    $x = 0; $x < imagesx($im); ++$x)
    {
    for(    $y = 0; $y < imagesy($im); ++$y)
    {
    $index = imagecolorat($im, $x, $y);
    $rgb = imagecolorsforindex($index);
    $color = imagecolorallocate($im, 255 - $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.';
    }
    ?>

    Beispiel #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) * 2, imagesy($logo1));

    // Apply pixelation to each instance, with a block
    // size of 3
    imagefilter($logo1, IMG_FILTER_PIXELATE, 3);
    imagefilter($logo2, IMG_FILTER_PIXELATE, 3, true);

    // Merge the differences onto the output image
    imagecopy($output, $logo1, 0, 0, 0, 0, imagesx($logo1) - 1, imagesy($logo1) - 1);
    imagecopy($output, $logo2, imagesx($logo2), 0, 0, 0, imagesx($logo2) - 1, imagesy($logo2) - 1);
    imagedestroy($logo1);
    imagedestroy($logo2);

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

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    Output of example : imagefilter() pixelate

    Beispiel #6 imagefilter() scatter example

    <?php
    // Load the image
    $logo = imagecreatefrompng('./php.png');

    // Apply a very soft scatter effect to the image
    imagefilter($logo, IMG_FILTER_SCATTER, 3, 5);

    // Output the image with the scatter effect
    header('Content-Type: image/png');
    imagepng($logo);
    imagedestroy($logo);
    ?>

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    Output of example : imagefilter() scatter

    Anmerkungen

    Hinweis: The result of IMG_FILTER_SCATTER is always random.

    Siehe auch

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