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PHP. Руководство по PHP. 2005

imagefilter

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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.

    Замечание: Эта функция доступна только в том

    случае, если PHP был скомпилирован со встроенной библиотекой GD.

    • Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

    Пример 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);

    ?>

    Пример 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);

    ?>

    Пример 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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    Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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