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.
Nota: Questa funzione รจ disponibile soltanto se
il PHP ` compilato con la libreria GD allegata.
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Esempio 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); ?>
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Esempio 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); ?>
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Esempio 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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