Returns the index of the color of the pixel at the specified location in the image specified by image
.
If PHP is compiled against GD library 2.0 or higher and the image is a truecolor image, this function returns the RGB value of that pixel as integer. Use bitshifting and masking to access the distinct red, green and blue component values:
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
x-coordinate of the point.
y-coordinate of the point.
Returns the index of the color.
<?php $im = imagecreatefrompng("php.png"); $rgb = imagecolorat($im, 10, 15); $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> 8) & 0xFF; $b = $rgb & 0xFF; var_dump($r, $g, $b); ?>
The above example will output something similar to:
int(119) int(123) int(180)
<?php $im = imagecreatefrompng("php.png"); $rgb = imagecolorat($im, 10, 15); $colors = imagecolorsforindex($im, $rgb); var_dump($colors); ?>
The above example will output something similar to:
array(4) { ["red"]=> int(119) ["green"]=> int(123) ["blue"]=> int(180) ["alpha"]=> int(127) }
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