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imagecolorat

imagecolorat

Get the index of the color of a pixel

 **imagecolorat** GdImage $image int $x int $y

Returns the index of the color of the pixel at the specified location in the image specified by . image

If 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:

xx-coordinate of the point.

yy-coordinate of the point.

Returns the index of the color return.falseforfailure.

Voorbeeld: Access distinct RGB values

<?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);
?>

int(119)
int(123)
int(180)

**Voorbeeld: Human-readable RGB values using **

<?php
$im = imagecreatefrompng("php.png");
$rgb = imagecolorat($im, 10, 15);

$colors = imagecolorsforindex($im, $rgb);

var_dump($colors);
?>

array(4) {
  ["red"]=>
  int(119)
  ["green"]=>
  int(123)
  ["blue"]=>
  int(180)
  ["alpha"]=>
  int(127)
}

imagecolorset``imagecolorsforindex``imagesetpixel

Vorige ← imagecolorallocatealpha Volgende imagecolorclosest →

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