PHP 매뉴얼
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# imagecolorat

(PHP 3, PHP 4 , PHP 5)

imagecolorat -- Get the index of the color of a pixel

## Description

int imagecolorat ( resource 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 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:

예 1. Access distinct RGB values

`<?php $im = ImageCreateFromPng("rockym.png"); $rgb = ImageColorAt($im, 100, 100); $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> 8) & 0xFF; $b = $rgb & 0xFF; ?>`

See also imagecolorset() and imagecolorsforindex().

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imagecolorallocatealpha | 위로 | imagecolorclosest