PHP. Руководство по PHP. 2005

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:

Пример 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;
?>

Пред.

Начало

След.

imagecolorallocatealpha

Уровень выше

imagecolorclosest

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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