PHP imagecolorsforindex - made colors for an index

PHP Image Processing

imagecolorsforindex - made colors for an index.

grammar

array imagecolorsforindex ( resource $image , int $index )

This function returns a having a red, associative array keys in green, blue and alpha, including the corresponding value of the specified color index.

Examples

<?php

// 打开一幅图像
$im = imagecreatefrompng('w3big-logo.png');

// 取得一点的颜色
$start_x = 40;
$start_y = 20;
$color_index = imagecolorat($im, $start_x, $start_y);

// 使其可读
$color_tran = imagecolorsforindex($im, $color_index);

// 显示该颜色的值
print_r($color_tran);

?>

Output similar to the above example:

Array
(
    [red] => 195
    [green] => 223
    [blue] => 165
    [alpha] => 64
)

related articles

• imagecolorat () to obtain an index value of a color pixel.
• imagecolorexact () Get the index of the specified color.

PHP Image Processing