imagecolorexactalpha

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

imagecolorexactalpha — Get the index of the specified color + alpha

Description

int imagecolorexactalpha ( resource $image , int $red , int $green , int $blue , int $alpha )

Returns the index of the specified color+alpha in the palette of the image.

Parameters

`image`

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

red

Value of red component.

green

Value of green component.

blue

Value of blue component.

alpha

A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.

The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.

Return Values

Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.

Examples

Example #1 Get colors from the GD logo

<?php

//?Setup?an?image
$im?=?imagecreatefrompng('./gdlogo.png');

$colors???=?Array();
$colors[]?=?imagecolorexactalpha($im,?255,?0,?0,?0);
$colors[]?=?imagecolorexactalpha($im,?0,?0,?0,?127);
$colors[]?=?imagecolorexactalpha($im,?255,?255,?255,?55);
$colors[]?=?imagecolorexactalpha($im,?100,?255,?52,?20);

print_r($colors);

//?Free?from?memory
imagedestroy($im);
?>

The above example will output something similar to:

Array
(
    [0] => 16711680
    [1] => 2130706432
    [2] => 939524095
    [3] => 342163252
)

Description

Parameters

Return Values

Examples

See Also