imagecolorresolvealpha

imagecolorresolvealpha

Get the index of the specified color + alpha or its closest possible alternative

int **imagecolorresolvealpha** GdImage $image int $red int $green int $blue int $alpha

This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.

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

greengd.value.green

bluegd.value.blue

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

Returns a color index.

Voorbeeld: Using to get colors from an image

<?php
// Load an image
$im = imagecreatefromgif('phplogo.gif');

// Get closest colors from the image
$colors = array();
$colors[] = imagecolorresolvealpha($im, 255, 255, 255, 0);
$colors[] = imagecolorresolvealpha($im, 0, 0, 200, 127);

// Output
print_r($colors);
?>

Array
(
    [0] => 89
    [1] => 85
)

imagecolorclosestalpha