(PHP 4 >= 4.0.6, PHP 5, PHP 7)
imagecolorresolvealpha — Get the index of the specified color + alpha or its closest possible alternative
$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.
image
Eine von den verschiedenen Erzeugungsfunktionen wie imagecreatetruecolor() gelieferte Grafikressource.
red
Wert der Rotkomponente.
green
Wert der Grünkomponente.
blue
Wert der Blaukomponente.
alpha
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
Returns a color index.
Beispiel #1 Using imagecoloresolvealpha() 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($colors);
imagedestroy($im);
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Array ( [0] => 89 [1] => 85 )