PHP 8.4.0 RC4 available for testing

imagecolorresolvealpha

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

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

Descrizione

imagecolorresolvealpha(
    GdImage $image,
    int $red,
    int $green,
    int $blue,
    int $alpha
): int

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

Elenco dei parametri

image

Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().

red

Valore della componente rossa.

green

Valore della componente verde.

blue

Valore della componente blu.

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.

Valori restituiti

Returns a color index.

Log delle modifiche

Versione Descrizione
8.0.0 image expects a GdImage instance now; previously, a valid gd resource was expected.

Esempi

Example #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);
?>

Il precedente esempio visualizzerà qualcosa simile a:

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

Vedere anche:

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