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imagecolorclosestalpha

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

imagecolorclosestalphaGet the index of the closest color to the specified color + alpha

Descrizione

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

Returns the index of the color in the palette of the image which is "closest" to the specified RGB value and alpha level.

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 the index of the closest color in the palette.

Esempi

Example #1 Search for a set of colors in an image

<?php
// Start with an image and convert it to a palette-based image
$im = imagecreatefrompng('figures/imagecolorclosest.png');
imagetruecolortopalette($im, false, 255);

// Search colors (RGB)
$colors = array(
array(
254, 145, 154, 50),
array(
153, 145, 188, 127),
array(
153, 90, 145, 0),
array(
255, 137, 92, 84)
);

// Loop through each search and find the closest color in the palette.
// Return the search number, the search RGB and the converted RGB match
foreach($colors as $id => $rgb)
{
$result = imagecolorclosestalpha($im, $rgb[0], $rgb[1], $rgb[2], $rgb[3]);
$result = imagecolorsforindex($im, $result);
$result = "({$result['red']}, {$result['green']}, {$result['blue']}, {$result['alpha']})";

echo
"#$id: Search ($rgb[0], $rgb[1], $rgb[2], $rgb[3]); Closest match: $result.\n";
}

imagedestroy($im);
?>

Il precedente esempio visualizzerà qualcosa simile a:

#0: Search (254, 145, 154, 50); Closest match: (252, 150, 148, 0).
#1: Search (153, 145, 188, 127); Closest match: (148, 150, 196, 0).
#2: Search (153, 90, 145, 0); Closest match: (148, 90, 156, 0).
#3: Search (255, 137, 92, 84); Closest match: (252, 150, 92, 0).

Vedere anche:

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