imagecolorclosestalpha

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

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

Descrierea

imagecolorclosestalpha ( resource $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.

Parametri

image

O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().

red

Valoarea componentei roșii.

green

Valoarea componentei verzi.

blue

Valoarea componentei albastre.

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.

Valorile întoarse

Returns the index of the closest color in the palette.

Exemple

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

<?php
// Start with an image and convert it to a palette-based image
$im imagecreatefrompng('figures/imagecolorclosest.png');
imagetruecolortopalette($imfalse255);

// Search colors (RGB)
$colors = array(
    array(
25414515450),
    array(
153145188127),
    array(
153901450),
    array(
2551379284)
);

// 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);
?>

Exemplul de mai sus va afișa ceva similar cu:

#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).

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