PHP: Hypertext Preprocessor (original) (raw)

imagecolorresolvealpha

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

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

Description

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.

Parameters

image

A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().

red

Value of red component.

green

Value of green component.

blue

Value of blue component.

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.

Return Values

Returns a color index.

Changelog

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

Examples

Example #1 Using imagecoloresolvealpha() to get colors from an image

<?php // Load an image $im = imagecreatefromgif('phplogo.gif');// Get closest colors from the image $colors = array(); <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>s</mi><mo stretchy="false">[</mo><mo stretchy="false">]</mo><mo>=</mo><mi>i</mi><mi>m</mi><mi>a</mi><mi>g</mi><mi>e</mi><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>r</mi><mi>e</mi><mi>s</mi><mi>o</mi><mi>l</mi><mi>v</mi><mi>e</mi><mi>a</mi><mi>l</mi><mi>p</mi><mi>h</mi><mi>a</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">colors[] = imagecolorresolvealpha(</annotation></semantics></math>colors[]=imagecolorresolvealpha(im, 255, 255, 255, 0); <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>s</mi><mo stretchy="false">[</mo><mo stretchy="false">]</mo><mo>=</mo><mi>i</mi><mi>m</mi><mi>a</mi><mi>g</mi><mi>e</mi><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>r</mi><mi>e</mi><mi>s</mi><mi>o</mi><mi>l</mi><mi>v</mi><mi>e</mi><mi>a</mi><mi>l</mi><mi>p</mi><mi>h</mi><mi>a</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">colors[] = imagecolorresolvealpha(</annotation></semantics></math>colors[]=imagecolorresolvealpha(im, 0, 0, 200, 127);// Output print_r($colors); ?>

The above example will output something similar to:

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

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