IMAGECOLORRESOLVEALPHA(3) 1 IMAGECOLORRESOLVEALPHA(3)
imagecolorresolvealpha - Get the index of the specified color + alpha or its closest possible alternative
SYNOPSIS
int imagecolorresolvealpha (resource $image, int $red, int $green, int $blue, int $alpha)
DESCRIPTION
This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.
PARAMETERS
o $
image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).
o $red
-Value of red component.
o $green
-Value of green component.
o $blue
-Value of blue component.
o $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.
EXAMPLES
Example #1
Using imagecoloresolvealpha(3) 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);
?>
The above example will output something similar to:
Array
(
[0] => 89
[1] => 85
)
NOTES
Note
This function requires GD 2.0.1 or later (2.0.28 or later is recommended).
SEE ALSO
imagecolorclosestalpha(3).
PHP Documentation Group IMAGECOLORRESOLVEALPHA(3)