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imagecolorclosest
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imagecolorclosest

Name

imagecolorclosest — Finds the closest color in the image to the color required.

Synopsis

int imagecolorclosest(image, red, green, blue); int image: Image identifier int red: Red component int green: Green component int blue: Blue component

Returns

Color index

Description

This function, along with other functions, is good for color manipulation inside a dynamic image. imagecolorclosest() lets you specify a custom color, and the function searches for and returns the closest match it can find in the color palette. It's not useful in a function such as imagecolortransparent() , but can be used for other purposes such as determining whether the base image contains a required range of color without actually needing the exact color.

Example

Example 395. Get the actual color closest to the desired color from an image

header("Content-type: image/png");
$im = imagecreate(200, 200);
$red = imagecolorallocate($im, 255, 0, 0);
// create a shade of blue
$offblue = imagecolorallocate($im, 90, 90, 200);
imagefill($im, 0, 0, $red);
imagefilledrectangle($im, 10, 10, 40, 40, $offblue);
// get closest color to actual blue from image
$newblue = imagecolorclosest($im, 0, 0, 255);
imagefilledrectangle($im, 100, 100, 140, 140, $newblue);
imagepng($im);
imagedestroy($im);

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