Get an image average color

The goal is to determine what's the average (dominant) color of an binary image (JPEG, PNG, GIF, WBMP, and GD2).

I started from this GitHub solution. Just that:

  • I used the elasticms common image resizing to reuse the cache mecanism (and not resize images each time)
  • I added RuntimeException exceptions
  • I backslash (\) prefixed root class domain functions 
public function assetAverageColor(string $hash): string
{
    try {
        $config = $this->processor->configFactory($hash, [
            EmsFields::ASSET_CONFIG_TYPE => EmsFields::ASSET_CONFIG_TYPE_IMAGE,
            EmsFields::ASSET_CONFIG_RESIZE => 'free',
            EmsFields::ASSET_CONFIG_WIDTH => 1,
            EmsFields::ASSET_CONFIG_HEIGHT => 1,
            EmsFields::ASSET_CONFIG_QUALITY => 80,
            EmsFields::ASSET_CONFIG_MIME_TYPE => 'image/jpeg',
        ]);
        $stream = $this->processor->getStream($config, 'one-pixel.jpg');

        $image = \imagecreatefromstring($stream->getContents());
        if (false === $image) {
            throw new \RuntimeException('Unexpected imagecreatefromstring error');
        }
        $index = \imagecolorat($image, 0, 0);
        if (false === $index) {
            throw new \RuntimeException('Unexpected imagecolorat error');
        }
        $rgb = \imagecolorsforindex($image, $index);
        if (false === $rgb) {
            throw new \RuntimeException('Unexpected imagecolorsforindex error');
        }
        $red = \round(\round((($rgb['red'] ?? 255) / 0x33)) * 0x33);
        $green = \round(\round((($rgb['green'] ?? 255) / 0x33)) * 0x33);
        $blue = \round(\round((($rgb['blue'] ?? 255) / 0x33)) * 0x33);

        return \sprintf('#%02X%02X%02X', $red, $green, $blue);
    } catch (\Throwable $e) {
        return '#FFFFFF';
    }
}

Check Common Bundle documentation.

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