Crop or mask an image into a circle

What is the best way to crop or mask an image into a circular shape, using either ImageMagick or GD libraries? (Note, solution exists on "other" Q&A sites, but not StackOverflow)

Solution 1:

Here is one way with ImageMagick that will acomplish this without using a mask:

convert -size 200x200 xc:none -fill walter.jpg -draw "circle 100,100 100,1" circle_thumb.png

Solution 2:

For those who need to do this in pure PHP using Imagick, you will need to refer to this question : circularize an image with imagick

Hope this will help.

J.

Solution 3:

For those who wants a solution in PHP, providing the picture already cropped into a circle:

// convert the picture
    $w = 640;  $h=480; // original size
    $original_path="/location/of/your/original-picture.jpg";
    $dest_path="/location/of/your/picture-crop-transp.png";
    $src = imagecreatefromstring(file_get_contents($original_path));
    $newpic = imagecreatetruecolor($w,$h);
    imagealphablending($newpic,false);
    $transparent = imagecolorallocatealpha($newpic, 0, 0, 0, 127);
    $r=$w/2;
    for($x=0;$x<$w;$x++)
        for($y=0;$y<$h;$y++){
            $c = imagecolorat($src,$x,$y);
            $_x = $x - $w/2;
            $_y = $y - $h/2;
            if((($_x*$_x) + ($_y*$_y)) < ($r*$r)){
                imagesetpixel($newpic,$x,$y,$c);
            }else{
                imagesetpixel($newpic,$x,$y,$transparent);
            }
        }
    imagesavealpha($newpic, true);
    imagepng($newpic, $dest_path);
    imagedestroy($newpic);
    imagedestroy($src);