How to use ImageMagick getImagePixelColor as exec command?

Question

I try to get the pixel at a coordinate in a image. I have the following working in PHP, but unfortunately my current setup only allows to use EXEC access to ImageMagick.

How would these lines look as an exec command

$img = new Imagick('test2.jpg');
$pixel = $img->getImagePixelColor(10, 10);
$target = $pixel->getColorAsString();

Thanks

Answer 1

For CLI command, user the -format operator to read color information.

convert test2.jpg -format '%[pixel:p{10,10}]' info:-

See Accessing Pixels section in the FX document, and Format & Print Image Properties.

An explanation:

%[pixel:        ] <= Evaluate a pixel color by FX expression
        p{10,10}  <= An FX expression to specify an absolute position

You can also simplify the above example by using the identify utility

identify -format '%[pixel:p{10,10}]' test2.jpg