public ColorRGBA getPixel(int x, int y) {
        return getPixel(x, y, null);
    }
Retrieve the color at the given coordinate.
<p>
Convenience method that does not take a store argument. Equivalent
to calling getPixel(x, y, null).
See {@link #getPixel(int, int, com.jme3.math.ColorRGBA) } for
more information.

@param x The x coordinate, from 0 to width - 1.
@param y The y coordinate, from 0 to height - 1.
@return A new ColorRGBA with the read color.
@throws IllegalArgumentException If x or y are outside the image dimensions
jme3-core/src/main/java/com/jme3/texture/image/ImageRaster.java