Man of Honour
Since you've saved the image has been flattened the answer is no, you cannot see what was or is underneath the black.
In order to do what you're asking you have to have the image saved with layers so it has to be saved in one of the compatible formats, tiff, psd etc.
In order to do what you're asking you have to have the image saved with layers so it has to be saved in one of the compatible formats, tiff, psd etc.