* first two array keys (the width and height), and the 'bits' associative
* key. All other array keys are ignored. Returning a 'bits' key is optional
* as not all formats have a notion of "bitdepth". Returns false on failure.
* first two array keys (the width and height), and the 'bits' associative
* key. All other array keys are ignored. Returning a 'bits' key is optional
* as not all formats have a notion of "bitdepth". Returns false on failure.