Created a new Cocoa Application using the standard Xcode template.
Added "Open File" button and set up Auto Layout constraints.
Hooked the "Open File" button up to an IBAction.
Added a Box and set up Auto Layout constraints.
Hooked the Box up to an IBOutlet.
When the "Open File" box is pressed, a file dialogue is opened. If a valid image file is selected, an NSImage is created from it.
When a valid image is loaded, it is shown in the Box.
Added a "Transform" button and hooked it up to an IBAction.
Added LICENSE file.
Removed an unnecessary exclamation mark!
Clicking the "Transform" button converts the image to bitmap format.
Implemented bitmapRepresentation function in ViewController class.
Removed the bitmapRepresentation function. Already implicitly included in NSImage.
Clicking the "Transform" button now converts the image to grayscale.