Reveal All will resize the canvas to show any content that exceeds the document boundaries. In a similar fashion to using the Canvas Size dialog window, the transparent option will only be visible when your layers are unlocked. Trim removes unwanted areas of transparent pixels or background pixels of a specified colour. Trim and Reveal All are both functions that affect canvas size, without having to enter the Canvas Size dialogue window. Photoshop CC also allows you to do calculations inside all number fields. By selecting the Relative checkbox you will be able to add or takeaway an equal number of pixels from around the current canvas size. The canvas anchor point is automatically set to be centred, adjusting the canvas size uniformly around the whole image, but can be moved if you wish to add or remove pixels from any particular edge.
The dialogue window lets you enter new values for both the width and height of the canvas, offering a range of measurement units to suit your purpose you should be using pixels for digital, and inch/centimetre for print. You can make these adjustments by going to Image > Canvas Size in the Menu bar.
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