If the Resample option is on, you can watch the Image Size number change as you adjust the Width, Height, or Resolution. This number tells you how much disk space the document would use it if it was saved as a single layer. The first place you might see a document size in Photoshop is at the top of the Image > Image Size dialog box. What’s the Document Size in the Image Size Dialog Box? And the answer isn’t just academic, because understanding why could save you a lot of storage space on your hard drive or in the cloud. How can one Photoshop image grow and shrink dramatically during production, even without compression? It’s a question that comes up regularly.
