IMedia Knowledge Organiser Practice Exam

How is width in inches calculated from an image's width in pixels and PPI?

Width in inches equals the pixel width times PPI. Width in inches equals PPI divided by the pixel width. Width in inches equals the pixel width added to PPI. Width in inches equals width in pixels divided by PPI.

Correct Answer:

Width in inches equals width in pixels divided by PPI.

Explanation:

Converting pixels to inches relies on how many pixels fit into one inch, which is the PPI (pixels per inch) value. PPI tells you the density of the image: how many pixels occupy each inch of physical space. So the physical width is the pixel width divided by the PPI. In formula form: width in inches = width in pixels ÷ PPI. For example, 1920 pixels wide at 96 PPI is 1920 ÷ 96 = 20 inches; at 300 PPI, the same 1920-pixel width becomes 1920 ÷ 300 = 6.4 inches. This shows why the same pixel count yields different physical sizes depending on density.

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