Answered By: Steven Vance
Last Updated: Oct 24, 2017     Views: 2475

Almost any photo viewing or editing software provides an option to resize an image.  In Photoshop, this is found under Image>Image Size....

It is important to remember that sizing for print and sizing for the screen are often different.  While in sizing for print one can designate the actual size that an image will appear (say, 5 inches by 7 inches), onscreen image display will vary based upon the screen resolution of the monitor on which the image is being viewed.  In other words, if I view an image on my screen, which is set to a resolution of 1680x1050, it would appear larger than it would on a screen (of the same size) set to a resolution of 1920x1080.  When sizing for the screen, one should think in terms of pixels, rather than a measurement like inches or centimeters.

Image resolution refers to how many pixels are used to describe a certain area of image.  We commonly refer to image resolution in terms of pixels per inch.  So an image that was 1200 pixels wide at a resolution of 300 dpi would have a native width of 4 inches.

I could have two monitors of different sizes that are set to the same resolution.  As such, the 1200 pixels of the above example might be displayed in different amounts of screen space on the two monitors.

A few  notes:

Print resolutions are commonly 300 or 600 dpi.

Resolutions for web images are commonly 72 dpi.



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