Working with Images in eLearning (part 1)

As eLearning developers we regularly work with images in our projects and while we aren’t all graphic designers, it helps to have a basic knowledge of the terminology around image properties and file types which is what this post is about.

A ‘pixel’ is the unit of measurement used for digital images and when you see the size of an image, let’s say 450 x 300, the first number is always the width and the second is the height:

The resolution of an image is different and is usually expressed as pixels per inch (ppi) or dots per inch (dpi) and this describes how many pixels there are in a liner inch. When sourcing images from a photo website I look for a high ppi or dpi number:

In this example I’d choose the medium (or maybe the large) over the small as it would be a higher quality and better for resizing.

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