To identify and reduce an image to its essential part (or critical feature). In the case of cropping an image to support and enhance reading comprehension, the essential part of the image is the part of the image that conveys the meaning intended by the author.

Elements on the page
Images, text, background, etc.

Line length
the number of characters in a line of text. Sixty characters per line is optimal for print. Fifty characters per line is optimal for the web. If text is enlarged, a twenty character line is best.

line length

a dangling word or short phrase at the beginning of a paragraph

Reader exhaustion

Reader exhaustion occurs when the reader is overloaded or distracted with visual or verbal information to the point when they are not paying attention to the content.



Type style
Text has two features that convey meaning, the type style (or commonly referred to as a font) and a communication signal. The communication signal tells us what it is, like "cat" and the type style defines its visual characteristics. This visual characteristic has meaning dependent on the style. A script type style is appropriate for a wedding invitation whereas a simple neutral type style is appropriate for a business letter.

Visual weight

Typestyles have weights, regular, bold, light, heavy. For example, 'window' is set in a regular weight and 'animal' is in a bold weight.

Pictures also have weight although it requires that the eye estimate these weights. For example, the window picture is lighter than the animal picture on the right. The window was drawn with a lighter drawing instrument and uses lighter color whereas the animal was painted with a thicker paint and uses darker colors.  

a dangling word or short phrase at the end of a paragraph