Visual Diff

Visual Diff is a differencing representation that shows the difference between two objects(Text documents, pictures, etc). For instance, two columns of text connected by lines to show where changes have been made.  or two documents with the color bar on the text which highlights the adding and deleting have been done between the two versions.

This type of visualization is wildly used in information technology like version control system, in order to find out the difference or updating have been made in files.

Way of Mapping

There are various comparison strategies visual diff can use, like gradient, color bar, text, pointer.

This screenshot shows how Visual Diff is used in a Programming environment. 
This screenshot shows how Visual Diff is used for text. 
Without line connecting two panels, the Visual Diff is less effective.
This screenshot shows how Visual Diff can be used in computer vision to point out the difference between pictures.
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