Average DitheringAverage Dithering (also known as "Thresholding") is a method of dithering color or gray scale images into monochrome (black and white).
Average Dithering is based on a very simple method: a threshold value is chosen, and any pixels which are darker than the threshold become black, and any pixels which are lighter than the threshold become white.
With a carefully chosen threshold, Average Dithering tends to produce adequate results on most gray scale images. The quality of results on color images tends to be variable, and highly dependent on both the content of the initial image and the choice of threshold. In all cases, after an image has been processed by average dithering you should expect to both lose some detail, and also to introduce visible contour artifacts.
The picture below shows a True Color image, and the results of converting it to monochrome using average dithering:
To give you an idea of what the detail of image looks like after Average Dithering, here is the monochrome image greatly enlarged so that you can see the individual pixels:
The pictures below shows some gray scale images, and the results of converting them to monochrome using average dithering:
To give you an idea of what the detail of image looks like after Average Dithering, here is the monochrome guitar image greatly enlarged so that you can see the individual pixels:
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