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(7) Other phenomena
(Area effect)
The same color will appear different depending on the size of the area of the color. The larger the area of the color, the more vivid and the more bright it appears.
[8] Digital imaging
Images handled by your computer are digital images, and differ from normal analog images. Digital images consist of many small pixels formed by the sampling of the original image. These pixels are then quantified and expressed in terms of how many are contained in the image. Thus, the image quality is proportional to the number of pixels in the image and their concentration. In normal situations, an image is described by the number of pixels that lie horizontally across the image by the number of pixels that lie vertically down the image. The number of pixels per unit of length is called the resolution of the image. The most common unit of measurement for image resolution is dots per inch (dpi), where the unit of length is the inch.
(Expansion and contraction)
This phenomenon makes shapes seem to enlarge or shrink. In general bright and warm colors appear larger. In the figures below, the yellowish orange will appear larger than the cool blue.
1. Types of digital images
(Binary images)
Images where each pixel contains only binary data (i.e., black or white). This type of image is suitable for letters and characters, and is not well suited for photographs.
(Advancing and retreating)
In the figure below, the reds (warm colors) appear to stick out from the picture, and the blues (cool colors) appear to retreat within the picture.
(Grayscale images)
Images where each pixel has no color, but several different levels of brightness. The different shades of gray pixels depict the picture. Used for monochrome imaging.
(Assimilation)
When the background color is affected by the foreground color and seems to gain its attributes, it is called assimilation. In the figures below, the background color is affected by the foreground colors (the colors of the letters) and appears darker and lighter. The background seems darker when the foreground letters are black, and lighter when the foreground letters are white.
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