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The five eras are general- purpose mainframe and minicomputer computing, personal computers, client/server networks, ...
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Contrast is a tool that photographers use to direct viewers' attention to their subject. There are two types: Tonal Contrast and Color Contrast. TC refers to the difference in tones from the lightest tone to the darkest tone, in other words, the difference in tones from white to gray to black.
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Pinhole cameras were one of the most sophisticated devices of the period, it made tasks much easier it basically worked exactly like the human eye and is something just like tracing.