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Chapter 6. Optimizing Grayscale Images > Ben's Techno-Babble Decoder Ring

Ben's Techno-Babble Decoder Ring

30-bit: Designates how many colors a scanner can capture (10 bits of red + 10 bits of green + 10 bits of blue = 30 bits total). So 10 bits per channel (RGB) is the same as 30 bits total. 10 bits = 2 to the tenth power, which equals 1,024. So a 30-bit scanner can capture 1.1 billion colors (1,024 × 1,024 × 1,024 = 1.1 billion), whereas a 24-bit scanner can capture only 16.7 million colors. When scanning in grayscale, a 24-bit scanner captures 256 grays and a 30-bit scanner captures 1,024 grays.

Maximum shadow dot: The largest halftone dot that will not combine with the surrounding halftone dots to become pure black. This is usually measured as a percentage, and reflects the highest percentage of ink that could be used without losing detail when printed. The type of paper usually determines what the maximum shadow dot setting will be.


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