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The one-bit Gray code is G 1 = (0,1). This can be thought of as built recursively as above from a zero-bit Gray code G 0 = ( Λ ) consisting of a single entry of zero length. This iterative process of generating G n+1 from G n makes the following properties of the standard reflecting code clear:
A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum , and a white reverse side with a 90% reflectance.
For example, to print a white character with a black background, a color attribute of 0F hex would be used. The high four bits are set to 0000 bin, representing the background color, black. The low 4 bits, 1111 bin, represent the foreground color, white. The highest bit of the color attribute, which is also the highest bit of the background ...
The 5-bit Baudot code used in early synchronous multiplexing telegraphs can be seen as an offset-1 (excess-1) reflected binary (Gray) code. One historically prominent example of offset-64 (excess-64) notation was in the floating point (exponential) notation in the IBM System/360 and System/370 generations of computers.
Powers of the 4-bit Gray code permutation (compare A195467) The permutation matrices are arranged in a cycle graph of the cyclic group Z 4 like , but the identity is in the top left position, so that the symmetric matrices are mirrored at the diagonal. Cayley table of the cyclic group (The orange vectors are the same as in the cycle graph.)
A mnemonic which includes color name(s) generally reduces the chances of confusing black and brown. Some mnemonics that are easy to remember: Big Boys Race Our Young Girls But Violet Generally Wins.
Systems with a 12-bit RGB palette use 4 bits for each of the red, green, and blue color components. This results in a (2 4) 3 = 16 3 = 4096-color palette. 12-bit color can be represented with three hexadecimal digits, also known as shorthand hexadecimal form, which is commonly used in web design. The palette is as follows:
Date/Time Thumbnail Dimensions User Comment; current: 09:01, 22 April 2019: 250 × 200 (37 KB): Watchduck: fewer colors, yet a new color for new digits: 19:00, 30 April 2009