![2000 fonts collection 2000 fonts collection](http://luc.devroye.org/Bastarda-ElsnerFlake-AlteSchwabacher.gif)
If each pixel on the display actually contains three rectangular subpixels of red, green, and blue, in that fixed order, then things on the screen that are smaller than one full pixel in size can be rendered by lighting only one or two of the subpixels. If the computer controlling the display knows the exact position and color of all the subpixels on the screen, it can take advantage of this to improve the apparent resolution in certain situations. In the illustration above, there are nine pixels but 27 subpixels.
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Dick Brass, a Vice President at Microsoft from 1997 to 2004, complained that the company was slow in moving ClearType to market in the portable computing field. It was then analyzed by researchers in the company, and signal processing expert John Platt designed an improved version of the algorithm. ĬlearType was invented in the Microsoft e-Books team by Bert Keely and Greg Hitchcock. In theory, the method (called "RGB Decimation" internally) can enhance the anti-aliasing of any digital image. For example, ClearType enhancement renders text on the screen in Microsoft Word, but text placed in a bitmapped image in a program such as Adobe Photoshop is not. ClearType does not alter other graphic display elements (including text already in bitmaps). Only user and system applications render the application of ClearType. The compromise can improve text appearance when luminance detail is more important than chrominance.
![2000 fonts collection 2000 fonts collection](https://miro.medium.com/max/2000/1*wpOumOVOPWNJcwf0U7-t2w.png)
Like most other types of subpixel rendering, ClearType involves a compromise, sacrificing one aspect of image quality (color or chrominance detail) for another (light and dark or luminance detail). This increases edge contrast and readability of small fonts at the expense of font rendering fidelity and has been criticized by graphic designers for making different fonts look similar. ClearType also uses very heavy font hinting to force the font to fit into the pixel grid. ClearType uses spatial anti-aliasing at the subpixel level to reduce visible artifacts on such displays when text is rendered, making the text appear "smoother" and less jagged. Computer displays where the positions of individual pixels are permanently fixed – such as most modern flat panel displays – can show saw-tooth edges when displaying small, high-contrast graphic elements, such as text.