Free Download Author : Prince NRVL Code name : 7 Dark Edition 2 (7DE2) Base : Windows 7 Ultimate, SP1 Architecture : x64 (64 BIT. Clear. Type - Wikipedia. Clear. Type is Microsoft's implementation of subpixel rendering technology in rendering text in a font system. Clear. Type attempts to improve the appearance of text on certain types of computer display screens by sacrificing color fidelity for additional intensity variation. This trade- off is asserted to work well on LCDflat panel monitors. Screenshot of Windows Vista Ultimate, showing its desktop, taskbar, Start menu, Windows Sidebar, Welcome Center and glass effects of Windows Aero. ClearType text is usually used on LCD monitors and Laptop screens. It provides smooth and clear display. The instructions in this article apply to Windows 7, 8, and 10, where the ClearType tuner is built in. If you’re still using Windows XP or Vista, you’ll need to. ![]()
Clear. Type was first announced at the November 1. COMDEX exhibition. The technology was first introduced in software in January 2. Clear. Type uses spatial anti- aliasing at the subpixel level to reduce visible artifacts on such displays when text is rendered, making the text appear . Clear. Type also uses very heavy font hinting to force the font to fit into the pixel grid. 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. The compromise can improve text appearance when luminance detail is more important than chrominance. Only user and system applications render the application of Clear. Type. Clear. Type does not alter other graphic display elements (including text already in bitmaps). For example, Clear. Type 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. In theory, the method (called . Most printers already use such small pixels that aliasing is rarely a problem, and they don't have the addressable fixed subpixels Clear. Type requires. Nor does Clear. Type affect text stored in files. Clear. Type only applies any processing to the text while it is being rendered onto the screen. Clear. Type was invented in the Microsoft e- Books team by Bert Keely and Greg Hitchcock. It was then analyzed by researchers in the company, and signal processing expert John Platt designed an improved version of the algorithm. However, actual display hardware usually implements each pixel as a group of three adjacent, independent subpixels, each of which displays a different primary color. Thus, on a real computer display, each pixel is actually composed of separate red, green, and blue subpixels. For example, if a flat- panel display is examined under a magnifying glass, the pixels may appear as follows: In the illustration above, there are nine pixels but 2. 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. 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. For example, if a diagonal line with a width smaller than a full pixel must be rendered, then this can be done by lighting only the subpixels that the line actually touches. If the line passes through the leftmost portion of the pixel, only the red subpixel is lit; if it passes through the rightmost portion of the pixel, only the blue subpixel is lit. This effectively triples the horizontal resolution of the image at normal viewing distances; the drawback is that the line thus drawn will show color fringes (at some points it might look green, at other points it might look red or blue). A diagonal line on a 1- bit display. Grayscale anti- aliasing. Identical to 1, but on a color monitor. Rendered with direct control of each color subpixel. Smaller version of 1- 4. Clear. Type uses this method to improve the smoothness of text. When the elements of a type character are smaller than a full pixel, Clear. Type lights only the appropriate subpixels of each full pixel in order to more closely follow the outlines of that character. Text rendered with Clear. Type looks “smoother” than text rendered without it, provided that the pixel layout of the display screen exactly matches what Clear. Type expects. The following picture shows a 4. The word was originally rendered using a Times New Roman 1. The word . Note the changes in subpixel intensity that are used to increase effective resolution when Clear. Type is enabled – without Clear. Type, all sub- pixels of a given pixel have the same intensity. In the above lines of text, when the orange circle is shown, all the text in the frame is rendered using Clear. Type (RGB subpixel rendering); when the orange circle is absent all the text is rendered using normal (full pixel greyscale) anti- aliasing. Clear. Type, human vision and cognition. Some individuals can detect slight differences in color better than others. Some people just notice it and are bothered by it a lot more than others. Some people are ok with the blur in Method C, some aren’t. Anecdotal evidence suggests that some people are fine with Method C when reading continuous text at 9. Times Reader, etc.) but not in UI scenarios. Many people are fine with the colors of Clear. Type, even at 9. 6 dpi, but a few aren’t. It reads “blurrily” to me. Conversely, at 1. I don’t see a problem with Method C. It looks and reads just fine to me. This and the previous example with the orange circle demonstrate the blurring introduced. Empirical studies. Clear. Type also yielded higher readability judgments and lower ratings of mental fatigue. The study notes that maximum benefit may be seen when the information worker is spending large proportions of their time reading text (which is not necessarily the case for the majority of computer users today). Additionally, over one third of the study participants experienced some disadvantage when using Clear. Type. Whether Clear. Type, or other rendering, should be used is very subjective and it must be the choice of the individual, with the report recommending . In a 2. 00. 4 study, for instance, Lee Gugerty, a psychology professor at Clemson University, in South Carolina, measured a 1. Clear. Type. Gugerty’s group also showed, in a sentence comprehension study, that Clear. Type boosted reading speed by 5 percent and comprehension by 2 percent. Similarly, in a study published last year, psychologist Andrew Dillon at the University of Texas at Austin found that when subjects were asked to scan a spreadsheet and pick out certain information, they did those tasks 7 percent faster with Clear. Type. More precisely, the positions of the pixels and subpixels on the screen must be exactly known to the computer to which it is connected. This is the case for flat- panel displays, on which the positions of the pixels are permanently fixed by the design of the screen itself. Almost all flat panels have a perfectly rectangular array of square pixels, each of which contains three rectangular subpixels in the three primary colors, with the normal ordering being red, green, and blue, arranged in vertical bands. Clear. Type assumes this arrangement of pixels when rendering text. Clear. Type does not work properly with flat- panel displays that are operated at resolutions other than their “native” resolutions, since only the native resolution corresponds exactly to the actual positions of pixels on the screen of the display. If a display does not have the type of fixed pixels that Clear. Type expects, text rendered with Clear. Type enabled actually looks worse than type rendered without it. Some flat panels have unusual pixel arrangements, with the colors in a different order, or with the subpixels positioned differently (in three horizontal bands, or in other ways). Clear. Type needs to be manually tuned for use with such displays (see below). Clear. Type will not work as intended on displays that have no fixed pixel positions, such as CRT displays, however it will still have some antialiasing effect and may be preferable to some users as compared to non- anti- aliased type. Rotated displays, in which the subpixels are arranged vertically rather than horizontally, are not currently supported. Using Clear. Type on these display configurations will actually reduce the display quality. The best option for users of Windows XP having rotated LCD displays (Tablet PCs or swivel- stand LCD displays) is using regular anti- aliasing, or switching off font- smoothing altogether. The software developer documentation for Windows CE states that Clear. Type for rotated screens is supported on that platform. A control panel applet is available to let the users tune the GDI Clear. Type settings. The GDI implementation of Clear. Type does not support sub- pixel positioning. A Microsoft Clear. Type tuner utility is available for free download for Windows versions lacking this facility. Microsoft Reader (for e- books) has its own Clear. Type tuner. Clear. Type in WPF. There are separate Clear. Type registry settings for GDI and WPF applications, but by default the WPF entries are absent, and the GDI values are used in their absence. WPF registry entries can be tuned using the instructions. WPF supports aggressive caching of pre- rendered Clear. Type text in video memory. Direct. X 1. 0 cards will be able to cache the font glyphs in video memory, then perform the composition (assembling of character glyphs in the correct order, with the correct spacing), alpha blending (application of anti- aliasing), and RGB blending (Clear. Type's sub- pixel color calculations), entirely in hardware. This means that only the original glyphs need to be stored in video memory once per font (Microsoft estimates that this would require 2 MB of video memory per font), and other operations such as the display of anti- aliased text on top of other graphics – including video – can also be done with no computation effort on the part of the CPU. Direct. X 9 cards will only be able to cache the alpha- blended glyphs in memory, thus requiring the CPU to handle glyph composition and alpha- blending before passing this to the video card. Caching these partially rendered glyphs requires significantly more memory (Microsoft estimates 5 MB per process).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
November 2017
Categories |