How does Pixel creates Image? Fact File 6


In Computer based Image creation, Raster image is used which is the data structure that represents a rectangular grid of Pixels or Points of colour that can be viewed on the Monitor. Raster image is also called as Bitmap which consists of single points called Pixel or Picture element. The number of pixels in the image represents its resolution. The pixel can be considered as the smallest portion of the digital image. It also denotes the unit of measurement of the resolution such as 1200 pixels.Let us see its creation.

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Digital TV Technology


In contrast to the ordinary TV, Digital TV or DTV uses the transmission in Digital format. Digital TV supports various types of picture formats of different combination size and interlacing. The digital format may be High Definition TV (HDTV) or Standard Definition TV (SDTV). HDTV transmission is in p720 (720 Progressive scanning) or i1080 (1080 interlace). Both use the 16:9 Aspect ratios. HDTV format cannot be transmitted through analog channels. SDTV on the other hand uses different formats based on different aspect ratio.

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Digital TV Technology


In contrast to the ordinary TV, Digital TV or DTV uses the transmission in Digital format. Digital TV supports various types of picture formats of different combination size and interlacing. The digital format may be High Definition TV (HDTV) or Standard Definition TV (SDTV). HDTV transmission is in p720 (720 Progressive scanning) or i1080 (1080 interlace). Both use the 16:9 Aspect ratios. HDTV format cannot be transmitted through analog channels. SDTV on the other hand uses different formats based on different aspect ratio.

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Image Formats


Different forms of file formats are used in computing to create image files. The most common image files are JPEG (Joint Photographic Expert Group), PNG (Portable Network Graphics) GIF (Graphics Interchange Format) TIFF (Tagged Image File Format) etc. These file formats are based on compression algorithm to create realistic scenes and pictures. But based on the file formats the colour quality, transparency and resolution of images vary.


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Pixel


Pixel or Picture element is the term used to describe a single point in a Raster image. The Raster image, also called Bitmap is the data structure that represents a rectangular grid of pixels or points of colour that can be viewed in a monitor. The number of pixels in the image represents its resolution. The pixel can be considered as the smallest portion of the digital image. It also denotes the unit of measurement of the resolution such as 1200 pixels.

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Digital Microscope


Digital Microscopy is the advanced technology that uses a CCD camera to output the image into a computer monitor. The major difference between the digital microscope and the conventional optical microscope is that, the image cannot be viewed directly through the eye piece lens.Image is output to a computer to view it on the screen . Low priced digital microscope and costly one are available to use in conjunction with a computer.

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Liquid Crystal Display


An LCD basically consists of two glass plates with some liquid crystal material between them. The LCD has an electrically controlled light polarising liquid trapped in cells between two transparent polarising sheets. The polarising axes of the two sheets are aligned perpendicular to each other. Each cell in the LCD has electrical contacts that permit an electric field into the liquid present inside the LCD cell.

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