images

images1.1.2submission detailssubmitted by#074 Nissim Raj AngdembayAS-C

submitted toEr. Rajan Karmacharya

1.1.22contentImagesPixelResolutionCalculation of ResolutionGraphics Classification

Bitmap ImageRaster GraphicsVector GraphicsVectors NomenclatureRaster vs. Vector

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imageAn image is a visible impression obtained by a camera-device which is displayed on a computer or screen. An image is displayed on a screen using a combination of pixels.

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pixelA pixel is a minute area of illumination on a display screen, one of many from which an image is composed. Pixels can also be defined as the smallest component of an image that can be displayed.Inside the computer, pixels are generally assigned a value using binary and are represented as dots, rather than squares.5

resolutionResolution is the measurement of pixel density; that is, pixels per a unit square. The higher the resolutions, the more the pixels and hence sharper the image.Some notable resolutions include 720p, 1080p, 1080i etc.6calculation of resolutionResolution is calculated by counting the number of dots or pixels per a unit area.

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graphics classificationGraphics may be classified into two core types: Bitmap: A representation in which each item corresponds to one or more bits of informationVector: A type of graphical representation using lines to construct the outlines of objects8

bitmap imageA bitmap image is an image mapped from some domain tobits (values which are 0 and 1). This collection of bits form an image.

This is also called abit array.

9In a bitmap image, the image is composed of a matrix of individual dots which have some information (like colour). These are arranged to make up an image.

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raster graphicsAraster graphicimage is adot matrix data structure representing a generallyrectangular grid ofpixels viewable via adisplay medium.The more the number of bits, the better the image quality for more information is encoded. However, the image size significantly increases.11

vector graphicsVector graphicsis the use ofgeometrical primitivessuch aspoints,lines,curves, andshapesorpolygonsall of which are based on mathematical expressionsto representimages.Vectors images are more flexible because they can be compressed or stretched without any loss of information.

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In vector graphics, the file that results from a graphic artist's work is created and saved as a sequence of vector statements.Instead of containing a bit in the file for each bit of a line drawing, a vector graphic file describes a series of points to be connected.Vector graphics are very large in size because each property of the object is defined. 13vectors nomenclatureDrawing Objects: a geometric component of a vector graphicProperties: specifications of a graphic such as thickness of a lineDrawing List: the list of drawing commands that recreate a vector graphic.14raster vs vectorRaster graphics are usually suitable for displaying real-life images such as photography. Raster graphics dont define properties of an object, hence cannot be compressed or expanded without the loss of data.Vector graphics are usually suitable for displaying computer-generated pictures such as icons. Vector graphics can be expanded or compressed without the loss of data because the graphics is already encoded as mathematical and the computer simply draws.15The reason why raster graphics are used for photography is because raster graphics encode a colour value to each pixel, hence display richer colours and better flexibility. Raster graphics are also significantly smaller in size because the amount of bits can be controlled.Vectors cannot do this because each property of the object must be defined, which results in the image being less-flexible and cartoonish. Vector graphics are significantly bigger due to more information being in it.16questions?17thank you!18