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•Lossless compression With loss less compression, data is

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Thomas Mallen

on 28 April 2014

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Transcript of •Lossless compression With loss less compression, data is

Image Compression Techniques
& Image file formats
Lossless compression is a technique of compression in which data is compressed without any loss of data, the compression style assumes that you want everything back that you have compresses therefore none is lost. this means images can be can be compressed without loss of quality but change in file size.
Lossless Compression
Lossy compression
There are two different categories for compression techniques used with digital graphics, lossy and lossless. Both use different techniques to compress file however they both have the same aim.
RGB and CYMK
Airbrushing

Dots Per Inch
Vector And Raster
Airbrushing is a technique used on editing software such as Photoshop to enhance and make the aesthetics of photos better. Often Airbrushing is often used on people to make them look better in the Photoshop and make the photo more attractive. Airbrushing is often used on Photoshop for adverts such as magazine covers , film covers etc.
DPI stands for ‘Dots Per Inch’. Dots per inch is used to measure resolution of an image both on screen , prints and scanners. Monitors do not have dots, but use pixels instead, which are alike to the dots concept. For monitors and images it is pixels per inch or PPI.

RGB- RBG is a colour models in which red, blue and green lights are added together to product a variety of other colours this technique is often used on most devices such as televisions and computer monitors. RGB is used as it is an easy technique to create a vast amount of colours. RGB is also used within photography.
CMYK- CMYK is a color model that consists of cyan, magenta, yellow, and key (black). CMYK is a colour model that typically used for printing. Within photography this colour model will have been used within the printing of high quality images and this model will help achieve this high quality
Vector Graphics- Vector graphics is the use of geometrical shapes such as lines ,curves ,polygons, and basic shapes which are all based on mathematical expressions, to represent images in computer graphics

Raster Graphics- A raster graphics image is a dot matrix structure representing a rectangular grid of pixels.

Raster graphics are based on pixels so when there is a change in scale or size there is loss of quality and clarity, while vector based graphics can be changes in scale or size without distortion or loss of clarity.
With the technique of lossy compression the compression techniques doesn't keep all the data therefore some is deleted of lost this cause images to become distorted and have worse resolution. This data that is lost may be in the form of colour depth of the graphical detail. For example a high quality image can be distorted and have colour change due to the compression.

Bitmap
Bitmap is a set of bits that represent graphic images, with each ‘bit’ corresponds to a pixel in an image. A bitmap is a type of memory organisation that is used to store images, therefore images are put together in bits to for the image. If a bitmap image is resize of re scaled it does easily become distorted.
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