Data Compression


Criteria

Survey Formats

Basics

Compression Methods

Data Formats

Files

Audio Data

Image Data

GIF

JPEG

Characteristics

Fields of Application

Coding Steps

Compatibility

Video Data


Glossary

Index


Download


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JPEG: Characteristics


Considering a baseline process JPEG shows the following characteristics:


The data format is independent from resolution, aspect ratio and image contents.


The quality of the representation is individually configurable. Decreasing the quality requirements results in a smaller file size.


Image contents with a simple structure (monochromatic areas, regular patterns, a small amount of colours, etc.) lead automatically to smaller files.


The reduction of the image quality becomes visible by compression artifacts in form of a "raster". The size of these structures is 8 x 8 pixels, which first appear within areas of high complexity.


A reliable reproduction of colour information, e.g. for background colours, is not guaranteed at larger compression rates.


The compression of monochromatic images (e.g. b/w graphics, technical drawings, etc.) result frequently in clearly perceptible compression artifacts.


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JPEG JPEG JPEG: Fields of Application