What is image quality?

The perceived quality of an image is the end result of a long chain of components.

Typical ‘chain’ of factors

                    Fig 24

A typical ‘chain’ determining image quality might include: the signal source (e.g. the graphic adaptor in a PC or a video camera); all the electronic components for signal processing, storing, switching etc; all the cables in a system; all the connectors in a system; the display device itself; the ‘output’ from the display as ‘controlled light’, entering our perception system via the optic nerves in the human eye.


The display device itself is critical to image quality, combining factors such as: resolution; sharpness; colour reproduction; uniformity; contrast ratio; pixellation (in the case of pixel based display devices, such as LCD projectors); and dynamics (coping with moving images) etc.


The perceived result can be no better than the weakest link in the chain.

One important factor for ensuring the best possible perceived image quality is controlling the field of vision, i.e. the surroundings of the screen.


By ensuring that the image surroundings do not have a high luminance value, i.e. preferably muted colours, black masking of the image, avoiding reflective surfaces etc, the perceived image quality will be significantly improved.

Key to image quality

  • Adjust the amount of information according to purpose of the display
  • Optimize size and viewing angles
  • Optimize image brightness according to ambient light level
  • Control the field of view if possible
  • Optimize signal source and projector
  • Optimize contrast

dnp denmark is the worldwide large-screen centre of Dai Nippon Printing Co. Ltd. With a 65 % market share, dnp is the world’s leading supplier of optical projection screens for high quality display solutions.

The dnp optical screen portfolio includes an extensive range of optical projection screens for both front and rear projection screen applications for all environments including home cinema / home theatre, meeting rooms / conference rooms, control rooms, signage & advertising and more.

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