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Resolution requirements for digital images in dermatology
A Bittorf1, M Fartasch, G Schuler
1Department of Dermatology, University of Erlangen, Germany.
Background:
The digital image has become an important tool in dermatology because of the rapid development of computer hardware, networks, and the World Wide Web.
Objective:
Our purpose was to examine the resolution requirements for digital images.
Methods:
Slides of eight selected images showing characteristic lesions were produced in five different resolutions each, ranging from 192 x 128 x 24 (192 pixels x, 128 pixels y, and 24-bit color depth) up to 3072 x 2048 x 24. They were compared side by side by a group of six experienced dermatologists using a standardized questionnaire.
Results:
Images at the resolution of 768 x 512 x 24 were perceived as equivalent to higher resolutions, whereas a clear difference was visible between 768 x 512 x 24 and 384 x 256 x 24. The slide projector had a significant influence on the rating of the images.
Conclusion:
For digital images in dermatology a resolution of 768 x 512 x 24 is suitable to recognize the relevant details of the source image.
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