What is ISO/TR 20791‑1 - Evaluation methods of image quality about?
ISO/TR 20791‑1 provides information and examples of measurement methods for evaluating the image quality of digital photographic reflection prints, including prints produced by inkjet, thermal dye transfer, electrophotography, and silver halide (chromogenic) technologies. These measurement methods are intended especially to be applicable to small prints with a size of available picture area ranging from 35 mm × 45 mm to 360 mm × 450 mm, a popular and basic application of photographic print technology.
NOTE: The definition of “digital print” here is a print made directly from digital data when there is no intermediate image carrier, or when the image carrier is refreshed for each impression, and thus each impression can be different in content if desired.
Who is ISO/TR 20791‑1 - Evaluation methods of image quality for?
ISO/TR 20791‑1 on evaluation methods of image quality is useful for:
- Photographers
- Cinematographers
- Image quality accessors
- Photographic application manufactures
Why should you use ISO/TR 20791‑1 - Evaluation methods of image quality?
The image quality of photographic prints is not based on any single feature but instead involves several factors. There are so-called “five major properties” for representing photographic image quality, and each one is essential: (1) density; (2) color; (3) uniformity (4) tone, and (5) detail reproduction.
Glossiness represents another important factor. It affects the observer’s perception since it relates to the light specularly reflected from prints. Though the specularly reflected light contains no information from the printed image, it affects the observer’s perception. Furthermore, the sharpness of the shape of reflected light sources also affects the perception.
ISO/TR 20791‑1 provides information about the measurement methods for image quality that are applicable to photographic prints, including digital prints produced using a range of printing technologies.
