Federal Agencies
Digitization Guidelines Initiative

Home > Glossary > I > Image state

Term: Image state

 “Search Glossary” button searches only the glossary. Temporary note: search not enabled for two- and three-character terms; browse by alphabet.
 “Search“ button at the top right of the page searches the Web site, not the glossary.

Suggest a term

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Term: Image state

During the last few years, imaging specialists have refined the concept of image states and, in 2004, this concept was described and defined in the international standard Photography and graphic technology—Extended Colour encodings for digital image storage, manipulation, and interchange (ISO 22028-1). At the highest level, there are two states: scene-referred, which "represents estimates of the color-space coordinates of the elements of a scene," and picture-referred, which "represents the color-space coordinates of the elements of a hardcopy or softcopy image." The latter state has two subcategories: original-referred, which is "typically produced by scanning artwork," and output-referred, an image "that has undergone color-rendering appropriate for a specified real or virtual output device and viewing conditions." In turn, output referred is further divided into reference-output-referred (related to ICC Profile Connection Space or PCS) and actual-output-referred (actual device constrained, e.g., CMYK color space). There do not appear to be well-established metadata conventions for expressing these states, nor do there appear to be file headers (or other structures) in which to inscribe such data. At this Web site, the concept of image state is extended to include grayscale as well as color imagery.
"Perceptual Rendering Fundamentals," ICC White Paper by Ann McCarthy and others
See also: