Abstract
Approaches to determining the Tone Reproduction Curve (TRC) which provides the reliable transfer of visual information in typical conditions of the halftone gray scale compression in relation to dynamic range of a graphic original or input image file are overviewed. The issues of such curve realization are also analyzed with taking into account the specifics of multiple stages of illustrative printing technology.
Highlights
Problem of the shortened halftone scale is somewhat solved by digital High Dynamic Range (HDR) photography, where sections of the scene of very different average brightness after being captured at different exposures are seamlessly joined in the resulting image (Reinhard et al, 2010)
Replacing camera by electronic scanner allowed for manipulating the Tone Reproduction Curve (TRC) form highly flexibly and several scientific schools actively developed in the 70-ies the approaches to finding some optimal, universal curve suitable for "all cases" as the solution of cornerstone theoretical problem of print reproduction
The TRC form is set in attempt to achieve the identity of a copy not to original itself but, for example, to the imagined by operator, technologist or editor visual object which the original copy is only trying to convey
Summary
The brightness range of a print image is many orders of magnitude lower than for the outdoor objects. Problem of the shortened halftone scale is somewhat solved by digital High Dynamic Range (HDR) photography, where sections of the scene of very different average brightness after being captured at different exposures are seamlessly joined in the resulting image (Reinhard et al, 2010). These copies are not completely reliable and natural, because in the conditions of outdoor lighting, the observer isn’t able to simultaneously perceive all the gradations of such areas. Even after finding such a curve in the light of certain tone rendering intentions, the task of its practical implementation is no less urgent, taking into account the non-linearity of numerous stages of the printing process
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