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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html>
+ <head>
+ <title>Input vs. Output Referred images</title>
+ <meta http-equiv="content-type" content="text/html;
+ charset=windows-1252">
+ </head>
+ <body>
+ <h2 style="text-decoration: underline; font-weight: bold;">Input vs.
+ Output Referred Images<br>
+ </h2>
+ A lot of Photography related sources recommend that images be
+ encoded in a large gamut colorspace such as ProPhoto, but don't
+ explain the implications of doing this in in the process of
+ subsequently displaying such photo's. <br>
+ <h3> Input referred:</h3>
+ Images are encoded in a way that represents their unchanged or
+ originally captured values, in an encoding space that is larger
+ enough to store their gamut without clipping. The gamut of the
+ encoding space tells you nothing about the gamut of the images.<br>
+ <br>
+ Typical: L*a*b*, Raw, ProPhoto, RIMM etc.<br>
+ <h3>Output referred:</h3>
+ Images are modified (i.e. rendered) to fit within the gamut of a
+ specific real world output device (such as display or printer). This
+ means that typically the encoding space is a good representation of
+ the gamut of the images.<br>
+ <br>
+ Typical sRGB, AdobeRGB, printer profile, display profile, etc.<br>
+ <br>
+ <br>
+ Before displaying images that are Input Referred, they need to be
+ rendered to a smaller gamut. This may be done manually by adjusting
+ the images carefully to fit within the smaller gamut, or in some
+ automatic fashion such as by hard clipping them to the smaller
+ gamut, or by setting up a specific gamut mapping for each image or
+ set of images that occupy a similar gamut.<br>
+ <br>
+ <u><b>Note</b></u> that setting up a gamut mapping from the very
+ large Input referred encoding gamut to the smaller output device
+ gamut will almost certainly result in a disappointing loss of
+ saturation, because the images deliberately do not occupy the large
+ encoding gamut, and so get unnecessarily squashed down to allow for
+ colors that they do not actually contain.<br>
+ <br>
+ See also Scenarios.html#LP3.<br>
+ </body>
+</html>