101 lines
3.7 KiB
HTML
101 lines
3.7 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Luminance HDR User Manual — Tonemapping operators reference — Mantiuk'08</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<link href="style.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<h2>Mantiuk'08</h2>
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<p>This operator
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applies the display adaptive tone mapping, which attempts to
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preserve contrast of an input (HDR) image as close as
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possible given the characteristic of an output display. Use
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this tone mapping operator if you want to preserve original
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image appearance, or slightly enhance contrast while maintaining
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the natural look of images. The
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operator can also compensate for ambient light reflections
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on a screen, and for varying dynamic range and brightness of
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a display. The operator is suitable for video sequences as
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it prevents high-frequency changes in tone-curve between
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consecutive frames, which would result in flickering. Note
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that the temporal filtering is always active and there is no
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need to specify an argument to switch it on.</p>
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<table width="100%" border="0" rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="0%"></td>
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<td width="0%">
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<p style="margin-top: 1em">More details can be found
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in:</p> </td>
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<td width="45%">
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</td></tr>
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</table>
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<p style="margin-left:11%;">Rafal Mantiuk, Scott Daly and
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Louis Kerofsky. <br>
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Display Adaptive Tone Mapping. <br>
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In: ACM Transactions on Graphics 27 (3), 2008. <br>
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http://www.mpi-inf.mpg.de/resources/hdr/datmo/</p>
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<p style="margin-left:0%; margin-top: 1em">If you find
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this TMO useful in your research project, please cite the
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paper above.</p>
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<table width="100%" border="0" rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="0%"></td>
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<td width="0%">
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<p style="margin-top: 1em">This operator also employs color
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correction mechanism from:</p></td></tr>
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</table>
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<p style="margin-left:11%;">Radoslaw Mantiuk, Rafal
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Mantiuk, Anna Tomaszewska, Wolfgang Heidrich. <br>
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Color Correction for Tone Mapping. <br>
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In: Computer Graphics Forum (Proc. of
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EUROGRAPHICS’09), 28(2), 2009. <br>
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http://zgk.wi.ps.pl/color_correction/</p>
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<p>The result of
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this TMO does not usually require gamma correction.</p>
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<h3>OPTIONS</h3>
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<DT><B>Color Saturation</B><DD>
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<p>
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Decrease or increase color saturation after tone mapping. Default
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value <B>1</B> attempts to preserve color appearance of the original
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image. Use values >1 to increase and <1 to decrease color saturation.
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<DT><B>Contrast Enhancement</B><DD>
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<p>
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By default this tone-mapper attempts to preserve contrast of an input
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image. This parameter controls whether the contrast of an
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input image should be enhanced before tone-mapping. For example
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<B>1.15</B> boosts contrast by 15%. Note that if a target display
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does not offer sufficient dynamic range, contrast may be enhanced only
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for selected tone-values (those that dominate in an image) or not
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enhanced at all.
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<DT><B>Luminance Level</B><DD>
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<p>
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Tells the
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tone-mapper what luminance level in the input image should be mapped
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to the maximum luminance of a display. Since HDR images contain only
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relative luminance information, tone-mapper does not know how bright
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should be the scene. This option is meant to fix this problem by
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providing tone-mapper with the information what luminance level in an
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input image should be perceived as a diffuse white surface. Default is
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<I>none</I>, which means that no such mapping will be enforced and
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tone-mapper is free to find an optimal brightness for a given
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image. This is a recommended setting for HDR images.
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</body>
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</html>
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