HDR compression - Revision history

Erik Krause: marked as out of date

2008-09-21T21:37:17Z

marked as out of date

Erik Krause: Prepared for new glossary template

2007-11-17T23:20:11Z

Prepared for new glossary template

Imroy: copyedit

2007-09-24T13:21:35Z

copyedit

Erik Krause: 1 revision(s)

2007-03-21T18:09:02Z

1 revision(s)

Erik Krause: re-categorized

2007-03-21T18:07:00Z

re-categorized

Erik Krause: re-categorized

2007-03-18T16:33:49Z

re-categorized

Erik Krause: /* Intro */ typo

2007-03-18T16:32:30Z

‎Intro: typo

Bruno: linkified

2006-08-26T23:39:14Z

linkified

Bruno: linkified

2006-08-18T16:05:41Z

linkified

Bruno: switched photomatix link

2006-08-18T10:53:06Z

switched photomatix link

← Older revision		Revision as of 21:37, 21 September 2008
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	[[Category:Glossary]]		[[Category:Glossary]]
	[[Category:Software:Survey]]		[[Category:Software:Survey]]
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		+	{{Outdated}}

← Older revision		Revision as of 23:20, 17 November 2007
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		+	{{Glossary\|The compression of the [[dynamic range\|Dynamic Range]] in order to be displayed on a low dynamic range device like monitor or printer.}}
	With [[Photoshop]] CS2 it has become very easy to create true [[HDR]] (high [[dynamic range]]) images from [[Bracketing\|bracketed]] exposure series. There is a nice tutorial by Brian Greenstone on how to assemble multiple exposures into one HDR file: [http://www.panomundo.com/panos/howto/workflow_expbracketing.html]		With [[Photoshop]] CS2 it has become very easy to create true [[HDR]] (high [[dynamic range]]) images from [[Bracketing\|bracketed]] exposure series. There is a nice tutorial by Brian Greenstone on how to assemble multiple exposures into one HDR file: [http://www.panomundo.com/panos/howto/workflow_expbracketing.html]

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 With [[Photoshop]] CS2 it has become very easy to create true [[HDR]] (high [[dynamic range]]) images from [[Bracketing|bracketed]] exposure series. There is a nice tutorial by Brian Greenstone on how to assemble multiple exposures into one HDR file: [http://www.panomundo.com/panos/howto/workflow_expbracketing.html]
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 Many thanks to Raanan Fattal for letting me use his Belgium House HDR image: [http://www.cs.huji.ac.il/~danix/hdr/results.html]
-=== FDRCompressor ===
+== FDRCompressor ==
 [[Image:fdr-dialog.jpg|thumb|300px|FDRCompressor plugin]]
 [[Image:belgium-fdr.jpg|thumb|300px|FDRCompressor result - Image courtesy of Raanan Fattal]]
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 If the image comes out a bit flat with low contrast, this is because it is still 32 bit per channel and has to be reduced to 16 or 8 bit and the black and white point have to be set. The black and white point adjustment is best done in L*a*b color space in order to preserve color saturation.
-In this case no white and black point setting was necessary. The general appearance is good. No visible [[halo|halos]], detail contrast is ok, no reversed gradients, no artifacts.{{clr}}
+In this case no white and black point setting was necessary. The general appearance is good. No visible [[halo]]s, detail contrast is ok, no reversed gradients, no artifacts.{{clr}}
-=== Photomatix Tone Mapping ===
+== Photomatix Tone Mapping ==
 [[Image:photomatix-dialog.jpg|thumb|300px|Photomatix Tone Mapping]]
 [[Image:belgium-photomatix.jpg|thumb|300px|Photomatix result - Image courtesy of Raanan Fattal]]
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 The general appearance is pretty good at the first glance, with good contrast for the outside scene and no reversed gradients.
-At a closer look it shows little artifacts and some [[halo|halos]] - the door frame is too dark where the bright column is behind. If you look at http://www.hdrsoft.com/ this could be a general problem of photomatix. The result resembles a bit the [http://www.cs.huji.ac.il/~danix/hdr/pages/belgium.html original Gradient Domain HDR compression result] of Fattal, Lischinski and Werman.
+At a closer look it shows little artifacts and some [[halo]]s - the door frame is too dark where the bright column is behind. If you look at http://www.hdrsoft.com/ this could be a general problem of photomatix. The result resembles a bit the [http://www.cs.huji.ac.il/~danix/hdr/pages/belgium.html original Gradient Domain HDR compression result] of Fattal, Lischinski and Werman.
 {{clr}}
-=== Conclusion ===
+== Conclusion ==
 The two plugins are very powerful tools for compression of real high dynamic range images like it would not have been possible only short time ago. They can compete with the most recent research on that topic.
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 The results are very similar, both have been sharpened slightly (the source images are a bit blurry). It is meaningless to compare the differences in contrast in my example - they most likely can be avoided or enhanced by choosing better parameters. More experience is needed here.
-What is hardly avoidable by parameters are [[halo|halos]] and artifacts. The Photomatix result shows some of them: Dark [[halo|halos]] around the door and on the door frame. Light [[halo|halos]] around the plant leaves left and above the window in the opposite wall. A coarse structure in uniform areas of the inside wall, especially left and above the door.
+What is hardly avoidable by parameters are [[halo]]s and artifacts. The Photomatix result shows some of them: Dark [[halo|halos]] around the door and on the door frame. Light halos around the plant leaves left and above the window in the opposite wall. A coarse structure in uniform areas of the inside wall, especially left and above the door.
 The FDRCompressor result does not show those flaws. The only critics from my side would be that it is harder to master than photomatix. The response if you change values is slow and the values are not intuitive. Preview is too small and does often not resemble the final result.

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 <small>--[[User:Erik Krause|Erik Krause]] 16:06, 9 Dec 2005 (EST)</small>
-[[Category:Tutorial]][[Category:Tutorial:Specialised]]
+[[Category:Tutorial:Specialised]]
 [[Category:Software:Platform:Windows]]
 [[Category:Glossary]]
 [[Category:Software:Survey]]

← Older revision		Revision as of 16:33, 18 March 2007
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	[[Category:Glossary]]		[[Category:Glossary]]
		+	[[Category:Software:Survey]]

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 With [[Photoshop]] CS2 it has become very easy to create true [[HDR]] (high [[dynamic range]]) images from [[Bracketing|bracketed]] exposure series. There is a nice tutorial by Brian Greenstone on how to assemble multiple exposures into one HDR file: [http://www.panomundo.com/panos/howto/workflow_expbracketing.html]
-He describes the necessary steps to compress the high dynamic range with photoshop built in "Local Adaption", too. However, sometimes it is very hard to get decent results this way. Two HDR compression plugins are now available for this purpose. '''[[Photomatix]] Tone Mapping''' plugin from HDRSoft and '''FDRCompressor''' from [[FDRtools]].
+He describes the necessary steps to compress the high dynamic range with photoshop built in "Local Adaption", too. However, sometimes it is very hard to get decent results this way. Two HDR compression plugins are now available for this purpose. '''[[Photomatix]] Tone Mapping''' plugin from HDRSoft and '''FDRCompressor''' from [[FDRTools]].
 Both plugins can be used on 16 or 8 bit per channel images, too. See [[RAW dynamic range extraction]] on how to extract the full dynamic range of a RAW file into a single 16 bit file.

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 === Intro ===
-With [[Photoshop]] CS2 it has become very easy to create true [[HDR]] (high [[dynamic range]]) images from bracketed exposure series. There is a nice tutorial by Brian Greenstone on how to assemble multiple exposures into one HDR file: [http://www.panomundo.com/panos/howto/workflow_expbracketing.html]
+With [[Photoshop]] CS2 it has become very easy to create true [[HDR]] (high [[dynamic range]]) images from [[Bracketing|bracketed]] exposure series. There is a nice tutorial by Brian Greenstone on how to assemble multiple exposures into one HDR file: [http://www.panomundo.com/panos/howto/workflow_expbracketing.html]
 He describes the necessary steps to compress the high dynamic range with photoshop built in "Local Adaption", too. However, sometimes it is very hard to get decent results this way. Two HDR compression plugins are now available for this purpose. '''[[Photomatix]] Tone Mapping''' plugin from HDRSoft and '''FDRCompressor''' from [http://fdrtools.com/ FDRtools].