Tone Mapping

ArchRival · 26th July 2009

Wanted to share the results of a personal project i've been working on for sometime now, off and on. Supposed to be the tone-mapping module for a HDR code. Took awhile to tweak it right, and now i've got something fun to play with

LeDave · 27th July 2009

can you give me step by step on how to do it? And how did oyu manage to get everything else to change except for people. Also is there a way to leave the sky alone without tonemapping it?

ArchRival · 27th July 2009

The program does local tone mapping. The little people are probably quite small and already well-contrasted, so not much mapping done on them.

I guess a problem with this picture is the blue sky taken through a polarizing filter. After mapping the sky appears almost black. Probably should not have used a polarizing filter on an image to be tone-mapped.

Anyway, two more tests. The first is a flash drive with a metal shell. Not much texture here, but the fingerprint on the metal is brought out after tone mapping. The second is a pair of excavators with lots of texture.

WuffRuff · 28th July 2009

Very nice! I love the effect.
Notice also how the badly overexposed hdb block in the 2nd photo showed all the details after tone-mapping. Tone-mapping can recover lost details to overexposed photos... cool!

Please share how this is done. I would like to learn how to do it too.

ArchRival · 30th July 2009

Dude, this was done with a c code. The buildings are not grossly overexposed, else there will be nothing there to recover.

More tests:

For comparison to original: http://i286.photobucket.com/albums/l...heelBurrow.gif

For comparison to original: http://i286.photobucket.com/albums/l...TombStones.gif

This is probably not a good candidate for tone mapping, since the original already has quite a lot of details.

A problem is posterization in areas with little detail. Need to work on this somemore.

ArchRival · 30th July 2009

100% crop of a 1296x1944 image.

LifeInMacro · 30th July 2009

Wow, your work (as in the coding of the TM module) is admirable...well, at least we all know now that photographers can write good software programs too!

Most happy to be your beta tester if you need any...

ArchRival · 9th August 2009

Did a few improvements to the code.

26th July 2009	#1
ArchRival Member Join Date: Sep 2006 Posts: 117	Tone Mapping Wanted to share the results of a personal project i've been working on for sometime now, off and on. Supposed to be the tone-mapping module for a HDR code. Took awhile to tweak it right, and now i've got something fun to play with

27th July 2009	#2
LeDave New Member Join Date: Jul 2009 Location: Minneapolis - St Paul Posts: 16	Re: Tone Mapping can you give me step by step on how to do it? And how did oyu manage to get everything else to change except for people. Also is there a way to leave the sky alone without tonemapping it?

27th July 2009	#3
ArchRival Member Join Date: Sep 2006 Posts: 117	Re: Tone Mapping The program does local tone mapping. The little people are probably quite small and already well-contrasted, so not much mapping done on them. I guess a problem with this picture is the blue sky taken through a polarizing filter. After mapping the sky appears almost black. Probably should not have used a polarizing filter on an image to be tone-mapped. Anyway, two more tests. The first is a flash drive with a metal shell. Not much texture here, but the fingerprint on the metal is brought out after tone mapping. The second is a pair of excavators with lots of texture.

28th July 2009	#4
WuffRuff Member Join Date: Jan 2007 Location: opp. East Coast Park Posts: 827	Re: Tone Mapping Very nice! I love the effect. Notice also how the badly overexposed hdb block in the 2nd photo showed all the details after tone-mapping. Tone-mapping can recover lost details to overexposed photos... cool! Please share how this is done. I would like to learn how to do it too. __________________ The best photographer is one who is inspired by the innate nature of his subjects.

30th July 2009	#5
ArchRival Member Join Date: Sep 2006 Posts: 117	Re: Tone Mapping Dude, this was done with a c code. The buildings are not grossly overexposed, else there will be nothing there to recover. More tests: For comparison to original: http://i286.photobucket.com/albums/l...heelBurrow.gif For comparison to original: http://i286.photobucket.com/albums/l...TombStones.gif This is probably not a good candidate for tone mapping, since the original already has quite a lot of details. A problem is posterization in areas with little detail. Need to work on this somemore.

30th July 2009	#6
ArchRival Member Join Date: Sep 2006 Posts: 117	Re: Tone Mapping 100% crop of a 1296x1944 image.

30th July 2009	#7
LifeInMacro Member Join Date: Aug 2008 Location: Singapore Posts: 353	Re: Tone Mapping Wow, your work (as in the coding of the TM module) is admirable...well, at least we all know now that photographers can write good software programs too! Most happy to be your beta tester if you need any... __________________ Family \| Health \| Happy-ness. . . my Flickr here

9th August 2009	#8
ArchRival Member Join Date: Sep 2006 Posts: 117	Re: Tone Mapping Did a few improvements to the code.