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FORUMS Canon Cameras, Lenses & Accessories Canon G-series Digital Cameras 
Thread started 01 Oct 2010 (Friday) 18:09
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G12 HDR

 
flatsboy
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Oct 01, 2010 18:09 |  #1

I've been using AEB to produce 3 shots to import into Photomatrix with a resulting 8-9MB HDR JPG file. Using the G12's HDR you only end up with one file and it's about the same 2+MB size as the rest of the single shot files. Anyone have a clue how they do this ?




  
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rpolitsr
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Oct 01, 2010 18:44 |  #2

I have not seen the G12 yet and there is not a pdf manual in the Canon site yet.
My guess is that the HDR mode is processing the three shots inside the camera and delivering only the final jpg file, but I insist it is only my guess.


rafael
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racketman
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Oct 02, 2010 05:06 |  #3

does it actually work?


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dontcallmeash
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Oct 02, 2010 06:21 |  #4

flatsboy wrote in post #11016900 (external link)
I've been using AEB to produce 3 shots to import into Photomatrix with a resulting 8-9MB HDR JPG file. Using the G12's HDR you only end up with one file and it's about the same 2+MB size as the rest of the single shot files. Anyone have a clue how they do this ?

you can only do this two ways, in-camera processing of 2-3 shots taken at different exposure values (this is what some DSLRs can do) but the final image is prone to motion artifact unless you had the camera on a tripod.

or you can do some creative histogram and tone mapping in-camera, which can be accomplished with presets already built in before the image is conveted to a jpeg. there is a surprising amount of dynamic range in a digital RAW image file if you're willing to dig for it.




  
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Tammy ­ T
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Oct 02, 2010 10:30 |  #5

flatsboy wrote in post #11016900 (external link)
I've been using AEB to produce 3 shots to import into Photomatrix with a resulting 8-9MB HDR JPG file. Using the G12's HDR you only end up with one file and it's about the same 2+MB size as the rest of the single shot files. Anyone have a clue how they do this ?

File compression and/or throwing away image data. Just like when you convert RAW (or JPG) to JPG, you can specify the size of the output JPG file.

I guess the camera internal memory is small. The 3 shots it buffers must be small, so the final HDR image is small (and may even be compressed further to conserve space).

Now if what you meant to ask is the exact algorithm(s) used then I have no idea :D




  
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G12 HDR
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