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RAW average: interesting examples here!

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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #10 on: 04 / March / 2008, 14:32:45 »
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I'm not 100% sure but I think I left it to the default AUTO setting.
I'm still not sure about the differences and which one is best to use and in which cases...
In the future I'll try with higher ISO settings even if it doesn't make lot of sense
since averaging requires a tripod, so it's useless to use faster shutter speeds,
all you'll get will be noiser pictures, so you'll need more of em to average, not quite a good deal!
« Last Edit: 04 / March / 2008, 14:34:54 by gabriele »

RAW average: Canon EOS Cameras?
« Reply #11 on: 05 / March / 2008, 16:04:58 »
Gabriele,

Have you seen any RAW average tests done with a EOS camera?  Or have you thought of doing them yourself?  Am wondering if RAW average will be as effective with these cameras as it is with the PowerShots?

Thanks

Gene

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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #12 on: 05 / March / 2008, 16:08:38 »
If I had a digital reflex I'd surely try...too bad I don't!
I have a reflex camera, but it's a totally manual Minolta SRT-101...30 and more years old,
that's what I call RAW! ;-)

Now I was wondering...how to calculate the RAW average using the PC instead
of the camera saving precious battery life and time?
« Last Edit: 05 / March / 2008, 16:14:56 by gabriele »

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Offline lukg

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Re: RAW average: interesting examples here!
« Reply #13 on: 05 / March / 2008, 19:28:07 »
I'm not 100% sure but I think I left it to the default AUTO setting.
I'm still not sure about the differences and which one is best to use and in which cases...
In the future I'll try with higher ISO settings even if it doesn't make lot of sense
since averaging requires a tripod, so it's useless to use faster shutter speeds,
all you'll get will be noiser pictures, so you'll need more of em to average, not quite a good deal!

Yes it make sense because sometimes in bad light condition you could not use long exposures and taking just one pic. (eg. a street with fitful walking people).
And if it's possible, sometimes long exposures give strange colors if the light is too weak. The only option is higher ISO (and tripod of course for the alignment). But with higher ISO pics are horrible :D.
Averaging them lets you to eliminate an important part of disgusting "random" noise, tipical of higher Iso setting.
In the "zero noise" thread you could see some example using 400 and 800 iso and averaging 8-10 jpgs (not directly in the camera of course).
Well I was just curious to see Raw averaging behaviour, just to see how many details RAW can retain in such situation. (since my test are based only on compressed jpgs with camera noise reduction) :D
I want chdk for my camera too  :'(
:D Thanks!!!


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Offline lukg

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Re: RAW average: interesting examples here!
« Reply #14 on: 05 / March / 2008, 19:32:50 »
Now I was wondering...how to calculate the RAW average using the PC instead
of the camera saving precious battery life and time?

You can use photomatix in batch mode (you need to convert raw to DNG I suppose).
Or in photoshop, but it's a manual procedure...too boring! You have to create a layer for each picture, giving the first layer 100% transparency, the second one 50%, the third 25%, and so on....what you obtain is the averaged pic!

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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #15 on: 05 / March / 2008, 19:58:23 »
it would be nice to have a simple executable program that uses the same process that is in CHDK to get an average of several RAW pictures, can this be done?
Developersssssssss! Help! We need a porting 2 Win and Linux of that function! Just a simple interface to select the pictures and if using the average or the sum of the pictures and then it's done.

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Offline ewavr

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Re: RAW average: interesting examples here!
« Reply #16 on: 06 / March / 2008, 04:00:44 »
it would be nice to have a simple executable program that uses the same process that is in CHDK to get an average of several RAW pictures, can this be done?

DNG4PS 1.1.4 includes NMerge program (with sources) to make RAW(DNG) sum.

Also in attachment is prototype (for PC) of CHDK RAW average/sum program.
« Last Edit: 06 / March / 2008, 04:05:53 by ewavr »

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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #17 on: 06 / March / 2008, 04:31:44 »
Thanks a lot ewavr!
I didn't know because I use DNG4PS2 ::)


Re: RAW average: interesting examples here!
« Reply #18 on: 07 / March / 2008, 13:44:58 »
Gabriele,

As a CHDK Newbie I have been reading the CHDK wiki and am very interested in the "ISO Override provides expanded ISO selection by allowing one to set an arbitrary ISO value."

Have you tried it ?  If so what was the lowest ISO you were able to get on your camera?

Am also wondering what the effect of going to ISO 50 would be on  RAW average results?

Gene

Re: RAW average: interesting examples here!
« Reply #19 on: 07 / March / 2008, 17:51:07 »
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