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Anonymous
There's a method/algorithm for improving sharpness and reducing noise that is based on combining multiple images of the same object. Anyone know what it's called or any, preferably free, software that use it?
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>> ilkore !!rybbb5OcRVp
It's called image stacking/averaging. I use to use one called imgstack.

You can do this in photoshop, if you take pictures in multiples of 8. What you do, is you place each of the 8/16/24 images, in their own layer. Then, starting from the top, make every other layer 50% opacity. then you merge each of those 50% layers down, with the layer immediately below them... now you should have 4 layers. you then repeat the process, until you end up with just one layer.
>> ilkore !!rybbb5OcRVp
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I made some examples. Just make sure you have a solid tripod, and set your camera on manual exposure, and white balance.

These are 300 percent crops, before any pp, other than the averaging of the images. 16 images combined.

Camera-Specific Properties:Equipment MakeCanonCamera ModelCanon EOS DIGITAL REBEL XTCamera SoftwareAdobe Photoshop CS3 WindowsImage-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution72 dpiVertical Resolution72 dpiImage Created2008:08:24 23:46:43Exposure Time1/125 secF-Numberf/16.0Exposure ProgramManualISO Speed Rating1600Lens Aperturef/16.0Exposure Bias0 EVMetering ModePatternFlashNo Flash, CompulsoryFocal Length50.00 mmColor Space InformationsRGBImage Width600Image Height300RenderingNormalExposure ModeManualWhite BalanceManualScene Capture TypeStandard
>> ilkore !!rybbb5OcRVp
     File :-(, x)


Camera-Specific Properties:Equipment MakeCanonCamera ModelCanon EOS DIGITAL REBEL XTCamera SoftwareAdobe Photoshop CS3 WindowsImage-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution72 dpiVertical Resolution72 dpiImage Created2008:08:24 23:44:42Exposure Time1/125 secF-Numberf/16.0Exposure ProgramManualISO Speed Rating1600Lens Aperturef/16.0Exposure Bias0 EVMetering ModePatternFlashNo Flash, CompulsoryFocal Length50.00 mmColor Space InformationsRGBImage Width628Image Height314RenderingNormalExposure ModeManualWhite BalanceManualScene Capture TypeStandard
>> ilkore !!rybbb5OcRVp
     File :-(, x)


Camera-Specific Properties:Equipment MakeCanonCamera ModelCanon EOS DIGITAL REBEL XTCamera SoftwareAdobe Photoshop CS3 WindowsImage-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution72 dpiVertical Resolution72 dpiImage Created2008:08:24 23:42:43Exposure Time1/125 secF-Numberf/16.0Exposure ProgramManualISO Speed Rating1600Lens Aperturef/16.0Exposure Bias0 EVMetering ModePatternFlashNo Flash, CompulsoryFocal Length50.00 mmColor Space InformationsRGBImage Width1000Image Height1000RenderingNormalExposure ModeManualWhite BalanceManualScene Capture TypeStandard
>> Anonymous
     File :-(, x)
>>241960

Wow, this is awesome.

Thanks.

This was shot on an S5 at ISO800. A hell of a cleanup job.

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>> NatureGuy !se3A3TwzdY
imagine doing this with long exposures....
>> Anonymous
this is retarded, if you can make multiples images of the same static object, why dont you set a longer exposure time, using a lower iso?
>> ac !!VPzQAxYPAMA
>>243517
>this is retarded, if you can make multiples images of the same static object, why dont you set a longer exposure time, using a lower iso?
Think small-sensor digicams with noisy ISO50.
>> Anonymous
>>243519

you have to be really doing it wrong to get noise at a camera's base iso

unless you're doing 60 seconds+ exposures
>> Anonymous
>>243523small fix

yes, even on "small-sensor digicams"
>> ilkore !!rybbb5OcRVp
>>243517
image stacking is usually used in astrophotography/micrography. that photoshop method, was taught to me by an ex-hubble-engineer-turned-amateur-photographer. but even at your digicams lowest iso, it will still be beneficial; especially so, if you are doing a long exposure.

you can also use the imgstack program, for creating a long exposure on a p&s that doesn't allow long exposures... if you take 20 images at 1/20.. it can take the data and add it together, while averaging the noise out, and keeping the black values, it will create a long exposure.

this method could also be used artistically if you want to take a long exposure of a cityscape, but you don't want any car lights traveling through it... you could just take photos when there aren't cars present, and add them together later.
>> Anonymous
>>241960You can do this in photoshop, if you take pictures in multiples of 8. What you do, is you place each of the 8/16/24 images, in their own layer. Then, starting from the top, make every other layer 50% opacity. then you merge each of those 50% layers down, with the layer immediately below them... now you should have 4 layers. you then repeat the process, until you end up with just one layer.

wait so

1-50%
2-100%
3-50%
4-100%
5-50%
6-100%
7-50%
8-100%

then you wind up with

1+2-50%
3+4-100%
5+6-50%
7+8-100%

merge to give

1+2+3+4
5+6+7+8

then

1+2+3+4-50%
5+6+7+8-100% and final merge?
>> Anonymous
>>243527this method could also be used artistically if you want to take a long exposure of a cityscape, but you don't want any car lights traveling through it... you could just take photos when there aren't cars present, and add them together later.

i don't get that part
>> ilkore !!rybbb5OcRVp
>>243535
yup