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Two (not) identical A590IS

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Offline morel

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Two (not) identical A590IS
« on: 25 / January / 2011, 05:03:53 »
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I have two A590IS cameras, both with the same FW version, the same settings, CHDKs etc. So I have made remote USB controll and I do 3d photos with SDM. But now - even if I set everything the same on both cameras (f, time, WB, ISO) both photos are slightly different as you can see

http://foto3d.w8w.pl/prbl/IMG_0601L.JPG

Code: [Select]
Filename - IMG_0601L.JPG
Make - Canon
Model - Canon PowerShot A590 IS
Orientation - Left bottom
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
DateTime - 2011:01:22 13:49:26
YCbCrPositioning - Centered
ExifOffset - 196
ExposureTime - 1/200 seconds
FNumber - 5.00
ISOSpeedRatings - 100
ExifVersion - 0220
DateTimeOriginal - 2011:01:22 13:49:26
DateTimeDigitized - 2011:01:22 13:49:26
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 5 (bits/pixel)
ShutterSpeedValue - 1/202 seconds
ApertureValue - F 5.02
ExposureBiasValue - 0.00
MaxApertureValue - F 2.59
MeteringMode - Multi-segment
Flash - Flash not fired, compulsory flash mode
FocalLength - 5.80 mm
UserComment -
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 3264
ExifImageHeight - 2448
InteroperabilityOffset - 3178
FocalPlaneXResolution - 14506.67
FocalPlaneYResolution - 14485.21
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Manual
White Balance - Manual
DigitalZoomRatio - 1.00 x
SceneCaptureType - Standard

Maker Note (Vendor): -
Macro mode - Normal
Self timer - Off
Quality - Superfine
Flash mode - Not fired
Sequence mode - Single or Timer
Focus mode - Single
Image size - Large
Easy shooting mode - Manual
Digital zoom - None
Contrast - Normal
Saturation - Normal
Sharpness - Normal
ISO Value - 100
Metering mode - Evaluative
Focus type - Auto
AF point selected - Manual AF point selection
Exposure mode - Manual
Focal length - 5800 - 23200 mm (1000 mm)
Flash activity -
Flash details -
Focus mode 2 - Single
Auto ISO - 100
Base ISO - 100
White Balance - Sunny
Sequence number - 0
Flash bias - 0 EV
Subject Distance - 0.00
Image Type - IMG:PowerShot A590 IS JPEG
Firmware Version - Firmware Version 1.01
Image Number - 1000601
Owner Name -
Sharpness (EOS 1D) - 0
Directory index (EOS 450D) - 0

Thumbnail: -
Compression - 6 (JPG)
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
JpegIFOffset - 5108
JpegIFByteCount - 4025

http://foto3d.w8w.pl/prbl/IMG_0708R.JPG

Code: [Select]
Filename - IMG_0708R.JPG
Make - Canon
Model - Canon PowerShot A590 IS
Orientation - Right top
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
DateTime - 2011:01:22 13:47:33
YCbCrPositioning - Centered
ExifOffset - 196
ExposureTime - 1/200 seconds
FNumber - 5.00
ISOSpeedRatings - 100
ExifVersion - 0220
DateTimeOriginal - 2011:01:22 13:47:33
DateTimeDigitized - 2011:01:22 13:47:33
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 5 (bits/pixel)
ShutterSpeedValue - 1/202 seconds
ApertureValue - F 5.02
ExposureBiasValue - 0.00
MaxApertureValue - F 2.59
MeteringMode - Multi-segment
Flash - Flash not fired, compulsory flash mode
FocalLength - 5.80 mm
UserComment -
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 3264
ExifImageHeight - 2448
InteroperabilityOffset - 3178
FocalPlaneXResolution - 14506.67
FocalPlaneYResolution - 14485.21
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Manual
White Balance - Manual
DigitalZoomRatio - 1.00 x
SceneCaptureType - Standard

Maker Note (Vendor): -
Macro mode - Normal
Self timer - Off
Quality - Superfine
Flash mode - Not fired
Sequence mode - Single or Timer
Focus mode - Single
Image size - Large
Easy shooting mode - Manual
Digital zoom - None
Contrast - Normal
Saturation - Normal
Sharpness - Normal
ISO Value - 100
Metering mode - Evaluative
Focus type - Auto
AF point selected - Manual AF point selection
Exposure mode - Manual
Focal length - 5800 - 23200 mm (1000 mm)
Flash activity -
Flash details -
Focus mode 2 - Single
Auto ISO - 100
Base ISO - 100
White Balance - Sunny
Sequence number - 0
Flash bias - 0 EV
Subject Distance - 0.00
Image Type - IMG:PowerShot A590 IS JPEG
Firmware Version - Firmware Version 1.01
Image Number - 1000708
Owner Name -
Sharpness (EOS 1D) - 0
Directory index (EOS 450D) - 0

Thumbnail: -
Compression - 6 (JPG)
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
JpegIFOffset - 5108
JpegIFByteCount - 3892


Everything ( but clock :) ) is set the same, and the photos are not the same. For me it looks, that WB is not the same, but it is as EXIF says :) So probably it is sensor issue, not fixable at home. But I have CHDK and I could probably use curves correction - but how? How to discover proper curve shape? Is there any tool which could calculate it? Or only set&try method?

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Offline zeno

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Re: Two (not) identical A590IS
« Reply #1 on: 25 / January / 2011, 06:22:09 »
The images are not accessible to me (I just get shown this page http://hotlink.friko.pl/3.jpg), but I see that the camera orientation is not the same - one camera is upside down (because you are using an SDM rig?). What happens if both cameras have the same orientation?
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Offline morel

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Re: Two (not) identical A590IS
« Reply #2 on: 25 / January / 2011, 08:45:54 »
Here are images:
Code: [Select]
http://foto3d.w8w.pl/prbl/IMG_0601L.JPG
http://foto3d.w8w.pl/prbl/IMG_0708R.JPG
Yes - the cameras orientation is different, because I use SDM rig. And I must confess that I haven't tried to do some photos without it, so I don't know if it is the cause :)
But even if so, it is not a solution for me, because mounting them in the same orientation, makes the distance between lenses bigger, what is not good for stereophotography - A590 body is not symmetrical :/
So maybe there is still hope in CHDK curves? :) Or some other feature?
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Offline Microfunguy

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    • StereoData Maker
Re: Two (not) identical A590IS
« Reply #3 on: 25 / January / 2011, 10:17:36 »
First of all, that is a difficult subject to capture on a point-and-shoot camera.

You have white snow and a very dark statue, it is almost black-and -white.

They look OK to me.

If you wish, load them into StereoPhoto maker (SPM) and select Adjust\Auto Color Adjust.
Choose left or right image as reference, SPM will try to adjust the other image to match.
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Offline fudgey

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Re: Two (not) identical A590IS
« Reply #4 on: 25 / January / 2011, 13:15:14 »
I can't see the photos either, but if the reason is different WB, you may get improved result using custom WB mode instead of the "Sunny" preset. The camera fine tunes white balance in all preset modes, but not in custom mode.

Also, you may be able to find Canon's WB coefficients from JPEG EXIF:
http://chdk.setepontos.com/index.php?topic=156.msg27340#msg27340
http://chdk.setepontos.com/index.php?topic=156.msg27569#msg27569
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Offline Microfunguy

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Re: Two (not) identical A590IS
« Reply #5 on: 25 / January / 2011, 14:38:24 »
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Offline fudgey

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Re: Two (not) identical A590IS
« Reply #6 on: 25 / January / 2011, 16:44:48 »
Quote from: Microfunguy on 25 / January / 2011, 14:38:24
http://foto3d.w8w.pl/prbl/IMG_0601L.JPG
http://foto3d.w8w.pl/prbl/IMG_0708R.JPG
No go, I get the same hotlink images zeno does, possibly because I refuse scripts for safety.
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Offline zeno

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Re: Two (not) identical A590IS
« Reply #7 on: 26 / January / 2011, 05:32:32 »
@fudgey
can't see them in Firefox, but I just tried Safari and it shows them. As you say, security checking must have been preventing it in Firefox.
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Author of ASSIST, STICK, WASP, ACID, SDMInst, LICKS, WICKS, MacBoot, UBDB, CFGEdit
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