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Old Aug 14, 2007, 3:55 AM   #1
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hi have just purchased the canon g7

When i put the photos onto the computer and look at properties summary and advanced etc it does not show what iso speed the photo was taken with .

i have the canon 3is and that does .

does anyone know how i can retrieve the data once i have the photo on the computer



only having thatproblem with the canon g7

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Old Aug 14, 2007, 8:06 AM   #2
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Canon keeps the ISO speed in one of the proprietary Makernote tags versus the Standard EXIF tags with some of their models.

So, not all software can decode it.

Irfanview can read it (after you open an image, you'll find it under Image>Information>EXIF)

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Old Aug 14, 2007, 12:52 PM   #3
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JimC wrote:
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Canon keeps the ISO speed in one of the proprietary Makernote tags versus the Standard EXIF tags with some of their models.

So, not all software can decode it.

Irfanview can read it (after you open an image, you'll find it under Image>Information>EXIF)
hi i have downloaded it but it says i need the plugin and i have not got a clue which one as i am new to this lol

is there a link to the actual plug in for the exif dll
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Old Aug 14, 2007, 12:58 PM   #4
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Just download the .exe file containing all of them for Irfanview. If you click on the plugins menu choice from the main page at http://www.irfanview.com , you'll see some download links.

Here is one link to them:

http://www.tucows.com/preview/415586


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Old Aug 14, 2007, 1:15 PM   #5
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JimC wrote:
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Just download the .exe file containing all of them for Irfanview. If you click on the plugins menu choice from the main page at http://www.irfanview.com , you'll see some download links.

Here is one link to them:

http://www.tucows.com/preview/415586

sorry i know im a pain have doenloaded the link you gave me but they are not showing the data i have win rar i have extracted them to the plugins folder but still nothing what am i doing wrong



it is working ok for mycanon s3is but not the canon g7 :?
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Old Aug 14, 2007, 2:02 PM   #6
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I use the .exe version of the plugins. It automatically installs them in the correct folder for Irfanview plugins (you don't need any kind of software to extract them).

The ISO speed should show for the G7. I tried it with one of the samples in our G7 Review and it showed up as ISO 80 in Irfanview.

Are you sure it's not there?

I tried IExif from Opanda first, and it didn't see the ISO speed in the EXIF. But, when I opened a sample image in Irfanview and checked, it saw it.

I'm in Linux right this minute. But, I'll reboot and check it again to make sure I didn't make a mistake and pick the wrong image or something.

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Old Aug 14, 2007, 2:10 PM   #7
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It works with our Sample Images. Use the .exe version of the plugins and it should install them automatically in the correct folder.

The ISO speed should be in the Maker Note section (shown as ISO Value in Irfanview). Here's the EXIF from one of our sample images using Irfanview to read it.

Make - Canon
Model - Canon PowerShot G7
Orientation - Top left
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
DateTime - 2006:11:06 01:15:57
YCbCrPositioning - Centered
ExifOffset - 196
ExposureTime - 1/800 seconds
FNumber - 4.00
ExifVersion - 0220
DateTimeOriginal - 2006:11:06 01:15:57
DateTimeDigitized - 2006:11:06 01:15:57
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 5 (bits/pixel)
ShutterSpeedValue - 1/807 seconds
ApertureValue - F 4.00
ExposureBiasValue - 0.00
MaxApertureValue - F 2.80
MeteringMode - Multi-segment
Flash - Not fired, compulsory flash mode
FocalLength - 8.21 mm
UserComment -
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 3648
ExifImageHeight - 2736
InteroperabilityOffset - 3314
FocalPlaneXResolution - 12710.80
FocalPlaneYResolution - 12725.58
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
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 - 80
Metering mode - Evaluative
Focus type - Auto
AF point selected - Manual AF point selection
Exposure mode - Program
Focal length - 7400 - 44400 mm (1000 mm)
Flash activity - Not fired
Flash details -
Focus mode 2 - Continuous
White Balance - Auto
Sequence number - 0
Flash bias - 0.00 EV
Subject Distance - 6553
Image Type - IMG PowerShot G7 JPEG
Firmware Version - Firmware Version 1.00
Image Number - 1010034
Owner Name -

Thumbnail: -
Compression - 6 (JPG)
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
JpegIFOffset - 5108
JpegIFByteCount - 4202


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Old Aug 14, 2007, 5:21 PM   #8
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hi thankyou i have done it thankyou for your help although not all photos from the g7 show the exif data :?but some do any ideas why that is ??????
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Old Aug 14, 2007, 5:34 PM   #9
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Some image editors will strip out the EXIF data. Some strip out pieces of it, too (even when they leave most of it in). So, be careful what you edit with.

With something like Photoshop, Save for Web strips it out (since it does take up a very small amount of space to leave it in). But, Save As can keep it.

Irfanview gives you the option of saving it or not if you use the Save As feature after editing (there will be a check box for it, and it should be checked by default).

But, I'd make sure to save my originals, no matter what (never overwrite them). It's hard to undo changes if you overwrite the original. ;-)

So, I'd give images new names and/or save edited versions in a separate folder after any editing, making sure to use Save As versus Save with an editor.

BTW, Irfanview makes a great tool for resizing images (under Image>Resize Resample). It can also resize in batch mode (so you can resize a group of photos at one time). It can do renaming while saving, and you'll see options for many more things you can do in batch operations (look under the Advanced Tab you'll see if you use the Batch Operations features).

Irfanview's redeye correction is pretty good for correcting "demon eye" that some editors don't seem to do well with, too. Instead of using the Redeye Correction from the normal menu choice for it, use the one under Image>Effects>Effects Browser. After you select an eye with your mouse (and I'd zoom in and draw the smallest box possible around the area with red in it), you can apply different levels of correction until it gives you what you need (and it's got a preview feature so you can see how much to apply).


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Old Aug 15, 2007, 3:45 AM   #10
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thankyou you have been very kind in helping me
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