Incorrect calculation of ShutterSpeedValue?

Started by HenryvN, April 20, 2018, 10:08:22 AM

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HenryvN

April 20, 2018, 10:08:22 AM
I have the feeling that the ShutterSpeedValue (0x9201) is reporting the value of the ExposureTime (0x829A)
Regards, Henry

Phil Harvey

#1
April 20, 2018, 10:29:33 AM
Hi Henry,

ExifTool converts both ShutterSpeedValue and ApertureValue to the same units as ExposureTime and FNumber respectively to facilitate easy copying between these tags.  See the EXIF tags documentation for details.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux/PowerShell, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).

HenryvN

#2
April 25, 2018, 03:08:50 AM
Hi Phil,

I have attached two text files that were reported on the same JPG file. The only difference is that in the second file the verbose option is on. The syntax:
1: -- %EXIFTool% -a -u -g1 %filename% > c:\temp\exiftooloutput.txt
2: -- %EXIFTool% -a -u -g1 -v %filename% > c:\temp\exiftoolverboseoutput.txt
If you look in the first file, a value of 1/40 is reported for both Exposure Time and for Shutter Speed Value
In the second file, a value of 1/40 is reported for Exposure Time, but 5.322274882 (1123/211) for Shutter Speed Value. This is the correct value.

Best regards,
Henry


Phil Harvey

#3
April 25, 2018, 08:14:46 AM
Like I said, the value of 1123/211 is converted by ExifTool to seconds for your convenience.

- Phil
...where DIR is the name of a directory/folder containing the images.  On Mac/Linux/PowerShell, use single quotes (') instead of double quotes (") around arguments containing a dollar sign ($).
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