ExifTool Forum
ExifTool => Newbies => Topic started by: Jeroen on April 19, 2019, 03:22:02 PM
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Hi,
Completely new to this forum! Trying to find my way in batch files and Exiftool.
I have a Fujifilm X_Pro2 camera, with a few Fujinon lenses but also some vintage lensen, and they have obviously no exif data written in the files.
Only I can decide to set (in the camera setiings) the focal length of the lens.
Now I want to try to automate the lens data before importing in the raw developer software (Capture One), so I want to write a batch file that does the following:
Read all files in directory, and check Lensmake (something like exiftools -Lensmake *)
If Lensmake = FUJIFILM do nothing but process next file
If FocalLenght = 28 then Lensmake = Takumar, Model = etc and proecess next file
If FocalLength = 50 them Lensmake = etc etc and process next file
I know the exiftool -Lensmake parameter, but I do not know how to base the logic of this batch file upon this.
Any help greatly appreciated!
thanks
Jeroen
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The thing about exiftool is that it can do most of the batch type commands by itself without having to write a complicated script.
Your example can be run with two commands
exiftool -if "$EXIF:FocalLength#==28" -LensMake=Takumar -LensModel=Model FileOrDir
exiftool -if "$EXIF:FocalLength#==50" -LensMake="Something Else" -LensModel="Some other Model" FileOrDir
These commands check the raw value (the trailing #, see -n (printConv) option (https://exiftool.org/exiftool_pod.html#n---printConv)) of the EXIF:FocalLength to see if it's 28 or 50 and ignore anything else. You then set any tag you need to set (see the EXIF tag names page (https://exiftool.org/TagNames/EXIF.html)).
I used the raw values here because it might be easier to deal with. Without the trailing hashtag, the results would be something like 28.0 mm. There are a couple other ways to do the compare (using eq or the =~ binding operator) as well. Replace FileOrDir with the files and/or directories to be processed.
This command creates backup files. Add -overwrite_original to suppress the creation of backup files. Add -r to recurse into subdirectories. If this command is run under Unix/Mac, reverse any double/single quotes to avoid bash interpretation.
One thing to avoid with exiftool is to use it in a looping script (see Common Mistake #3 (https://exiftool.org/mistakes.html#M3)). Exiftool's biggest performance hit is the startup time and if you have to run it individually on hundreds or thousands of files, it can take an extremely long time.
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You would need a double == for the comparison:
exiftool -if "$EXIF:FocalLength#==28" -LensMake=Takumar -LensModel=Model FileOrDir
exiftool -if "$EXIF:FocalLength#==50" -LensMake="Something Else" -LensModel="Some other Model" FileOrDir
But be careful that FocalLength# is exactly 50, and not 49.9 or something.
- Phil
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D'oh!
Fixed.
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Many thanks StarGeek and Phil :) :)
It is certain that it might have taken me a good deal of time to find that out!
Was on a completely wrong track, with command file logic, this looks MUCH better so, wil try to incorporate this, learned something again.
The logic I am looking for is a bit different ;), because when it is a Fujifilm lens, then all necessary Exifdata is there, and I do not want to do anything. Only when it is NOT a Fujifilm make, then these commands have to run. In theory it might happen that there is a Fujifilm lens with a focallength of 28 or 50, but then NO processing is to be done. I think I might be able to figure out now a way to accomplish that. Something along the line of:
exiftool -if "$EXIF:LensMake#==FUJIFILM" do nothing,
else
exiftool -if "$EXIF:FocalLength#==28" -LensMake=Takumar -LensModel=Model FileOrDir
Yes I know that it will not work with 49.9, but that is the one Exifdata I have to set deliberately on the camera when not using a compleely manual lens, meant to set the viewfinder correct, but I use it for this purpose.
Jeroen
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This can be done quite easily. You just need to use the proper comparison operators; ==, != etc. are for numerical values, eq, ne etc. are for strings.
So in your case case the command would be something like this:
exiftool -if "$EXIF:FocalLength#==28 && $EXIF:LensMake ne 'FUJIFILM'" -LensMake=Takumar -LensModel=Model FileOrDir
In this case you don't need the hash after the LensMake tag name since its a string already. The && stands for and (which you could have used as well ;)).
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Again, incredibly fast and helpful reply, many thanks :)
Exiftool is much more powerful than I thought!
As soon as I have time I will try to fiddle with all this, very helpful!
Jeroen
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Hi Jeroen,
Graag gedaan :)
If you know a little perl, you'll be able to perform even more sophisticated manipulations than the rather straightforward example you now presented ;D
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Yes, I now see that is has some true scripting capabilities, not a command-only exe.
But for now I am more than satisfied with what I tried to accomplish, script is already almost ready, thanks to this jumpstart :)
In this case I do not really need much more sophistication, because the camera adds the Exifdata for the picture taken, the only data I miss are the lens data, which I can provide this way. After this the only data that still lacks are the f-stops used per picture, but in order to know these, I have to remember them or write them down, old fashioned ;D
Jeroen