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Fun with image metadata
Posted by: deckeda
Date: April 21, 2021 07:38PM
So I'm playing with some scanned slides, well pictures taken actually with my DSLR on a setup I'll post about some day later. I'm using an adapted enlarger lens because hey, the "scene" (i.e. the slide) is entirely flat, something regular camera lenses -- including macro ones -- aren't really designed to capture.

So I'm using a chipped adapter which lies to the camera and always reports F stop as 1.4 and the lens as a generic, basic zoom model.

I put the image into Photos and Photos naturally reveals the wrong aperture and lens info, as read from the file, right? But ... I open the image in an editor and the lens identity isn't appearing in the usual IPTC or EXIF or XMP fields. And of course, Photos doesn't let you edit that stuff.

So what is Photos reading? For whatever reason it's gotta be reading from some camera-maker specific field. Exiftool to the rescue.


But it's a command line tool and I'm lazy. Scroll down and the author made some AppleScript droplets that let you view a file's metadata in various ways, which is what I'm after. There it is, LensType: Canon EF 35-80mm f/4-5.6

Don't ever intentionally spend money a Canon EF 35-80mm f/4-5.6 (or the similar 28-80 ... these were their first auto focus kit zooms and are both good as body caps only.)

Now all I gotta do is add the Canon:LensType field to my editor's available choices (MetaImage has a bunch available in Prefs) and voila, Photos is once again fooled.


Did I mention I'm still planning on moving away from Photos? For example, Lightroom can also edit "some" metadata directly, but which fields does it read and edit ...

And that my secondary viewer (SmugMug, online) reads still yet other metadata fields ...) This is the problem: lack of standardization.
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Re: Fun with image metadata
Posted by: btfc
Date: April 21, 2021 08:11PM
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Re: Fun with image metadata
Posted by: DP
Date: April 22, 2021 06:14AM
So you're just changing the metadata, or removing it, or what? And, why? Sorry I sound dumb here but I'm not sure what you're doing with it...

Back to music...

Disclaimer: This post is checked for correct spelling, punctuation, and grammar. Any attempts at humor are solely the responsibility of the author and bear no claim that any and all readers will approve or appreciate said attempt at humor.
My name is DP, and I approve this message.
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Re: Fun with image metadata
Posted by: Rolando
Date: April 25, 2021 10:42AM
Try ExifRenamer

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