Export variable in Darktable for the aspect ratio or its x/y components?

[eldoradobirds]

Am using variables for file naming when exporting processed images. For instance, when saving jpeg of birds the storage option is file on disk with this:

$(FILE_FOLDER)/../CAGO_3x2_$(MAX_WIDTH)x$(MAX_HEIGHT)

This saves the file up one level and gets the exported pixel width and height. I am manually entering the four letter code for the bird species (CAGO in this instance is Canada Goose). I save images with 3x2, 2x3, 16x9, and 9x16 aspect ratio for posting on social media. I was wondering if there are any variables for the aspect ratio to save me from re-typing when switching between these?

[clanmills]

@eldoradobirds This is a question for Darktable which uses libexiv2 to processes metadata. The tags which deal with aspect ratio are:

1091 rmills@rmillsm4:~ $ exiv2 -g Dimension/i https://clanmills.com/Stonehenge.jpg
Exif.Photo.PixelXDimension                   Short       1  6000
Exif.Photo.PixelYDimension                   Short       1  4000
1092 rmills@rmillsm4:~ $ 

I don't use Darktable, so I'm not familiar with its variables or export/resampling capability. If I were doing this, I would write a bash or python script and use macOS sips to resize the image.

I've enjoyed many conversations with the Darktable folks (managers, developers and users) on the Pixls forum. If you ask there, I'm confident you'll get useful suggestions: https://discuss.pixls.us/