Can darktable export multiple JPEG sizes from one RAW file in a single workflow?

Question

I want to export several resized JPEG versions of the same RAW image in darktable, for example 3840×2160, 1920×1080, and 960×540, with filenames that reflect the size. In lighttable, the export module lets me set one maximum width/height at a time, but I’d like to avoid entering each size manually for every image. Is there a built-in way to export multiple sizes at once, or is scripting/presets the practical solution?

workflow darktable export jpeg batch-processing

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

9y ago

user6508 · Answer

It's easy enough to do in a shell script using the commad-line interface:

#!/bin/sh
for FILE in file1 file2 file3
do
    for SIZE in 640 800 1280
    do
        darktable-cli "${FILE}.nef" "${FILE}.xmp" \
            "${FILE}-${SIZE}.jpg" \
            --width "${SIZE}" --height "${SIZE}" --hiq true
    done
done

This is pretty close to verbatim from one of the custom programs that's part of my workflow.

Can darktable export multiple JPEG sizes from one RAW file in a single workflow?

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