How can I losslessly extract a single 2D JPEG from a stereoscopic MPO/JPEG file on Linux?

Question

I have images exported from a Nintendo 3DS that are stored as stereoscopic JPEG/MPO-style files containing two JPEG images. For web use, I only need one view and want to reduce file size without recompressing the image. Is there a Linux-compatible way to extract just one embedded JPEG losslessly, while optionally preserving or later stripping metadata?

stereoscopic linux jpeg mpo lossless

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

Photography Stack Exchange contributor

8y ago

user75526 · Answer

Here is a bash script that extracts left-right stereo pairs from mpo files using exiftool. Depending on the source of the file, the right image may be stored within a different tag.

#!/usr/bin/env bash

for i in *.mpo ; do
    j="${i#*/}"
    k="${j%.mpo}"

    # extract left images
    exiftool -trailer:all= "$i" -o "${k}.left.jpg"
    exiftool -TagsFromFile "$i" "${k}.left.jpg"

    # extract right images
    if exiftool "$i" | grep "MP Image 3" ; then
        # Samsung NX 45mm f/1.8 2D/3D
        exiftool "$i" -mpimage3 -b > "${k}.right.jpg"
        exiftool -TagsFromFile "$i" "${k}.right.jpg"
    else
        # Fujifilm Real 3D W3
        exiftool "$i" -mpimage2 -b > "${k}.right.jpg"
        exiftool -TagsFromFile "$i" "${k}.right.jpg"
    fi
done

How can I losslessly extract a single 2D JPEG from a stereoscopic MPO/JPEG file on Linux?

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