Comment by simonw

I built a tool for that back in March: https://simonwillison.net/2024/Mar/26/llm-cmd/

    llm cmd use imagemagick to convert goats.jpg into four different JPEG qualities

I ran that just now and it suggested:

    convert goats.jpg -quality 10 goats_quality_10.jpg && \
      convert goats.jpg -quality 30 goats_quality_30.jpg && \
      convert goats.jpg -quality 50 goats_quality_50.jpg && \
      convert goats.jpg -quality 90 goats_quality_90.jpg

Which, sure enough, produced me a bunch of different quality images!