I did some more research and figured out one way to do it.
- created a skin with a minimal 'current.html.tmpl' file with the string
I want overlaid on the image
- I already have a webcam taking a snapshot every few minutes ('motion'
running on a raspi with a usb cam)
- created a quick script to overlay the data on the image
Script contents:
#
https://stackoverflow.com/questions/40880237/how-to-add-bottom-box-and-text-to-a-picture-in-linux
MSG=`cat /mnt/ramdisk/current.html`
convert /mnt/ramdisk/motion/image.jpg -alpha on
\
\( +clone -scale x5% -threshold 101% -channel A -fx "0.5" \) \
-gravity north -composite \
-fill white -pointsize 18 -annotate 0,0 "${MSG}"
/mnt/ramdisk/motion/image-overlaid.jpg
Template file 'current.html.tmpl' contents:
current=$current.outTemp.raw F, max=$day.outTemp.max.raw F,
min=$day.outTemp.min.raw F
Example output:
[image: image-overlaid.jpg]
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