I need to get a string that consists of the information from the image's EXIF meta data. For example, I would like:
CameraModel, Focal Length in 35mm Format: 24mm, F11, 1/500, ISO 200
I could see all the information present from
identify -format '%[EXIF:*]' image.jpg
However, I'm having trouble consolidating the output and generate the information.
The first problem, while '%[EXIF:*]' prints all EXIF data, if I replace the star with a specific EXIF tag, it doesn't print out anything. I know I could simply print out all EXIF data a few times and use grep to get the one I need, then combine them together, but it feels better to retrieve just the value I'm looking for.
The second problem, the aperture value FNumber is in a format like "63/10", but I need it to be 6.3; Annoyingly, the shutter speed ExposureTime is like 10/5000 and I need it to be 1/500. What kind of conversion do I need for each case?
Thanks!
This works fine for me in Imagemagick 6.9.9.29 Q16 Mac OSX.
infile="P1050001.JPG"
cameramodel=`identify -ping -format "%[EXIF:model]" "$infile"`
focallenght35=`identify -ping -format "%[EXIF:FocalLengthIn35mmFilm]" "$infile"`
fnumber1=`identify -ping -format "%[EXIF:FNumber]" "$infile" | cut -d/ -f1`
fnumber2=`identify -ping -format "%[EXIF:FNumber]" "$infile" | cut -d/ -f2`
exptime1=`identify -ping -format "%[EXIF:ExposureTime]" "$infile" | cut -d/ -f1`
exptime2=`identify -ping -format "%[EXIF:ExposureTime]" "$infile" | cut -d/ -f2`
isospeed=`identify -ping -format "%[EXIF:ISOSpeedRatings]" "$infile"`
fnumber=`echo "scale=1; $fnumber1/$fnumber2" | bc`
exptime=`echo "scale=3; $exptime1/$exptime2" | bc`
echo "CameraModel=$cameramodel, FocalLengthIn35mmFilm: $focallenght35 mm, F$fnumber, $exptime sec, ISO $isospeed"
CameraModel=DMC-FZ30, FocalLengthIn35mmFilm: 35 mm, F2.8, .125 sec, ISO 200
Or alternately,
infile="P1050001.JPG"
declare `convert -ping "$infile" -format "cameramodel=%[EXIF:model]\n focallenght35=%[EXIF:FocalLengthIn35mmFilm]\n fnumber=%[EXIF:FNumber]\n exptime=%[EXIF:ExposureTime]\n isospeed=%[EXIF:ISOSpeedRatings]\n" info:`
fnumber1=`echo $fnumber | cut -d/ -f1`
fnumber2=`echo $fnumber | cut -d/ -f2`
fnumber=`echo "scale=1; $fnumber1/$fnumber2" | bc`
exptime1=`echo $exptime | cut -d/ -f1`
exptime2=`echo $exptime | cut -d/ -f2`
exptime=`echo "scale=0; $exptime2/$exptime1" | bc`
echo "CameraModel=$cameramodel, FocalLengthIn35mmFilm: $focallenght35 mm, F$fnumber, 1/$exptime sec, ISO $isospeed"
CameraModel=DMC-FZ30, FocalLengthIn35mmFilm: 35 mm, F2.8, 1/8 sec, ISO 200