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photoimage-resizingexifexiftool

Resize image preserving exif data: focal length etc

What converter(like imagemagick) can be used to convert images with exif data preserving it?

What if I downscale images 4 times? Should I also change the focal length?

Data I have extracted from my JPG photo with exiftool

Focal Length                    : 50.0 mm (35 mm equivalent: 50.0 mm)

EDIT: Seems imagemagick preserve exif data:

mogrify -resize 25% -path output_foler/ *.JPG

Solution

  • I believe newer versions of Imagemagick should preserve the metadata. A fall back would be to use Exiftool to copy the data with a command like exiftool -tagsfromfile OldFile -all:all NewFile.

    Both of those are platform independent. To be more precise with other programs, you will need specify your OS. For example, with Windows, you can use Irfanview to convert images and it will retain most metadata as long as you enable those options.