ISO (This isn’t a tag written by Canon, this is a made up tag)Ĭanon DPP 4 reads the ISO value from the following metadata field: Recommended Exposure Index : 2500Īffinity Photo is reading the ISO value from the following metadata field: When the file is then saved, Affinity Photo overwrites the EXIF metadata field with this calculated value-which it shouldn’t be doing, as that field already contains the correct value for that tag.īelow is the ISO metadata from different camera raw files as displayed by ExifTool and the metadata values being used by Affinity Photo. Instead of reading the ISO value from the EXIF metadata field, Affinity Photo is ignoring that EXIF field and instead using a calculated ISO value from a different field. While this only affects Canon files, the issue lies in how Affinity Photo is reading the metadata from the file. Our in-house photographer always sets the ISO manually and is seeing the same thing as you with his Canon files but not for the other files mentioned above. We also thought it may be a result of using automatic ISO but this doesn't appear to be the case.

This may be a 'Canon thing' as we've checked with RW2, ARW and ORF files which don't seem to be doing the same thing. In the below image file, when the image is exported from Affinity Photo, Affinity Photo changes the EXIF ISO value from ISO 5000 to ISO 4935. In the below image file, when the image is exported from Affinity Photo, Affinity Photo changes the EXIF ISO value from ISO 4000 to ISO 4150. In the below image file, when the image is exported from Affinity Photo, Affinity Photo changes the EXIF ISO value from ISO 2500 to ISO 2468. In the below image file, when the image is exported from Affinity Photo, Affinity Photo changes the EXIF ISO value from ISO 2000 to ISO 2075. In the below image file, when the image is exported from Affinity Photo, Affinity Photo changes the EXIF ISO value from ISO 1000 to ISO 1037.

TIF file exported from Canon DPP 4 and then opened in Affinity Photo. CR2 raw file opened directly in Affinity Photo and also with a. The camera is using Auto ISO, therefore the camera automatically determines ISO. 800, 1600, 3200, 6400), the ISO value in the EXIF metadata is altered slightly when it’s exported, meaning it differs to what Canon set the metadata as. When editing image files from a Canon camera in Affinity Photo, if the ISO value isn’t in whole stops (I.E.

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