# HG changeset patch
# User Michał Pecio <>
# Date 1527414310 -3600
# Node ID 031705583cafb72094d650f597f578d168854465
# Parent  8c1423d43ec260efa513881109f751c7b4acf9f1
Support for Canon ISO tags

Some pre-2010 Canon cameras didn't write the standard EXIF ISO speed
tag. The ISO speed of photos taken with such cameras can be found in
the proprietary Exif.CanonSi.ISOSpeed tag

diff -r 8c1423d43ec2 -r 031705583caf src/exif-common.c
--- a/src/exif-common.c	Sat May 26 20:20:01 2018 +0100
+++ b/src/exif-common.c	Sun May 27 10:45:10 2018 +0100
@@ -384,6 +384,8 @@
 	gchar *text;
 
 	text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
+	/* old canon may set this instead */
+	if (!text) text = exif_get_data_as_text(exif, "Exif.CanonSi.ISOSpeed");
 	/* kodak may set this instead */
 	if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
 	return text;