From 22395fca2529e2ff82f16d906e42bf4dab5a08f1 Mon Sep 17 00:00:00 2001
From: KAMADA Ken'ichi <kamada@nanohz.org>
Date: Thu, 13 Feb 2020 21:06:27 +0900
Subject: [PATCH] Handle "unknown" value in BrightnessValue.

---
 src/tag.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/tag.rs b/src/tag.rs
index 5a7cb6b..da56acb 100644
--- a/src/tag.rs
+++ b/src/tag.rs
@@ -419,7 +419,7 @@ generate_well_known_tag_constants!(
     (ApertureValue, 0x9202, DefaultValue::None, d_decimal,
      unit!["EV"],
      "Aperture"),
-    (BrightnessValue, 0x9203, DefaultValue::None, d_decimal,
+    (BrightnessValue, 0x9203, DefaultValue::None, d_optdecimal,
      unit!["EV"],
      "Brightness"),
     (ExposureBiasValue, 0x9204, DefaultValue::None, d_decimal,
@@ -1006,6 +1006,7 @@ fn d_subjarea(w: &mut dyn fmt::Write, value: &Value) -> fmt::Result {
 }
 
 // Rational/SRational with 0xffffffff being unknown.
+// BrightnessValue (Exif 0x9203),
 // Temperature (Exif 0x9400), Humidity (Exif 0x9401),
 // Pressure (Exif 0x9402), WaterDepth (Exif 0x9403),
 // Acceleration (Exif 0x9404), CameraElevationAngle (Exif 0x9405)