Bug: Flash tag decoded as 'None' instead of 'Off, Did not fire' #37

Problem

Flash EXIF tag is decoded as None when it should be Off, Did not fire (or similar descriptive text).

Comparison

File

testdata/jpeg/4k_landscape_sunset.jpg

Root Cause

The Flash tag (0x9209) is a bitmask with multiple fields:

• Bit 0: Flash fired (0 = No, 1 = Yes)
• Bits 1-2: Return light (0-3)
• Bits 3-4: Mode (0 = Unknown, 1 = On, 2 = Off, 3 = Auto)
• Bit 5: Function present (0 = Yes, 1 = No)
• Bit 6: Red-eye mode (0 = No, 1 = Yes)

For value 0x10 (16): Bits 3-4 = 10 (binary) = 2 = Off mode
Should decode to "Off, Did not fire"

Fix

Update Flash enum decoder to properly interpret the bitmask and generate descriptive string.

Priority

Low - Minor display difference