JEITA CP-3451
- 33 -
When this tag records an OECF of m rows and n columns, the values are as in Figure 10.
Length
Type
Meaning
2
SHORT
Columns = n
2
SHORT
Rows = m
Any
ASCII
0th column item name (NULL terminated)
:
:
:
Any
ASCII
n-1th column item name (NULL terminated)
8
SRATIONAL
OECF value [0,0]
:
:
:
8
SRATIONAL
OECF value [n-1,0]
8
SRATIONAL
OECF value [0,m-1]
:
:
:
8
SRATIONAL
OECF value [n-1,m-1]
Figure 10 OECF Description
Table 9 gives a simple example.
Table 9 Example of Exposure and RGB Output Level
Camera log Aperture
R Output Level
G Output Level
B Output Level
-3.0
10.2
12.4
8.9
-2.0
48.1
47.5
48.3
-1.0
150.2
152.0
149.8
ShutterSpeedValue
Shutter speed. The unit is the APEX (Additive System of Photographic Exposure) setting (see Annex C).
Tag
=
37377 (9201.H)
Type
=
SRATIONAL
Count
=
1
Default
=
none
ApertureValue
The lens aperture. The unit is the APEX value.
Tag
=
37378 (9202.H)
Type
=
RATIONAL
Count
=
1
Default
=
none
BrightnessValue
The value of brightness. The unit is the APEX value. Ordinarily it is given in the range of -99.99 to 99.99. Note that
if the numerator of the recorded value is FFFFFFFF.H, Unknown shall be indicated.
Tag
=
37379 (9203.H)
Type
=
SRATIONAL
Count
=
1
Default
=
none