JEITA CP-3451 Explication
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Explication Table 2 Examples of Processing to be Avoided by Readers
Processing that goes against the
intent of the recorded values
Duplicate processing
Contrast
Softening when hard contrast
was intended
Excessive softening when soft
contrast is recorded
Saturation Lowering saturation when high
saturation was intended
Raising saturation excessively
when high saturation is recorded
Sharpness Increasing
sharpness
when
weak sharpness was intended
Increasing sharpness excessively
when
strong
sharpness
is
recorded
7.3.14 SubjectDistanceRange
Tag Information
Indicates the distance range to the subject.
[Writer]
−This is the distance to the part of the scene determined by the writer to be the main subject. The means of
measuring this and the precision are implementation dependent. The camera setting may be recorded.
−When the subject distance range cannot be determined, 0 (unknown) shall be recorded.
−When macro mode is set, 1 (macro) shall be recorded.
−Generally if the subject distance is 1 to 3 meters, 2 (close view) shall be recorded.
−If the subject is farther than close range, 3 (distant view) shall be recorded.
[Reader]
−This information can be used as information for processing images shot with flash.
−It can also be used as additional information about the SceneCaptureType.
7.4 Application Software Guidelines
These guidelines give examples of tag handling when Exif image files are edited in application software. The
problem here is that when application software edits and saves an Exif file, in some cases the tag information is not
recorded the way it should be. By developing applications to handle tags in accordance with these guidelines,
program developers can ensure that Exif image files are treated suitably.
7.4.1 Tag handling by application software
Tags contain important information about the image data in a file. When application software processes an image
and saves it as a new Exif image file, it is important that this Exif tag information be recorded properly along with
the image. When a large amount of tag information is to be re-recorded, it can be copied from the original Exif file.
Some of the tags, however, should be updated to reflect the changes made by the application software.
7.4.2 Tag handling examples
This section explains tag handling when the following representative processing is performed.
a) Rotation