JEITA CP-3451
- 17 -
A. Tags relating to image data structure
ImageWidth
The number of columns of image data, equal to the number of pixels per row. In JPEG compressed data a JPEG
marker is used instead of this tag.
Tag
=
256 (100.H)
Type
=
SHORT or LONG
Count
=
1
Default
=
none
ImageLength
The number of rows of image data. In JPEG compressed data a JPEG marker is used instead of this tag.
Tag
=
257 (101.H)
Type
=
SHORT or LONG
Count
=
1
Default
=
none
BitsPerSample
The number of bits per image component. In this standard each component of the image is 8 bits, so the value for
this tag is 8. See also SamplesPerPixel. In JPEG compressed data a JPEG marker is used instead of this tag.
Tag
=
258 (102.H)
Type
=
SHORT
Count
=
3
Default
=
8 8 8
Compression
The compression scheme used for the image data. When a primary image is JPEG compressed, this designation is
not necessary and is omitted. When thumbnails use JPEG compression, this tag value is set to 6.
Tag
=
259 (103.H)
Type
=
SHORT
Count
=
1
Default
=
none
1
=
uncompressed
6
=
JPEG compression (thumbnails only)
Other
=
reserved
PhotometricInterpretation
The pixel composition. In JPEG compressed data a JPEG marker is used instead of this tag.
Tag
=
262 (106.H)
Type
=
SHORT
Count
=
1
Default
=
none
2
=
RGB
6
=
YCbCr
Other
=
reserved