TIFF 6.0 Specification
Final—June 3, 1992
NewSubfileType
A general indication of the kind of data contained in this subfile.
Tag = 254 (FE.H)
Type = LONG
N=1
Replaces the old SubfileType field, due to limitations in the definition of that field.
NewSubfileType is mainly useful when there are multiple subfiles in a single
TIFF file.
This field is made up of a set of 32 flag bits. Unused bits are expected to be 0. Bit 0
is the low-order bit.
Currently defined values are:
Bit 0 is 1 if the image is a reduced-resolution version of another image in this TIFF file;
else the bit is 0.
Bit 1 is 1 if the image is a single page of a multi-page image (see the PageNumber field
description); else the bit is 0.
Bit 2 is 1 if the image defines a transparency mask for another image in this TIFF file.
The PhotometricInterpretation value must be 4, designating a transparency mask.
These values are defined as bit flags because they are independent of each other.
Default is 0.
Orientation
The orientation of the image with respect to the rows and columns.
Tag
= 274 (112.H)
Type = SHORT
N
=1
1 = The 0th row represents the visual top of the image, and the 0th column represents
the visual left-hand side.
2 = The 0th row represents the visual top of the image, and the 0th column represents
the visual right-hand side.
3 = The 0th row represents the visual bottom of the image, and the 0th column repre-
sents the visual right-hand side.
4 = The 0th row represents the visual bottom of the image, and the 0th column repre-
sents the visual left-hand side.
5 = The 0th row represents the visual left-hand side of the image, and the 0th column
represents the visual top.
6 = The 0th row represents the visual right-hand side of the image, and the 0th column
represents the visual top.
7 = The 0th row represents the visual right-hand side of the image, and the 0th column
represents the visual bottom.
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