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==== IFD format & Tag ====
==== IFD format & Tag ====


[[Template:IFD_format|IFD format]] & [[Template:IFD_tag|IFD tag]]
[[Template:IFD_format|IFD format]]
 
 
=== IFD Tag: ===
 
*orientation (of the image with respect to the rows and columns)
 
Tag = 274 (112.H)
 
Type = SHORT
 
N= 1
 
<small>
<pre>
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
8 = The 0th row represents the visual left-hand side of the image, and the 0th column
represents the visual bottom.
Default is 1.
Support for orientations other than 1 is not a Baseline TIFF requirement.
</pre>
</small>
 
*XResolution (The number of pixels per ResolutionUnit in the ImageWidth direction)
 
Tag = 282 (11A.H)
 
Type = RATIONAL
 
N= 1
 
<small>
<pre>
It is not mandatory that the image be actually displayed or printed at the size implied
by this parameter. It is up to the application to use this information as it wishes.
No default. See also YResolution, ResolutionUnit
</pre>
</small>
 
 
*ResolutionUnit (The unit of measurement for XResolution and YResolution)
 
Tag = 296 (128.H)
 
Type = SHORT
 
N= 1
 
<small>
<pre>
To be used with XResolution and YResolution.
1 = No absolute unit of measurement. Used for images that may have a non-square
aspect ratio, but no meaningful absolute dimensions.
The drawback of ResolutionUnit=1 is that different applications will import the image
at different sizes. Even if the decision is arbitrary, it might be better to use dots per
inch or dots per centimeter, and to pick XResolution and YResolution so that the
aspect ratio is correct and the maximum dimension of the image is about four inches
(the “four” is arbitrary.)
2 = Inch.
3 = Centimeter.
Default is 2.
</pre>
</small>
 
 
*DateTime (Date and time of image creation)
 
Tag = 306 (132.H)
 
Type = ASCII
 
N= 20
 
<small>
<pre>
The format is: “YYYY:MM:DD HH:MM:SS”, with hours like those on a 24-hour
clock, and one space character between the date and the time. The length of the
string, including the terminating NUL, is 20 bytes.
</pre>
</small>
 
 
*YCbCr Positioning (Specifies the positioning of subsampled chrominance components relative to
luminance samples)
 
Tag = 531 (213.H)
 
Type = SHORT
 
N= 1
 
<small>
<pre>
The values for this field are defined as follows:
 
1: centered
 
2: cosited
</pre>
</small>


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