Editing LiveArea:Photos
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==== IFD format & Tag ==== | ==== IFD format & Tag ==== | ||
[[Template:IFD_format|IFD format]] | [[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> | |||
== Gallery == | == Gallery == |