User Manual

Field Ordering in Graphic Imports and Exports
1465
Field Ordering in Graphic Imports and Exports
Graphic images consist of one or more image files, each of which contains a full frame. These
frames contain fields (formed from the odd-numbered and even-numbered lines of the image
frame) that have three basic arrangements:
• Progressive or still frame: The upper and lower fields in the frame originated at the same
instant of time, or are coherent with each other, as shown in the following illustration.
Dashed lines = Field 1 (.1), Solid lines = Field 2 (.2), and the arrow represents time.
• Upper field is first: The upper field in the frame (odd-numbered lines, when the frame lines
are numbered starting from 1) occurs temporally before the lower field, as shown in the
following illustration. This arrangement is termed “upper field first” (or “lower field
second”).
• Lower field is first: The lower field in the frame (even-numbered lines) occurs temporally
first, as shown in the following illustration. This arrangement is termed “lower field first” (or
“upper field second”).
.1
.2
.1 and .2
.1
.2
.1 .2
.1
.2
.2.1