CHYRON Corporation
Total Motion Control 23-20 Revision D
These limits are not enforced by the software, as a CMF
animation of very short duration may not miss frames at
larger than recommended sizes. Additionally, in a CMF
with very little motion, a missed frame may not be
noticeable. The missed frame may also be located in a
portion of the video which is cut from the recorded CMF.
Any rectangle may be used as long as the number of pix-
els does not exceed the recommended limits, and the fol-
lowing conditions are met:
• The pixel width of the image must be a multiple of
16.
• The scanline height
x pixel width x 4 bytes per pixel
must be a multiple of 1024.
Any rectangle that meets the above tests is legal. For
example, a
720 x 80 rectangle is legal; as is a 128 x
464
rectangle. When the Crop Box is set, the soft-
ware automatically finds the nearest legal rectangle
to the one set by the operator. This procedure is
described in §23.4.6.
If using a square (1:1.1) aspect ratio, Table 23-3 provides
some examples of legal CMF animation size. The col-
umn headings are as follows:
•
Width: Legal width of a CMF.
•
Legal Height: Closest legal height that can be used
with that width to produce a 1:1.1 height:width
aspect ratio.
•
Height Needed to Display Square Image: What
the height would actually be if there were no CMF
requirements, and if pixels could be split. For exam-
ple, on the first line of the table, if the CMF is
144
pixels wide, it would have to be
130.9 pixels high to
display as a perfect square (
130.9:144 = 1:1.1). Due
to CMF requirements, the closest legal height is
128,
a difference in
2.9 pixels. This value is shown in the
last column.
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