Appendix D
Maximum Animation Sequence Length and Frame Size
The maximum length of an animation sequence is a function of the size of the
individual frames. Each frame of the animation is "integer tiled" across a buffer that is
720 pixels wide (one video line), and 846 lines tall. To be "integer tiled" means that
only an integer number of tiles are allowed horizontally or vertically, and any left
over (fractional) space will be wasted. So, for example, an 80x60 frame will fit
exactly 720/80 = 9 times across, and 846/60 = 14 times vertically. Therefore, you can
have a sequence as long as 126 frames (9*14). If your image is 81x62, however, only
8 will fit across, and 13 down, giving you a total of just 104 frames.
The DPS-475/575 allows any size of frame, as long as it fits into memory. Therefore,
you could have an image 720 pixels wide by 16 lines tall, and animate it over 52
frames. It's in your best interest to choose a frame size that is an integer fraction of
the line width (720), to reduce wasted buffer memory.
The following table gives examples of the maximum sequence length for various
frame sizes:
It is not possible to exactly calculate animation file sizes (i.e. the amount of memory
needed to store a particular sequence) in advance, because there is a loss-less
compression step, and the resulting size will vary depending on the content of the
animation file. Without the compression, each pixel would require 3 bytes. Therefore,
the 80x60 examples above would take, at most, 1.7M bytes (plus a bit of overhead).
207
To Next Page
Loading...
