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14.5.3 Maximum Image size – how large can my Logo / Still Image / Testcard
be?
The image size for a Logo or Still Image / Testcard is limited by the amount of
memory available in the unit; this is approximately 128kbytes of compressed image
for a Still Image / Testcard and approximately 32kbytes for a Logo. The
compression used by the Image loader is Run Length Compression.
This provides excellent compression for simple images with well defined contiguous
blocks of colour such as logos. However the effectiveness of the compression is
reduced when images are anti-aliased, for example:
If we take a single line of pixels and look at them closely we will see
for a non aliased image solid pixels of one colour .If we look at a line
when anti-aliased we can see that no longer is the leg made of solid
pixels but of varying shades this will cause an increase in complexity
and reduction in compression.
So how large can the source logo / image be? The size of the original image is a
minor factor; the most important factor is the complexity and amount of anti-aliasing
that is present.
14.6
Resolution Editor
On some units it is possible to modify the resolutions that can be output and input;
where this is available a Resolutions tab will be shown on the main screen. This tab
will show the resolution database editor, and creation tool.
Figure 25 Resolution editor
