White and Black Balance
| These two stepped gray scales are 24 bit minimal compression
JPG images demonstrating the differences in color purity (or
accuracy of white & black balances). The UMAX 1220P was
adjusted for the best I could get after much tweaking, whereas
the Canon CanoScan FB620P require no tweaking. Both were captured
from the same brightness/darkness range setting & used a
gamma setting of 1.6. If you download these images (by right
mouse clicking on them & saving them to your drive) and
take them into a paint program where you can click on various
parts of the screen with the eye dropped to see the RGB values,
you'll see that the Canon scanner offers a lot better color
accuracy or purity of white & black balance. These files
are already sized to 720X486 pixels & are suitable for importing
into NLE systems for video. Interestingly the Canon stepped
gray scale when used in video looks fine but exhibits a fuzzy
IRE brightness level on the waveform monitor which is probably
the subtle posterization look I noticed. |
This image is from the UMAX 1220P scanner.
The image below is from the Canon CanoScan FB620P scanner.
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