Visual Circuits Firefly User Manual page 70

2 & 4 channel
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3. If desired, adjust the key color. The key color property deals
with blocking out or cropping specified colors within the
graphic overlays. For example, if the image you are using is
your company logo (in color) and is placed on top of a white
rectangular background, you may only want to display the
company logo, instead of the logo on top of the white
background.
Within the key color property, there are three options: None,
Auto Key or RGB. You can choose None to not use the key
color option at all. You can choose Auto Key have the system
automatically "make transparent" the background color. The
system selects the color in the upper left most corner of the
image to determine which color to remove. In most instances,
Auto Key will be the easiest to use and most effective "make
transparent" method. Or you can choose to manually set the
RGB (Red, Green and Blue) key color level. The RGB option
requires you to know the specific RGB value of the color you
would like to "make transparent".
NOTE
Use a solid background (one color) in your graphic
overlays for the Auto key feature to work properly.
NOTE
Entering your own RGB values for the key color feature
only works with 8 bit bitmap graphics less than or equal to
720x480 resolution.
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