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Adjust Gains
1.Select the Gains-ClackBlack-Shade-Flat tab.
2. Click Start Grab.
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8. Keep an eye on the graph on the bottom left corner. We want all the colors to overlay eachother each other pretty closely.
9. When the colors all seem well balanced you can move on to the next step. How long the lights have been will affect the color balance. If the lights have gotten quite warm and everything looks even, then when the lights are 'cold' the blue channel will be lower than the others.
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If you haven’t set the camera’s height, now is the times time to do so! See the section Camera Height Adjustment at the end.
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- Exposure intervals for the Red, Green and Blue channels is a function of the light intensity of the LEDs.
- Led intensity for the three channels is a function of the LED spectrum. Cold lights 65K are very blue while warm lights 55k are reddish. Neutral light is preferred where RGB are nearly equal but all leds are variable. Generally red is the lowest intensity and will require the longest exposure time. That is why in the above procedure we start with red, but you should always start with lowest intensity channel.
- Intensity is also a function of the F-stop. The smallest F-Top is preferred because it gives the greatest depth of focus but also lowers the intensity.
- Intensity is also a function of how closely coupled the lights are to the core surface but for practical reasons we need to keep a minimum clearance for safe operations.
- Don’t forget to check that all of the lights are evenly illuminated or even on. One led can fail without affecting these other. Don’t ever look at the leds directly!
- Line rate must be greater (20us) than the red, green and blue exposure rates set in the above procedure.
- The shorter the line rates the faster the image can be scanned.
- If you move the track faster than the scan rate you will see dropped lies lines in your image.
So you must balance all of these setting to obtain the best scanning rate. That means the above White balance procedure described above may have to be repeated as you adjust light position, f-stop etcetera.
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