QHY5III Series
For example, in this image the blue is 255 and red is 161, green is 128. It looks the color is well
white balanced. If you need more blue, since it has reach to 255 and you can not get more. In
this condition, you can reduce the green a little and you will have more room for the ratio.
As we said before. If you are doing planetary imaging you should set the offset value as low as
possible. To make the background close to zero. Then you can easy to get correct color balance.
Otherwise it will not easy to get it. The following image shows the offset is good and you can not
get good balance.
The reason is that the Color balance is a ratio of the RGB sensitivity difference. So we use a ratio
to multiple the RGB value and get it done. But if there is a bias exist. The ratio will not be correct.
For example, the G sensitivity is two times than R.
G=2R In order to get white balance. We multiply a ratio of 2 to R
R’=2R= G so we get R=G
When a bias exist. The bias is a constant add to each pixel. So the image you see is:
R’’=R+bias
G’’=G+bias=2R+bias
Summary of Contents for QHY5III174C
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