Quote:
Originally Posted by Ittaku
Here's something that demonstrates the problem with green offset being negative without true green control. This is looking at a bright green card. The colour values aren't equivalent so ignore the histogram peak discrepancies. First is with ZWO green offset to very negative. Second is with QHY and the green set so low that it registers only about as much as the blue channel, yet it's still a smooth graph without the abrupt cut off. I picked this up the hard way on the ZWO the first time with a whole lot of stuffed Mars captures.
|
Not knowing exactly how you tested this it's difficult to comment, but I would have expected that the green signal would be very high if your were imaging a bright green card. However, it appears to me that the gain on the ZWO ASI224 is set too high if you are seeing clipping in the green, and no amount of offset in FC can fix this. A better test would be a colour checker chart (if you have one) or a colourful shirt (even the old ABC test pattern
).
https://www.redbubble.com/i/sticker/...23011194.EHVJB