ASIAIR PLUS green images

taurus81

Images have a green tint. Tried auto white balance on and off but no help as well as numerous other settings. I did notice after changing the camera setting from RAW to RAW/L, which saves picture in both RAW and jpeg, the color is correct. I do get an error message "Image Format Setting Error". PLEASE HELP!

w7ay

taurus81 Tried auto white balance on and off but no help as well as numerous other settings.

RAW images are just that, data that is collected originally by turning photons into electrical currents. It does not, and should not, be alterable by any settings such as white balances; otherwise it could no longer be called RAW.

RAW images from CMOS cameras do not have color. Every pixel is monochrome, overlaid by a Bayer mosaic.

Color balance is applied when you create a non-RAW (e.g., JPEG) full color image from a RAW image.

If you see a green tint, it is possible that whatever program that you use for debayering did not account for the fact that each Bayer superpixel contains two green subpixels, but only one red and one blue subpixel. Or, it could just be that the quantum efficiency of the sensor is higher at the green wavelengths (usually true).

Just apply color balancing after you post process the RAW image(s).

Chen

taurus81

Forgot to mention that the camera is a DSLR Canon 450D.

taurus81

Hello Chen,

I apologize for not providing more information. The green tint shows up during Focus, Preview and also Live so there has not been any processing other than what ASIAIR might be doing during these times. I am using an iPad to control the unit.

Gary

w7ay

taurus81 The green tint shows up during Focus, Preview and also Live so there has not been any processing other than what ASIAIR might be doing during these times.

Gary: And that is because what you see came from a RAW image, and has not been color balanced.

There is a rudimentary color balancing (like everything in ASIAIR, it only works for the simplest cases, and can create even worst green casts on certain images) in ASIAIR. Go to the Camera Settings, select Advanced Setting, then turn on Auto White Balance on Screen.

It will not alter your RAW image, It does some simple histogram equalization before displaying images on the ASIAIR windows. Just don't expect it to work as well as the color balancing that you get from your camera when it created the JPEG.

Chen

taurus81

Chen, Fixed! I turned on the Advanced Setting, then turned on Auto White Balance on Screen as you suggested. Took some terrestrial shots and the pics look good. Thank you very much.

I am looking for instructions for the Plus which are more detailed by describing all or morel of the button selections than what I have seen on Youtube and have found on the ZWO site. Is there such a document? I never would have guessed the fix you suggested.

Gary