Albie

Andy/Robin, thank you so much for your kind help and for processing my data, it shown me it's not my data, but my poor processing. After Robin's post I've been thinking hard as to what the difference is between the DSLR & ASi camera processing that I do different. Turns out its SCNR green removal. I've been doing a linked STF on the image after integrating (just pressing the STF button) and it was coming up very very green, so I was removing it with SCNR, but was taking far too much out. Should have been stretching in un-linked mode and then the reds come out ok, with no green cast. If I was near a wall i'd bang my head against it. I've got a lot of past images to go back and correct now. thats Christmas holidays sorted. As for filter leakage, that I can sort, it's not usual in my images. Thanks Again for your help. Alan

Fegato, thanks, more like the colours I'd expect so its not the images then. Also thanks for the tip on flats will take note for future. Will have to look at how I calibrate. I've been using weighted batch preprocessing recently, but was getting the same results when done manually. When I look back I've probably always had this issue with this camera. Funny that images taken with DSLR are generally OK and I work them the same way.

Sorry, changed the link now to general access. I process in Pixinsight, which includes colour calibration - even ran the new Spectographic Colour calibration. but get same results. Normal operations: Dynamic background extraction Background Neutralisation Image solve Spectographic colour calibration (previously with Photometric colour calibration, but same results) Noise XTerminator Then Stretch before tweaking the stretched image for satruration, star size etc.

Andy, Link to M42 files & cal files (ignore the horrible loop on LHS!) https://drive.google.com/drive/folders/1mmtT3KpbcUBTcghcEr37zjiI99IMC0gk?usp=sharing Thanks Alan

Hi thanks for your responses. I have checked the Bayer matrix and it's definately RGGB, so its not that i believe. Tried in auto and forced as RGGB, same results.

Hi I've been imaging for a while with both a (modded) dslr and a ZWO ASI294C. I notice all my nebula images which I would expect to be red (which are red when using my dslr) come out an orange/brown color when using my ASi294 one shot colour camera. I use the same processing train for both types of images. Can anyone suggest why the colours are so different and how I could get them to match? Heres some examples of M42 and crescent nebula taken with asi camera recently.