SharpCap Forums

SvBoyn says their SV305 (imx290) uses a GRGB color matrix. I can't find a setting or log entry that shows what color filter SC is detecting/using. Lacking that information I thought maybe I could force it using the Debayer Preview, but GRGB is not a choice.

Can someone deconfuse me?

Hi,

I suspect that GRGB is just error on their documentation - in almost all sensors the two green pixels are at opposite corners of the 2 x 2 grid, so you have

GR
BG

or

BG
GR

but not

GR
GB

This is certainly the case for the IMX 290 sensor.

Cheers, Robin

Thanks, Robin, I suspected as much.

Can I just assume, then, that SharfpCap 'knows' the correct matrix?

This all comes up because I'm struggling to get colors right. M42, for example, comes out all green using RGB24 colorspace and saving as FITS16

Have a read of viewtopic.php?f=35&t=254 for some background.

It would be helpful to publish your full workflow from capture through processing, including the camera settings file.

Dave

turfpit wrote: Thu Apr 09, 2020 9:23 pm Have a read of viewtopic.php?f=35&t=254 for some background.

I have read that, thank you.

That said, I know there's a gap in my knowledge (many, really), so I'm basically cookbooking my way through the process. It's not for lacking of reading and studying, but in the immortal words of one of the Three Stooges, "I'm thinkin' but nothing happens!"

I used the Monitor Folder Camera in SharpCap to align and stack saved FITS files and saved the stack as a 32-bit FITS file for processing with StarTools with special attention in the Color module. Of course, I can make it any color I want by playing with the RGB sliders in SharpCap and color bias sliders and the Cap Green filter in StarTools.
But my desire is to make the image look as natural as possible--to see what the camera saw (influenced by light pollution, admittedly).

Setting for green image in previous post
[SVBONY SV305]
Output Format=FITS files (*.fits)
Colour Space=RGB24
Capture Area=1920x1080
Pan=0
Tilt=0
Black Level=251
USB Speed=1
Frame Rate Limit=Maximum
Gain=20.4
Exposure=1
Timestamp Frames=Off
White Bal (B)=400
White Bal (G)=400
White Bal (R)=400
Sharpness=100
Saturation=51
Gamma=1.08
Contrast=93
Banding Threshold=35
Banding Suppression=0
Apply Flat=None
Subtract Dark=None
#Black Point
Display Black Point=0.19140625
#MidTone Point
Display MidTone Point=0.515625
#White Point
Display White Point=0.83984375
TimeStamp=2020-03-22T05:12:11.2721327Z
SharpCapVersion=3.2.6248.0
TotalExposure(s)=790
StackedFrames=790

How I made progress when I ran into this was to select a land based object and image that during the daytime. I chose a view that had a green tree, blue sky and a red brick building. At least when I tried to process that capture, I knew what the result should be.

Dave

turfpit wrote: Fri Apr 10, 2020 9:37 am How I made progress when I ran into this was to select a land based object and image that during the daytime. I chose a view that had a green tree, blue sky and a red brick building. At least when I tried to process that capture, I knew what the result should be.

Ah, good idea. I'll do that!