ZWO ASI533mc Bayer Pattern

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Rab722
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Joined: Mon Mar 02, 2020 12:20 pm

ZWO ASI533mc Bayer Pattern

Post by Rab722 » Thu Apr 09, 2020 1:12 pm

When I load my fits files into APP it says the bayer pattern is BGGR. The website for ZWO says its RGGB. Which is it and does it matter.

Also my dark and flat files do not have the exposure and gains in the headers so an error is displayed.

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Re: ZWO ASI533mc Bayer Pattern

Post by admin » Thu Apr 09, 2020 5:56 pm

Hi,

In theory, fits images are supposed to start in the bottom left corner, whereas camera manufacturers usually think of the pattern starting from the top left corner. That would account for a swap between RGGB and GBRG, but not the swap that you are seeing. On the other hand though, I know of different pieces of processing software that have different ideas about what the pattern is in the same fits file – for instance pixinsight and AstroArt disagree on that. The long and short of it is that it's not worth worrying about... as long as the colours come out correctly you have found the right setting.

While in theory you can use darks and flats captured in the SharpCap tools for postprocessing and other programs, in general I tend to try and do all the processing in the same place – that is if I'm going to use DSS for stacking the light frames I will let DSS do the creation of the master flatt and master dark as well. The reason for this is to ensure that all the frames are treated in exactly the same way to achieve best results. That being said, I will try to arrange for the settings info from the individual frames to make it through into the averaged dark/flat frames in a future version of SharpCap.

Cheers, Robin

Rab722
Posts: 16
Joined: Mon Mar 02, 2020 12:20 pm

Re: ZWO ASI533mc Bayer Pattern

Post by Rab722 » Fri Apr 10, 2020 1:43 am

I investigated the Bayer pattern further for the ZWO ASI533mc. I placed red electrical tape over the end of the sensor and did a screen capture to a fits file. Then did the same with blue tape. SharpCap was displaying the proper colors. I found that in both Fitswork and Pixinsight the Debayer pattern needed to get the correct color was GRBG. The Auto setting for the Bayer/mosaic pattern in Pixinsight did not work and gave the wrong color.

Rick

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