Maze like pattern on photos

raff89 · 03-14-2017, 01:23 AM

Originally posted by Culture

I have never seen this problem. But I guess I should keep my eye open.

Can I request this to be moved to the Pentax Linux club later for referencing sake. This is good information here.

I checked RawTherapee on Windows and the patters is there too. Now I am convinced that the issue is caused by the demosaicing algo.
Feel free to share my post.
VNG4 algorithm does not produce aforementioned pattern.
As for the suggestions that the output resolution might have something to do with the problem, I can see the pattern on many zoom levels in the editor view port and in exported output with couple of crop sizes.

dannny · 03-14-2017, 04:06 AM

I think It would be good to report this to the developers, so they may fix the issue,

**BigMackCam** · 03-14-2017, 04:41 AM

Originally posted by dannny

I think It would be good to report this to the developers, so they may fix the issue,

I don't think it's a fault or problem with the software, per se. It's the way certain demosaicing algorithms work. I'm not sure what the various advantages or disadvantages are of each algorithm, but this is why - in some software (RawTherapee, for example) a choice of algorithms is offered...

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03-14-2017, 01:23 AM	#16
raff89 Junior Member Join Date: Apr 2015 Posts: 48 Original Poster	Originally posted by Culture I have never seen this problem. But I guess I should keep my eye open. Can I request this to be moved to the Pentax Linux club later for referencing sake. This is good information here. I checked RawTherapee on Windows and the patters is there too. Now I am convinced that the issue is caused by the demosaicing algo. Feel free to share my post. VNG4 algorithm does not produce aforementioned pattern. As for the suggestions that the output resolution might have something to do with the problem, I can see the pattern on many zoom levels in the editor view port and in exported output with couple of crop sizes.

03-14-2017, 04:06 AM	#17
dannny New Member Join Date: Jan 2017 Posts: 5	I think It would be good to report this to the developers, so they may fix the issue,

03-14-2017, 04:41 AM	#18
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,695	Originally posted by dannny I think It would be good to report this to the developers, so they may fix the issue, I don't think it's a fault or problem with the software, per se. It's the way certain demosaicing algorithms work. I'm not sure what the various advantages or disadvantages are of each algorithm, but this is why - in some software (RawTherapee, for example) a choice of algorithms is offered...