Strange pattern in rendered DNG file

Announcement of new releases, bugs, support, suggestions
Post Reply
twhizzle
Posts: 5
Joined: 23.06.2020 20:53

Strange pattern in rendered DNG file

Post by twhizzle » 23.06.2020 21:01

Hello there,

I'm new to Helicon Focus Pro and unfortunately I have already found a problem which I cannot get rid of. Whenever I try to render an image stack from DNG files (Fujifilm X-T2 RAW files exported from Lightroom via DNG), I get a strange pattern all over the image, no matter which rendering method or radius/smoothing settings I use. It makes the output file unusable. See attached image. When I use the same images but in JPEG format instead of DNG, this error does not occur.

Am I doing something wrong or is this an error of Helicon Focus Pro?

Greetings
Thomas
Attachments
Bildschirmfoto 2020-06-23 um 20.49.15.png
(389.43 KiB) Not downloaded yet

twhizzle
Posts: 5
Joined: 23.06.2020 20:53

Re: Strange pattern in rendered DNG file

Post by twhizzle » 02.07.2020 21:39

Anyone?

User avatar
Catherine
Posts: 384
Joined: 29.04.2019 22:38

Re: Strange pattern in rendered DNG file

Post by Catherine » 03.07.2020 19:02

We've managed to reproduce the problem, but we need a bit more time to understand if the problem is about Helicon Focus or about Lightroom. We are investigating this further and will let you know about our findings and solutions

twhizzle
Posts: 5
Joined: 23.06.2020 20:53

Re: Strange pattern in rendered DNG file

Post by twhizzle » 04.07.2020 14:37

Hello Catherine,

thank you for your answer. Looking forward to reading your finding and a possible solution for that.
Is this unique to Fujifilm .RAF files or were you able to reproduce this with raw files from other camera manufacturers as well? By the way, I also tried it with .RAF files from a Fujifilm X-T4, with the same result as with the X-T2 files.

Have a great weekend.
Thomas

BobStone
Posts: 44
Joined: 03.06.2017 10:13

Re: Strange pattern in rendered DNG file

Post by BobStone » 05.07.2020 08:55

Pardon me for jumping in - This seems likely to be due to the X-Trans sensor's unusual 6x6 filter array in the raw image. (A lot of RAW software has this issue. There's a nice entry on Wikipedia.) This explains why your JPG works fine. A 16-bit TIF export might be a better choice to retain the dynamic range of the image. The free RawTherapee software can de-mosaic this sensor, not sure if it can save as a DNG, but perhaps worth a look.

twhizzle
Posts: 5
Joined: 23.06.2020 20:53

Re: Strange pattern in rendered DNG file

Post by twhizzle » 05.07.2020 12:39

Bob,

absolutely no need to be sorry - thanks for your input! I have also thought about X-Trans being part of the problem. Just not sure, where the real problem starts (ACR RAW conversion can't be the problem as I do all my editing in LR and PS and I have never encountered a problem like this). I will definitely try your suggestion of using 16-bit TIF.
Still, I am looking forward to the solution of this problem, as I really like to be able to do RAW editing after focus stacking (what RAW-in-DNG-out was meant for).

Thanks again!

Thomas

User avatar
Catherine
Posts: 384
Joined: 29.04.2019 22:38

Re: Strange pattern in rendered DNG file

Post by Catherine » 24.07.2020 09:51

We are still not sure where the problem originates. We're in the process of updating the DNG toolkit (the part that is inside the Helicon Focus application), maybe it will resolve the problem. If not, we will investigate further.

twhizzle
Posts: 5
Joined: 23.06.2020 20:53

Re: Strange pattern in rendered DNG file

Post by twhizzle » 26.07.2020 18:58

Hi Catherine,

thank you for the information! Hope that you'll be able to find a solution for that.

Thanks again!

Post Reply