alex_722625's profile

11 Messages

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176 Points

Sun, Jul 21, 2019 2:04 PM

Demosaicing Issue in Raw Files from Sony A7R III

I recently upgraded from an A7R II to a RIII. Made the change right around the time that the new Texture feature was updated and the enhance details changes went live: https://theblog.adobe.com/enhance-details/

After a trip to Scotland to test the Camera I immediately noticed that in photos of bluebells the seams were jagged and color bleed was messy. Later when photographing a local Carnival parade, I again encountered issues where on zoom image quality felt like an over-compressed JPG. When asking initially in various Sony groups (concerned it was a defective camera), most wrongly assumed it was tied to issues with the lens or general diffraction. Further experimentation confirmed it was present across focal lengths, and all three of my lenses: 70-300MM, 50mm F1.8, and 24-70 F4 as well as at high and low F stops.

It was then that one user pointed out that it was a demosaicing issue, noting it was one of the worst cases he'd seen of it/explanation here: https://rawpedia.rawtherapee.com/Demosaicing?fbclid=IwAR3K9iMVH01YkJvn-e1uKXEo39bpymtfKKLu0RNb7svKyN6sVPKUwKteGJM#Introduction and the full thread with early examples here: https://www.facebook.com/groups/sonyalphacamera/permalink/912291675797921/

I just returned from photographing another trip in Colorado and am seeing similar challenges on dune shots - example here:
adobe.ly/2YkEOe8 particularly in this area:
 https://ton.twitter.com/1.1/ton/data/dm/1152913098963083273/1152913093552484352/wjbW59Gm.jpg:large

It's worst when it comes to colors, but also seems to destroy finer details that should otherwise be crisp. 

I'd love any ideas on fixes, suggestions, ideas on what to do about it, or alternative solutions. 

Would also be very curious if any other A7R III users are finding and flagging the same issue on detailed inspection of their RAWs or not.

The Camera has the latest firmware, is less than 4 months old, and all gear is in great shape / don't recall having any such similar issues on the A7R II.


 

Responses

Champion

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3.7K Messages

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61K Points

2 y ago

What profile do you use? I have seen discussions about poor quality with the Camera Matching profiles. I have a Sony A7R III myself and I always use Adobe Landscape. Results are great.

11 Messages

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176 Points

2 y ago

Adding additional examples:
RAW 2: https://adobe.ly/2YpEE5D
RAW 3: https://adobe.ly/2K7rOQj

Screenshot examples from the above:



Champion

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2.4K Messages

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39K Points

2 y ago

I'm not seeing any issues in the above two ARW files at 1:1 Zoom view using the Adobe camera profiles. The Camera matching profiles look quite different, which leads me to believe they may have an issue. Can you post 1:1 screenshots with a description of what we should look for.

Sorry, I see you've already done that in your last post. All I see is some out of focus areas due to depth of field. with no demosaicing issues or artifacts.

Here's Adobe Landscape (L) and Camera Landscape (R) with 'Auto' Tone applied. All other settings are at their defaults.

1:1 Zoom View