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ja14000

RAW File looks bad

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Hi, 

 

Certain raw files from my Sony a6000 look very bad but only in affinity.

 

Steps to reproduce the problem:

 

Import the raw file into affinity and increase the exposure until you can see the sand on the beach in the bottom half of the image. It will look incredibly blurry, this is not how it looks anywhere else e.g. Lightroom or capture one for Mac.

 

To see the difference import the raw file into either capture one or photoshop and increase the exposure, you will see that the image is not blurry at all.

 

I've tried viewing the image at 100% to ensure that mitmaping is not an issue but this did not resolve the issue. I also tried exporting the raw file as a jpeg to see if the error is just in the preview but the exported jpeg is incredibly blurry as well.

 

I've attached the raw file for you to take a look at, I will follow up with some jpegs from capture one to show what the image should look like.

DSC02455.ARW

 

Here is a link to an imgur album that contains exports of the raw file from both affinity for iPad and capture one for Mac: https://imgur.com/a/revc7

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One last thing, I've added a jpeg export from affinity for iPad to the imager album so you can see the difference. (It's the middle one in the album)

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Feels like I'm talking to myself here but I'll keep going.

 

Exporting the RAW file as a DNG using the adobe RAW to DNG converter tool and importing the DNG into affinity:- still blurry.

Exporting the RAW file as a DNG using capture one for Mac and importing the DNG into affinity - not blurry.

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Hi, I've tried the RAW file on the iPad version of Photo and you're correct, it looks incredibly bad. It seems to be an issue with how Apple's Core Image RAW decoder is handling the file, since we use that engine exclusively on the iPad version. Switching to it on the desktop version of Photo yields similar results but without the blurriness; the purple and green chromatic noise is still there.

 

The Serif Labs engine on desktop handles the image fine. The image is heavily underexposed; do you have any similar images that exhibit the same issues? What happens with images shot under better lighting conditions?

 

Quote

Exporting the RAW file as a DNG using the adobe RAW to DNG converter tool and importing the DNG into affinity:- still blurry.

Exporting the RAW file as a DNG using capture one for Mac and importing the DNG into affinity - not blurry.

 

This is possibly because Capture One's DNG export has already demosaiced and applied some processing to the image using its own methods. I'm not sure to what extent Adobe's DNG converter manipulates the image.

 

Not sure what to suggest yet, but if you have any other samples shot with your camera they would be useful to help determine what circumstances cause the issue. I've tried some RAW samples from PhotographyBLOG and I can't reproduce the blurriness, even with shots at ISO 6400 or 12,800. It did surprise me that there was chrominance noise - Apple's RAW engine usually removes that - but there was nothing as bad as the result of the image you've provided. I notice you've mentioned "certain raw files" at the beginning of your post; is there a correlation here? Are they mostly underexposed? If so, clearly there's something off about the way Apple's RAW engine is handling them.


Affinity Photo Video Tutorials - Affinity Photo for iPad Tutorials

Looking for a manual/documentation? Check affinity.help for online help!

@JamesR_Affinity for tutorial sneak peeks and more

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14 hours ago, James Ritson said:

Hi, I've tried the RAW file on the iPad version of Photo and you're correct, it looks incredibly bad. It seems to be an issue with how Apple's Core Image RAW decoder is handling the file, since we use that engine exclusively on the iPad version. Switching to it on the desktop version of Photo yields similar results but without the blurriness; the purple and green chromatic noise is still there.

 

The Serif Labs engine on desktop handles the image fine. The image is heavily underexposed; do you have any similar images that exhibit the same issues? What happens with images shot under better lighting conditions?

 

 

This is possibly because Capture One's DNG export has already demosaiced and applied some processing to the image using its own methods. I'm not sure to what extent Adobe's DNG converter manipulates the image.

 

Not sure what to suggest yet, but if you have any other samples shot with your camera they would be useful to help determine what circumstances cause the issue. I've tried some RAW samples from PhotographyBLOG and I can't reproduce the blurriness, even with shots at ISO 6400 or 12,800. It did surprise me that there was chrominance noise - Apple's RAW engine usually removes that - but there was nothing as bad as the result of the image you've provided. I notice you've mentioned "certain raw files" at the beginning of your post; is there a correlation here? Are they mostly underexposed? If so, clearly there's something off about the way Apple's RAW engine is handling them.

 

 

 

Hi James, 

 

Thanks for your response, the issue has appeared 5 images however they were all taken in quick succession of one another and were of the same subject, and all were very under exposed.

 

I've only been using affinity for a week or so and have only tried about  two dozen images but out of all of the images I have tried I have only had issues with the five taken of this subject on that day from that angle (they were taken at varying shutter speeds and apertures however). 

 

Hopefully this remains an isolated issue, I could upload the other four raw files if that would help?

 

Thanks, 

 

John

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Your post just prompted me to look through some of the files I discarded, looking at all of the under exposed ones the issue appears in all of them but to a much lesser degree. If I look at the sand in any of the under exposed photos the sand is blurry (the rest of the image is fine in most of them) however if I look at the same raw file in capture one the sand is sharp.

 

I've started the uploads of the files in question, they'll take a while but I'll post the link when they are done.

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