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AiDon

CR3 M50 - too much Magenta Tint

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Hi, It seems that the Magenta Tint setting for images shot with WB set to Auto: White Priority in camera is excessive during processing as you can see here:

image.thumb.png.0285cd7a8bc54bee57284916f7414703.png

In this image the Tint doesn't seem to disappear until approx 3% (down from 16%) and the colors get better at 0%, but OK at -3%  ...

image.thumb.png.d0927998a115ea651b4a8ca3a224175d.png

 


Win 10 x64 System with Intuos Pen & Touch
 - Sys : Intel® Core™ i7-7700HQ CPU @ 2.80GHz (8 CPUs), 16GB RAM
 - GPU 1: Intel HD Graphics 630, GPU 2: NVIDIA GTX1050, 4GB

 

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As I understand it, when processing the raw images Affinity Photo (on Windows, or on Mac when using the Serif Raw Engine) shows you the raw data. The WB you specify while shooting would affect the JPEG preview, or a JPEG image produced by the camera, but does not affect the raw data itself. And, again as I understand it, Photo expects you to handle any necessary white balance or other color corrections manually.


-- Walt

Windows 10 Home, version 1903 (18362.356), 16GB memory, Intel Core i7-6700K @ 4.00Gz, GeForce GTX 970
Affinity Photo 1.7.3.481 and 1.8.0.486 Beta   / Affinity Designer 1.7.3.481 and 1.8.0.486 Beta  / Affinity Publisher 1.7.3.481 and 1.8.0.502 Beta

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1 hour ago, walt.farrell said:

The WB you specify while shooting would affect the JPEG preview, or a JPEG image produced by the camera, but does not affect the raw data itself. And, again as I understand it, Photo expects you to handle any necessary white balance or other color corrections manually.

Well the issue here is that AP isn't interpreting the RAW data correctly, and I am sure that they will perfect it. In fact all RAW processors interpret RAW data and mostly different to each other but not with an obvious tint or color cast. Note that the WB set to Auto: White Priority on other cameras such as the EOS 5DsR are interpreted correctly.


Win 10 x64 System with Intuos Pen & Touch
 - Sys : Intel® Core™ i7-7700HQ CPU @ 2.80GHz (8 CPUs), 16GB RAM
 - GPU 1: Intel HD Graphics 630, GPU 2: NVIDIA GTX1050, 4GB

 

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Hi AiDon,

I've seen a few reports of unexpected magenta casts on certain raw files. I suspect this is the same so I've added it to the bug report.

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Hi Chris, If you want some test images just let me know. I can upload them to Dropbox for you.

Don.


Win 10 x64 System with Intuos Pen & Touch
 - Sys : Intel® Core™ i7-7700HQ CPU @ 2.80GHz (8 CPUs), 16GB RAM
 - GPU 1: Intel HD Graphics 630, GPU 2: NVIDIA GTX1050, 4GB

 

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OK Chris, uploaded file CR3 AWB-White Priority Magenta Tint.zip which has 2 for starters. Can find more if you like.

Regards, Don


Win 10 x64 System with Intuos Pen & Touch
 - Sys : Intel® Core™ i7-7700HQ CPU @ 2.80GHz (8 CPUs), 16GB RAM
 - GPU 1: Intel HD Graphics 630, GPU 2: NVIDIA GTX1050, 4GB

 

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