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Color calibration, correct black point on different systems for Affinity Photo


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Hello,

I'm not sure, if my inquiry is placed correctly here but let me try. I'm doing astrophotography and usually any misses in the correct black point are becoming quickly obvious. 

I have two computers. System A is a desktop computer with Windows 11. Monitor is color calibrated. I'm doing some image editing in PixInsight and then switch to Affinity Photo. Images are 32-bit floating point tiff. System B is a macbook Pro with external Monitor (the same device as for system A) both displays color calibrated with the same tool (Spyder X Pro).

Following problem. On System A, the images in PixInsight (left) and Affinity Photo (32bit with ICC Color Transform enabled) appear absolutely identical:

570631302_Screenshot2022-05-23172557.jpg.7ee0d7a8186c15d7cd20432c0283d04e.jpg

On macos, the images look different (Affinity left, PixInsight right). The background has much more contrast. The settings for both applications on both systems are identical!

1589183662_Screenshot2022-05-23at17_08_00.thumb.png.9e9af5a50d4a9ab16ac74cd34b563fde.png

If I export the image from Affinity on macos and watch it with the preview application, it appears like in Affinity Photo. Obviously, the blackpoint on macos looks darker.

Somehow, there is something wrong. I should say that the black point for PixInsight remains constant across systems, while for Affinity it changes. To me, it seems that something is flawed on the macOS side.

Has anyone noted the same issue? My impression is that the color management on macOS has an issue and Affinity relies on it.

If I can provide further info, please let me know.

As far as I can say: working with Affinity on macOS is a no-go for this case as for this type of photography, the background becomes way too noisy. I need to work on the Windows machine to achieve consistent results between different applications.

Björn

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On 5/24/2022 at 3:09 PM, stokerg said:

Hi @barnold84,

Could you upload the images you are using to our Dropbox here and i'll see if i can replicate the issue.

I know we have a few Astrophotography users on MacOS who haven't reported anything like this that i can see.

@stokerg,

did you receive the data and had a chance to take a first look?

Björn

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Hi @barnold84,

9 minutes ago, barnold84 said:

did you receive the data and had a chance to take a first look?

 

Yup i've got the files.  I'm just waiting on comment from one of our experts on what exactly is happening here, mainly if its MacOS or Affinity that has the issue or if it could be something else.  I'll update here as soon as i know more :) 

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