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Author Topic: Joseph Holmes color profiles  (Read 1012 times)

David Eckels

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Joseph Holmes color profiles
« on: December 15, 2021, 09:41:31 am »

Has anyone here had experience with profiles by Joseph Holmes, such as DCam 5? Any thoughts about his ideas?
https://assets.josephholmes.com/profiles/about-my-profiles

digitaldog

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Re: Joseph Holmes color profiles
« Reply #1 on: December 15, 2021, 11:20:37 am »

My question to you is, shooting raw and processing in what converter?
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David Eckels

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Re: Joseph Holmes color profiles
« Reply #2 on: December 16, 2021, 10:26:56 am »

Thanks for your reply Andrew. I would be using LR and shooting raw of course. I came across his name in an Elements article and was interested in whether Holmes' slightly larger* gamut and linear gamma would actually be discernible to the naked eye. If anybody would know, you would.
*than ProPhoto

digitaldog

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Re: Joseph Holmes color profiles
« Reply #3 on: December 16, 2021, 01:23:43 pm »

The internal color space is what it is (ProPhoto RGB variant) not sure what rendering in anything else would bring to the table.
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fdisilvestro

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Re: Joseph Holmes color profiles
« Reply #4 on: December 17, 2021, 03:03:28 pm »

Disclaimer: I'm not an expert and I cannot tell you if the results are better or worse. I just started playing around with DCam 3 a short while ago.

The interesting idea behind the DCAMx profiles are the "Chroma variants", which is a different way to change the saturation in the image, in a way that is difficult to achieve with the standard saturation control. I'm not sure how this affects colour fidelity, it is more about getting a pleasing result.

In regards to the gamut volume, DCAM 5 is extremely large, and to me is more a mathematical exercise to achieve a colour space that includes all visible colours. I would consider DCam 4 or Dcam 3 as more "general purpose" spaces, mainly for landscape / natural environments.

With regards to the gamma curve, it is not linear but a proprietary curve that J Holmes would not disclose the details. He claims it gives better results in the deep shadows among others (I have not performed any tests in this regards).

Regarding raw converters, LR does not allow you to select the DCam x profile with the standard "Open in PS" function, so you'd have to export to tiff and then open in PS. In contrast, ACR allows you to chose any profile, same with C1.


David Eckels

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Re: Joseph Holmes color profiles
« Reply #5 on: December 22, 2021, 09:30:30 am »

Frank, Andrew, thanks for the info. Sounds to me like it may not be worth the effort.
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