What is the difference between ACR 4.6 and Adobe Standard

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Under camera profile, what is the difference between ACR 4.6 and Adobe Standard?
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Photographe

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  • confused

Posted 7 years ago

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Ian Lyons, Champion

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They produce different colour renderings. Profiles labelled ACR4.6 or before predated the introduction of Adobe Standard and other camera profiles such as Camera Standard, Camera Faithful, Camera Neutral ,etc.

BTw: this question is more suited for asking on Lightroom User to User forum http://forums.adobe.com/community/lig...
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Rob Cole

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One big difference:

ACR 4.X profiles are linear, Adobe Standard is twisted.

Technical details can be had by searching the net for "Sandy McGuffog dcpTool".

Note: Highlight recovery preserves hue integrity when used with the ACR profiles, but may induce unwanted hue shifts when used with the twisties (which includes some (all?) of the camera profiles too).

PS - I have ACR 4.3 & 4.4 - do you really have a 4.6?

Rob
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Mark Sirota

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Rob, the version number that shows up in the "ACR" profiles is the version of Camera Raw that was current when that profile was developed. Older cameras will have a lower number.
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Rob Cole

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Thanks Mark.
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Photographe

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Thanks Rob. That's exactly the answer I was looking for (and now I remember what prompted my question--I read somewhere about the twisties).

I wonder about the hue shifts--are they caused perhaps because one of the channels was blown? Does your camera have an RGB histogram? (Yes, I do have ACR 4.6, which as Mark explained corresponds to ACR in effect when the profile for the camera was produced. I did not know this.)
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Rob Cole

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I don't have a good understanding of the cause. But I *think* I've noticed it on photos with all 3 channels intact as well - will keep on the lookout...

PS - Some people use highlight recovery strictly as a way to unclip the highlights, but its also useful as a general toning tool, to "reduce contrast" starting at the top end - analogous to fill-light at the bottom end.
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Rob Cole

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Update: highlight recovery problem varies with camera model.
For Nikon D300 - it has been fixed.