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Deficient handling of areas of blacks and shadows in ACR

Forum|Forum|7 years ago
September 23, 2018
6 replies
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Recently I was playing trying to reveal a hidden text in an underexposed area. Camera RAW could not show it while other programs including the Preview utility in Mac OSX and Luminar, Exposure, Affinity and CaptureOne did it without problems. I have always thought that Photoshop and Camera RAW are the parents, the origin of the other programs, so it is hard for me to take on this problem that on the other hand may not be so serious.

If I open the JPG file directly in PS and then I go to ACR, no problem the text can be seen moving some controls; but if I open the file directly in Camera RAW, it is not possible.

I'm a Mac user and all the software involved is up to date.

I attach the test file.

Thanks in advance for your attention.

Please feel free to see this 30 sec video

This topic has been closed for replies.

Correct answer ssprengel

https://forums.adobe.com/people/Chuck+Uebele wrote
Andrew, I zoomed in and out, and it mad no difference. When I opened the image from ACR to PS, it still had the bad compression, as seen in the ACR preview, where as the image opened straight into PS did not. So I would agree with you about a bug that Adobe needs to fix.

Wonder if futzing with GPU preference's make a difference and perhaps the nature of the display profile too (V2 vs. V4, LUT vs. Matrix etc)?

CarlosGordillo,is this initially a raw and if so, can you upload for others to test?

The OP is describing a problem with JPG-handling in the ACR plug-in.

The JPG under question is in the first post, just download and try it for yourself. This has nothing to do with raw processing.

More significantly, LR acts the same, so there's no way to get to the darkest few tones when editing a JPG.

CarlosGordilloAuthor

Known Participant

Thanks for the clarification. However, the problem is solved

CarlosGordilloAuthor

Known Participant

Today Adobe released Ps 20.0.2 It seems that this problem has been corrected. Thank you Adobe.

"The raw metadata for some Photoshop files has excessive number of entries of 'photoshop:DocumentAncestors'"

D Fosse

Community Expert

If it has been fixed, it has nothing to do with DocumentAncestors - which does not apply to raw files from a camera. That's an issue with excessive amounts of edit history metadata, bloating file sizes.

The problem with the black scaled profile is apparently that it interferes with normal Black Point Compensation - a standardized procedure that works very well when left to its own devices. I suspect the black scaled profile is intended to be used with applications that don't do BPC at all.

D Fosse

Community Expert

The OP's file has the "sRGB IEC61966-2.1 black scaled" profile embedded.

This is not the standard sRGB profile, and it's caused problems for people before. I've never used it myself, but it pops up in the Photoshop forum every once in a blue moon.

CarlosGordilloAuthor

Known Participant

Thanks for your response.

So the point here is: there is a problem, with the file with the black scaled sRGB profile if you want. A problem that others programs, including the utility "Preview" in OSX and many others, don't have! Why ACR yes? There are workarounds, yes, the simplest: open the file directly in PS. But I think about this as "a pebble in the shoe". Maybe it sounds exaggerated but I really hope that this pebble does not turn into an avalanche

Noel Carboni

Legend

If it's helpful, here's a 16 bit PNG file with accurate low luminance levels that I use for testing.

Camera Raw has no problems bringing out the dimmest stuff, run as either a filter or to open the file directly.

-Noel

CarlosGordilloAuthor

Known Participant

I would appreciate if you try with the file I attached and see this little video. ACRissue - YouTube

Thanks.

ssprengel

Inspiring

Reply 18 of this discussion thread has a diagram that shows how the very dark end of the Adobe Camera Raw contrast curve goes negative at least for some cameras and maybe that is currently the case for non-raws as well:

Re: 5DS(r) tone curve in LR and ACR : crushed shadows with all profiles

The Camera Raw filter in PS doesn't have this limitation, only the plug-in.

gary_sc

Community Expert

Got it.

Here's the image showing my ACR settings to bring out the text. Does anyone speak Spanish that can translate this? I know the first word is "Why"

Not fully sure why one has to do all of these jumping through hoops to get the text out but it is possible. I also am still very curious as to how and why this was set up to be this kind of a challenge.

Chuck Uebele

Community Expert

Gary, it looks like you used the ACR filter through PS. Did you try saving the image as a jpg, and opening directly in ACR? I got this with your settings: