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freshsisyphus
Participant
December 23, 2014
Open for Voting

P: Support more accurate 16 bit/channel display even when zoomed out below 66.67% magnification

  • December 23, 2014
  • 返信数 54.
  • 1834 ビュー

It is rather abysmal that photoshop still has this critical bug, given that is has been reported for years now. It is a software for professional imaging yet you cannot work on an image at print resolution and have accurate color displayed on the screen.



Steps to reproduce:
-For full effect, open an image with dark shadows you would like to lighten
-Again, to dramatize, we are going to add two curve adjusment layers
--Make one curve to set your black and white points and your gray balance
--Make another curve to open up the dark shadows
-You should see that at 66.67 magnification you will get the true colors while at 50% below colors suddenly change, meaning you cannot look at the image as a whole and make color adjustments. This applies to any image that is more than 4/3 your screens total resolution, which, for a 1080p monitor that is beyond the average, would be 3MP. Yes, that is three megapixels as in DSLRs of 14 years ago.

Perhaps you could have an option to 'render proxy at this magnification' which would render a 16bit cache level at a specified magnification at which curves et al could be calculated from there on.

Shame on you for not having addressed this despite pleas from multiple professional fields for so long.

返信数 54

Inspiring
December 23, 2014
Performance and memory usage are also important - and using 8 bit upper pyramid levels improve performance and reduce memory usage.

What you describe is not a bug or mistake. It can only be changed through pretty extensive code changes and testing. Yes, that makes it a feature request.

As a bug report, this isn't going to go anywhere.
But as a feature request, it has a much better chance to make some changes.
onlandscape
Participating Frequently
December 23, 2014
The proposed solution to allow 16bit previews would be fantastic.

This is a particular problem when inverting colour negative scans too. The colours are extremely screwed when applying the massive curve adjustments needed to provide a decent inversion.
freshsisyphus
freshsisyphus作成者
Participant
December 23, 2014
Hello Chris,
Thank you for taking the time to recognise this and saying hi 🙂 I know the underlying reason for the problem, and yes, to support more accurate display while zoomed out is essentially my request, but I think to call it a 'feature request' is a bit problematic.

I say that because it is currently an implicit default without a warning as it has great consequences for the unknowing user. If anything, it should be the compromise in accuracy for performance that should be optional, given that Photoshop caters to users in professional imaging.

The performance tab could have a checkbox that reads 'Render 8bit previews below 66.67 magnification', even if it comes checked, this would be an explicit feature.

cheers,
d
Inspiring
December 23, 2014
That is because 50% you are seeing an 8 bit/channel preview instead of 16 bit/channel.

Would you like to change this to a request to support more accurate 16 bit/channel display even when zoomed out?