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Edit HDR DNG as 32 bits/component in Photoshop

Community Beginner ,
Mar 08, 2017 Mar 08, 2017

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I compose HDR DNGs using Lightroom CCs built-in HDR merger with a typical dynamic range of ~22 f/stops.

How can I edit/export the HDR in 32-Bit in Photoshop? All options I found would reduce the bit depth to 16 bits/component. Even when I open the 32-Bit half float HDR DNG created by Lightroom in Adobe Camera RAW i cannot find a way to move forward with 32 bits/component. Is there any workaround for this?

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LEGEND ,
Mar 08, 2017 Mar 08, 2017

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Here's an update from Adobe on the bug:

The Lightroom team is actively investigating and working on fixing this intermittent issue of UI panels becoming Black, and we are close to finding a solution for it, however, it is not yet in the most current update (6.9/CC2015.9). We are hoping to have it fixed in next update.

For workaround information please see this document: https://helpx.adobe.com/lightroom/kb/lightroom-panels-black-issue.html

Thank you for your patience.

If you add your me-too vote to the bug report in the official Adobe feedback forum and follow that topic, you'll get notified whenever the status changes.  (This forum is primarily a user-to-user forum.)

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LEGEND ,
Mar 08, 2017 Mar 08, 2017

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Hmm, the forum software posted my reply in the wrong thread!

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LEGEND ,
Mar 08, 2017 Mar 08, 2017

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After you have opened the HDR image in Photoshop you can go to the Image->Mode menu option and choose 32-bit. However, you will discover that you have a very limited choice of tools to use in that mode. It's probably best to do as much of your editing in Camera Raw before opening the image in Photoshop..

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LEGEND ,
Mar 08, 2017 Mar 08, 2017

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lgs-blad  wrote

I compose HDR DNGs using Lightroom CCs built-in HDR merger with a typical dynamic range of ~22 f/stops.

How can I edit/export the HDR in 32-Bit in Photoshop? All options I found would reduce the bit depth to 16 bits/component. Even when I open the 32-Bit half float HDR DNG created by Lightroom in Adobe Camera RAW i cannot find a way to move forward with 32 bits/component. Is there any workaround for this?

This not an issue as explained at these two posts:

Adobe DNG HDR Format, Part 1 | Pro Photographer Tech (ProTogTech)

Re: Are the HDR files created by Photo Merge in Lightroom CC/6 32-bit or 16-bit?

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Community Beginner ,
Mar 08, 2017 Mar 08, 2017

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JimHess​

If I switch in Photoshop from 16-Bit to 32-Bit the HDR details are already lost from the 16-Bit import process and I cannot recover them just switching to a different mode.

trshaner​

I understood that the DNG half float format is used to store the HDR data in a compressed form which still delivers ~30 f/stops but less color precision. But when I do edit/export process asked in the original thread, it uses true 16-Bit (not 32-Bit half float), which means 16 f/stops.

Anyone has an idea how to get the full ~30 f/stops into Photoshop?

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LEGEND ,
Mar 09, 2017 Mar 09, 2017

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The DNG 16 bit Float format file can only be edited in LR or ACR with no capability to export as a 32 bit HDR file. If you need to edit the file in PS you have two options:

1) Apply your LR Develop module edits to the HDR DNG file and then use Edit in PS to open it as a 16 bit TIFF in PS.

2) Use LR Edit In> Merge to HDR PRO in Photoshop to create a 32 bit HDR TIFF.

What type of editing are do you need to apply to the LR HDR DNG file in PS?

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