Tag Archives: 32 bit

HDR 32 Bit and Lightroom

This post is a plea for help. Anyone who is a regular user of Lightroom and Photoshop may be in a position to educate me a little. I use Photoshop to process my HDR shots. I start out in Lightroom, select the shots and use the Edit Photo>HDR Pro method to open them up in Photoshop. I then use the 32 bit version of the HDR Pro processor to create the file. I then take the Edit Using Adobe Camera Raw option for opening the file to undertake the final mapping. This works pretty well and I can usually get something I am happy with.

I then close the file and save it which automatically reimports the finished file back into Lightroom. This is when things go wrong. The view of the file in Lightroom doesn’t appear to make use of any of the edits I had done in ACR. The highlights are too bright and the shadows too dark. I can then use the Lightroom Develop settings to get something close to what I want but surely that should not be necessary. I might make further tweaks but shouldn’t it look the same when I close out of Photoshop.

Below is a sequence of screen captures to show you the unprocessed shot in ACR, the finished version, what it looks like in Lightroom and then what I can tweak it to. Any suggestions are gratefully received.  (Note, I didn’t make this exactly match the two edited versions.  It is aimed to illustrate the disconnect and the recovery process.)

Original HDR merge pre tone mapping


HDR with ACR tone mapping appliedwpid12808-Screenshot-4.jpg

How the saved image appears when imported to Lightroomwpid12806-Screenshot-5.jpg

Using Lightroom to get back to something like I had in Photoshopwpid12804-Screenshot-6.jpg

32 Bit HDR

wpid5294-C59F0909-Edit.jpgWhile HDR might be a topic that causes all sorts of heartache for some people (they either love it or loathe it), I find it to be a really useful tool in some situations.  I have played around with some really over the top processing in the past just for the fun of it but my main interest has been in getting an image that can cope with the wide range of lighting that sometimes shows up in images.  While I have experimented with some of the third party HDR packages, I have ultimately ended up using the HDR Pro functionality of Photoshop.

This has been working okay for me but I was always a little less than satisfied with the results.  I have understood that the HDR merging process is only the first part of the technique and then the Develop settings in Lightroom (or ACR) are required to make the whole thing work a lot more effectively.  However, the slightly flatter look along with a level of desaturation that it was hard to bring back meant I was almost there but not quite.

wpid5292-C59F0909-Edit-2.jpgA recent change that has been introduced and which it took me a while to get around to playing with was the 32 bit HDR approach.  In this, the original files are merged to create a 32 bit TIF file.  Getting to this from Lightroom required me to tweak my settings slightly. I always had the file edit settings laid out to make a PSD file.  I had to tweak them to make TIF the preferred file.  I have to remember this so that I don’t always have TIF output instead of PSD which seems to have a smaller file size.

Once you get into HDR Pro, the choice in the tab at the top covers whether you want 8 biit, 16 bit or 32 bit output.  I had previously been using 16 bit.  This includes a lot of sliders that give you options as to what you want the output to look like.  If you change to 32 bit, there is a single slider. It shows you an effect of changing the white point but I don’t think it actually changes the output file.  You decide whether any ghost removal is required as with the 16 bit file and then click to get it on its way.  Once the final file is created, I just save it and go back to Lightroom.

wpid5290-C59F0911.jpgHere, the Develop module is changed in its functionality.  You can make some pretty aggressive changes with the sliders compared to a normal RAW file.  You can work with the exposure, the shadows and highlights and the contract as well as using the Clarity and Vibrance to punch up the image.  The nice thing is that the results are a lot more natural looking.  You don’t have the really crazy styles and you don’t have the flat look that sometimes is the result with the traditional approach.

HDR is not a huge part of what I do but I am interested in having a better result.  I am not interested in investing in new software to achieve this when it is an infrequent issue for me and not usually something that a client cares about.  However, the fact I can now do a better job with the software I already have is a great step forward.  As for these three examples, the top is the new process, the middle is the old way and the bottom is using Lightroom to try and get detail from a single RAW file.