Below are additional tips for creating raw HDR imagse in Lightroom CC.
• Not all adjustments that you make to individual images will carry over when selecting Photo > Photo Merge > HDR. For example, if you have made local adjustments on individual exposures using the radial filter or the adjustment brush, those adjustments will not be applied to the merged file. Because of this, I would suggest that you don’t spend a great deal of time making adjustments to each of the individual exposures but, instead, merge the images and then make adjustments to the resulting HDR image. The settings that are NOT copied over from individual exposures to the merged file are:
– The primary tone settings in the Basic panel including: Exposure, Contrast, Highlights, Shadows, Whites, and Blacks (since the merge is expanding tonal range using its own calculations).
– Tone Curve
– Local Corrections
– Red Eye
– Spot Healing
– Process Version (if set to anything other than the most recent, Lightroom will automatically update it)
• If you make adjustments to an individual exposures that can be copied over to the merged file (such as conversion to B/W or Split Toning adjustments) , make sure that the exposure with the adjustments is the “most selected” image.
• Merging HDR images requires exposure metadata. If aperture and ISO information is available, then it is used as well.
• Lightroom will show an error if you try to merge photos of different sizes, focal lengths, etc.
• Option + Shift + H (Mac) | Alt + Shift + H (Win) will run Photo Merge > HDR based on the last used Merge settings (without displaying the Merge preview window).
• The merged HDR images is 16-bit due to the significant (and painful) file size that would result if the HDR merge was 32 bit.
• By default Lightroom appends the file name with -HDR. Although you cannot change the default file naming convention, you can always rename files after they are created.
• The resulting (merged) DNG files will always default to Process Version (PV) 2012, despite any differing PV settings applied to the source images. This is because PV2012 is required for the extended Exposure range (+/- 10 stops) of 16 & 32bit files, where as PV2003 & PV2010 are restricted to (+/- 4 stops).