Generic DNG format question
I was experimenting with Lr5 beta this morning, trying out some of the new features. I noticed that when I did an “edit-in Adobe Photoshop CS5.1…”, the photo opened in Photoshop with a part of the image I had removed in Lr5 – still in the image. The “edit-in” was looking for ACR 8.1, and, of course, it wasn’t there.
It got me wondering about the DNG format (that I convert to all the time). Question: If I took a DNG file “developed” in say Lr5 over to another (non-Adobe) raw processor that handled the DNG format, would that processor just open the image as it would have appeared just out of the camera, ignoring the Lr “develop” instructions – or what?
In answer to your first paragraph, LR needs to perform the rendering. When you perform an edit in PS, LR will render all your develop settings into a new TIF or PSD file that is read by PS. Do your adjustments in PS and then save. The TIF or PSD file will then be returned to LR. Your original raw file remains intact and unchanged, along with all your develop settings.
The DNG format is an Adobe proprietary file format but it's format is open to all. Personally, I've never bothered to convert to DNG (unless the camera is so new that I've had to use the Adobe DNG Converter), preferring instead to retain the original raw files.