I just can't get my head around this xmp thing. Some basic info:
I use DNG files
I back-up my Lightroom catalogue every time Lightroom exits
and under catalogue settings >metadata I have ticked:
Include develop settings in metadata inside jpeg, tiff & psd files
+ Automatically write changes into xmp
I am about to start using Photoshop
Some questions please:
1) When I exit Lightroom & back-up my catalogue, does this also write the xmp into my DNG, or must this be a separate operation
2) I've heard that auto' write changes into xmp can slow things down - is this correct for someone like myself who doesn't work with a huge number of images
3) From what I've read it seems to me that maybe when I send LR4 images to PS for further editing I should ensure that LR4 edits are written into xmp (so even if catalogue back-up writes xmp to the dng, if I've made say develop module changes during current session I'd still need to write changes to xmp before opening with PS)
The more I read about this the more confused I become. Can someone please answer these questions as simply as possible
Many thanks