The software allows you to catalog and sort the photos, place them on a map if you included their GPS positioning, print, make albums, slideshows, etc ... This section has changed little compared previous versions.
By cons, most of this version compared to previous LR4 is the development engine that is simply phenomenal !!!! The old fill light sliders, black, white, etc ... have been simplified and improved.
When working with RAW files, not JPEG, he is able to catch all kinds of serious problems taken from the overexposed part to the party that comes out completely black. The noise processing engine has also been improved and is well worth that of DXO8. LR4 also copes with the default jpeg, although his corrections capabilities are diminished compared to RAW.
I had old photos stored in RAW I thought irretrievable, LR4 has allowed me to draw something very correct. It is an essential complement for amateurs and professionals photographers, because it helps get the most digital cameras.
Change from 16/04/2013. Version 5 is available in beta version for release planned for summer 2013. If development tools will remain identical between versions 4 and 5, this new version will have a correction brush that will not always spherical where increased facility for touch-ups. Version 5 will also be a powerful tool for correcting distortions related to perspective.