That’s very easy. First of all you have to go to Lightroom Library. Then you have to select photo, which you want to convert. After that go to Library menu and click Convert photo(s) to DNG

This will lead you to following dialog window:

Lets examine options in this window:

• First option is Only convert Raw files. Leave this checked if you want to convert only raw files, and uncheck it if you want to convert your jpegs and TIFFs too.
• Next option is Delete originals after successful conversion. Checking this option will delete your original raw files after conversion. You may want to leave this unchecked to delete these files manually later.
• Next option is File extension. Here you can only select if you want uppercase .DNG or lowercase .dng filename extension. I usually leave default lowercase .dng extension.
• Then goes JPEG Preview. You can select none, Medium Size, and Full Size options. All these options have effect upon resulting file size, and preview availability, and I recommend default Medium Size option too.
• The next option is Image Conversion Method. The options are Preserve Raw Image and Convert to Linear Image. Again I recommend to select default option and leave image in original “mosaic” format, because conversion to linear image is not reversible operation, and is recommended in very rare cases.
• Next you can select whether to use lossless compression or not, and I don’t see any reasons not to use it, because you will gain in file size and won’t loose ant quality.
• The last option is used to include original Raw file in resulting image. In some cases you have to include original raw file for legal or other reasons.

After you press OK button conversion process will get started, and after that process finishes all your processing setting will be transferred to your new DNG files, so all your hard work will be preserved.

Assuming that not every photo you take is a keeper (well, may be it is just me who takes bad photos sometimes) you’ll inevitably need to delete photos.

There’s two ways in Lightroom:

1. Deleting from your catalog but leaving them on your computer.
2. Removing them from your computer all together.

First of all, if you are browsing your photos using keyword tags, you have to “Go to Folder in Library”:

To do it just right-click you photo and then click “Go to Folder in Library“.

Then, when you are in Folder you can right-click you photo again and then choose “Delete photo…”

There you will have two options:

Press Remove button to remove photos from your Lightroom Library, or Delete from Disk to move them to Recycle Bin.

The other option is to use keyboard shortcuts:

• To delete them from only your catalog but leave them on your computer just press Alt-Backspace (Mac: Option-Delete).
• If you want to delete them from your computer too just press the Delete key and then press the Delete from Disk button. That moves them to Recycle Bin.

First and most obvious way is to set it using mouse when you are looking at your images Library Loupe view. Just click on the star and you will set corresponding rating to the image.

The other way is by using keyboard shortcuts. Select your image or look at it in Loupe view, then use 1 to 5 keys to set Rating 1 to 5 stars accordingly. After selecting use your arrow keys to move to previous/next image.

Or you can use Shift-1 – Shift 5 to set image rating 1 to 5 stars and move to next image automatically.

There is even better, undocumented way to do it. Turn your Caps Lock on and press 1 to 5 keys. You will set rating and move to next image like if you did this with Shift-1 – Shift-5.

Also you can use same key combinations for setting color labels for images using numbers 6 for red, 7 for yellow, 8 for green, 9 for blue, and 0 for purple.

Summing everything up we have following table: