raid
Dad Photographer
The main difference between DNG/RAW files and JPEG files is DNG/RAW are 12-14 Bit files (16bit in the case of some digital backs) While JPEG are 8bit files. Its this greater bit depth that allows a greater latitude when processing image files.
As to how much this greater bit depth matter well that depends on how close to the perfect/ideal exposure the file coming out of the camera is.
A good way to see what difference this play is editing is to shoot DNG/RAW+JPEG then with little or any processing in LR/ACR create a 16Bit and an 8Bit TIFF or PSD file from the DNG/RAW file and an 8bit TIFF/PSD file from the JPEG file and then open all three files in Photshop.
Next do some extreme adjustments to the levels and/or curves then look at the histograms where you'll see gaps beginning to appear in the histograms of the 8bit files vs the 16bit file.
I am still relatively new to LR, and I have not saved any DNG files to TIFF files with LR before.
Thanks for the tips.