RAW files in the digital world are the equivalent to negatives in the old film world. I'm sure you know this as the "DNG" you refer to actually stands for "digital negative". Most experienced photographers will only part with good "negatives" for an ultra-premium price. I'm afraid you are facing a very steep uphill battle with this idea, unfortunately. Your ambition is honorable, however, at this early stage in the game, you may want to redirect that ambition to a modified idea based on the input you've received here. It's not to late to step back and rethink your business plan.


