Originally posted by anthger In the RAW information the DPI is only 72x72 is there anyway of making it better (300DPI) or this is ok ?
Marc's absolutely right that "resolution" is an oft-misunderstood topic. The only thing that really matters is the pixel *dimensions* of the file. Resolution in terms of dpi (or more correctly "ppi" or pixels per inch) only comes into play when you start discussing printing and/or viewing the image at a specific size.
Resolution in ppi is largely determined by the RAW convertor you use. In my own case of using Lightroom and ACR, I have the resolution fixed at 240 ppi because, based on my own judgement, that's the optimum resolution for a high-quality print....so by setting ACR's export preference for 240ppi, I know exactly what size print I'm able to produce at that resolution. If I want a larger print, I simply enter the dimensions I want (w/o interpolating the image) and what I get back is the final resolution in ppi at that print size...at that point I can decide if that ppi will result in a good-enough quality print for my purposes.
The reason for 72ppi generally has to do with displays....display resolution is typically 72-96ppi. As I'm looking at my EIZO CG211 which is 1600x1200 and roughly 17"x13"...and my MacBook Pro display which is 1440x900 and roughly 13"x8.25", I get about 92-94ppi and 110ppi respectively...so it would appear that 96ppi would be the more optimum "resolution" if all I were doing is displaying them on my monitor. I think the other reason for 72ppi is typography and the fact that Postscript is based on 72 "points" to the inch.
Regards,
Terry