Scott Kelby, in one of his early photoshop books, suggested that one could blow up photos by a few percentage points at a time. I tried it with a jpeg file and it worked. For example, increasing the size by 5 percent fifteen times will approximately double the size of the image (2.08.) I don't l know if it will work for you, but it might be worth trying. You can solve the equation (1.0x)^n = y, for n, where x is the percentage increase for each iteration, y is the final size and n is the number of iterations. Roger Sent from my iPad > On Aug 22, 2014, at 8:05 PM, "James Schenken" <jds@xxxxxxxxxxxxxxx> wrote: > > Oops, I calculated at 3000 pixels on the long dimension rather than 4000. > Please make adjustments accordingly. > Sorry about that. > > CPAP Therapy is a way to live. > >> On Aug 22, 2014, at 8:44 PM, James Schenken <jds@xxxxxxxxxxxxxxx> wrote: >> >> The problem appears to be that the image magnification is about 44 times. >> The image resolution is about 83 pixels per millimeter. >> So, what you get if everything is perfect is 2 pixels per millimeter or about 50 dpi. >> That's OK if everyone is going to be 15 feet away from the image or so. >> >> Any chance the museum would go for a black and white half tone for a background? >> >> CPAP Therapy is a way to live. >> >
