I've put this question pretty far down into the body of another thread on another part of this forum with no responses, and it occurs to me that it might be more appropriately answered here.
I know that some glossy mags still don't accept digital images, and one POTN member who said he was in the glossy mag publishing business but was not a shooter or a photo editor said the magazines in the company don't accept digital images from cameras with less than 12 Mp. Specifically, because a photo taking up two pages requires more than smaller-sensor cameras can put out.
So, here's the deal. I shoot the 20D. You all know that's an 8.2 Mp camera. I shoot RAW almost exclusively. I can open an 8.2 Mp RAW image in Photoshop to just over 13x20 at 300dpi, and 300dpi is the glossy mag standard. A double-page image in a standard glossy mag would measure 11x17, so there's even room for a bit of cropping.
I know Photoshop is doing its own interpolating to get to that size, but I'm able to make tack sharp prints of those 300dpi 13x20 images. And I'm not talking about major massaging of the image, either (in fact, I've made very sharp images off the 20D and the 6.3 Mp digital Rebel to 20x30 inches by asking Photoshop to interpolate further, and I know I can, and will, go bigger with the 20D.)
So if I can do it, why can't photo editors? Someone help me out here.

