GX7 image resolution

wyeman wrote:

Thank you Adielle and Alcelc, that clears things up very well.

Question: If I print an image which is initially 75ppi and I change it to 300ppi in my image 2D software, how does the software decide what the additional pixels will look like?

There are no additional pixels. They will just be crammed into a smaller box. Unless you upsample in which case your image will have 16x the original number of pixels. I know only Photoshop CS4 where in image size you can tick a box called resize or something which gives a number of alternatives, 3 I think, which are called something fancy like bicubic interpolation or such. The versions are supposed to differ subtly in terms of prioritizing gradients or borders (local contrast, detail). I'm sure somebody can explain what actually happens but in any case the image won't look much more detailed, just not pixellated. With some judicial sharpening applied you might be able to make it look slightly crisper without introducing too obvious halos or other artefacts but 16MP is 16MP. My experience is that my GX7 gives me good A2 prints and haven't seen any difference between upsampling to 360ppi (optimized for the 1440dpi of my printer) in Photoshop or letting the printer take care of it. With more extreme magnification the situation might be different. I've tried to print 5MP files at A2 and imagine I got some improvement from upsampling and sharpening. They look ok from a distance but still fall apart at close scrutiny. I suggest you experiment.