Image PPI between high and low res images

Question

I am designing a 850mmx2000mm banner composed of a heap of different photos, eventually they will all be from my 24MP DSLR camera but for the time being I have some iPhone photos in there as place holders. I'm looking at the settings of my DSLR photos and can see that the image is stretched to 178%, actual ppi is 300, effective ppi is 168 and the dimentions of the image are 5874x3921. Meanwhile the iPhone photos are re-sized to match the size of the DSLR image, but the settings are showing they are at 66.8%, actual ppi is 72, effective ppi is 108 and the dimentions of the image are 4031x3024.

Why are the high res (straight out of camera) dslr images so small in comparison to the low quality iPhone photos? I can't get my head around the fact that the much larger camera photos are being stretched, while the low quality iPhone photos are being shrunk. At the end of the day, it doesn't really matter because 168ppi is fine for my use, but for future projects this might cause a problem.

Derek Cross · Answer

It's the dimentions of your images that's important – the resolution is only important when you're printing. So an image is say 900px x 600px will display on a monitor to match the monotor's resolution. It doesn't matter if the resolution is 72PPI or 500PPI.

If you're printing it and decide you need a resolution of 300PPI (so that it can print at around 150LPI), in the example image I've menioned, it would print at 3" x 2" (900 divided by 300 and 600 divided by 300). In fact for images, such as posters, that are viewed from a distance, the resolution (the Effective resolution in InDesign speak), can be much lower, say 100PPI.

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