Odinbc wrote:
Wallace made some excellent points. The main thing to remember is 'start' your design with a 300ppi canvas.
Here's one example of why; importing the same 3048x1536 image to a 72ppi and a 300ppi canvas, both 11x8.5", landscape. If the top image had been scaled down to fit the 72ppi canvas before the canvas was changed to 300ppi, it would appear much smaller than the image currently on the bottom 300ppi canvas.
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to scaleThanks Odinbc. I tried your experiment. I opened a 3048X1536 digital photo in a 300PPI GIMP "new" screen and a 72PPI GIMP "new" screen and the results were the exact same size.
I don't think the PPI in GIMP does anything at all. Back to my original questions:
Question #1. What is the difference between a 72DPI 1800X2700 ebook cover and a 300DPI ebook cover? In my mind--nothing. They both have 4,860,000 pixels. Am I wrong?
Question #2. If I have an image in GIMP and I go to the Scale Image feature and it says 72 DPI and I change it to 300DPI, what does that do? It can't add pixels.
I scaled the same image at 1PPI and 5000PPI and it made no difference whatsoever in image quality.
Maybe the PPI (changing it to whatever) will be in the meta data (I don't know) but I don't think it has anything to do with the image quality. As far as I can tell it's all about how many pixels there are. Then it's just a question of needing to have more pixels to maintain image quality for larger prints.
Back to Wallace's post. The 72 PPI version of the lips would be just as detailed only at a smaller size.