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Originally Posted by BeccaPrice
I *think* I understand, but I'm not sure.
Say I have a picture that's about 3" x 3". Another is maybe 5"x 5". I want them to show up at the same size on a kindle. What dpi do I scan them at?
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It depends what you want to achieve. Imagine you set 300 dpi/ppi (dots/pixels per inch) when scanning.
The size of the 3x3 inch picture will become 900x900 pixels (3x 300 = 900).
The size of the 5x5 inch picture will become 1500x1500 pixels (5x 300 = 1500).
You can still *display* them at the same size though.
If you display the 3x3 inch picture at a size of 6x6 inch, it will be displayed at 150 dpi. (Because: 900 pixels / 6 inch = 150 pixels per inch). If you display the 5x5 inch picture at 6x6 inch, it will be displayed at 250 dpi. (Because, 1500 pixels / 6 inch = 250 pixels per inch.)
If you want them both at the same resolution, say 2000x2000 pixels, then you scan the 3x3 inch picture at 667 dpi (3x 667 = ~2000), and you scan the 5x5 picture at 400 dpi (5x 400 = 2000).
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I know how to size graphics in Word, which is what I'll do my layout in before converting to a PDF - I'm pretty sure that sizing them in Word won't change the printing dpi. But how do I size them for the kindle?
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Setting the graphics size in Word is probably impossible, because the an e-reader is reflowable and not all e-readers have the same resolution. Therefore the image won't display as you intend; you can't (and shouldn't) fix a layout for an e-reader.
You set the size using a stylesheet (in Sigil, for example), by determining how large the image has to be. If you set the image width at 100%, the Kindle will resize it (keeping the aspect ratio) to fill up as much of the screen (page) as possible. If you want it smaller, you need to set a lower percentage, and then use the CSS to determine where to display the image and if the text has to float around it or not.
It may be doable in Word and have it generate the CSS, but I do not know how to do that. I don't have Word.
My suggestion is to keep it as simple as possible, to avoid problems with displaying on different e-readers and tablets. I'd make all images full screen on their own page, if possible, or do something that's predictable, like:
"Display this image up to 50% of the width of the screen (keeping aspect ratio) in the uppler left corner."
"Display this image between two paragraphs, centered on screen, and make it 1 inch high."
If you're going to do fancy stuff like flow text, displaying images as part of the text, then it can become very difficult, as not all e-readers treat this stuff in the same way.