You should take a course to learn the basics of digital image processing. Also ask your publisher what they want from you.
You clearly do not know how thing work and what you said you did clearly you did not to Right
If you resize without resampling and change the resolution the will be no change in the number of Pixels or File size that just changes the Printer pixel size. The printed image size will change because of the change in pixel size.
If you resize with resample change the resolution you need to specify the interpolation method to use. The Number of Pixels will change the file size will change the Printer Pixel size will change but the pint image size will not change.
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If you are working in Fixed Layout Books, the resolution of the page is what you define it to be, however 738x985 is what Apple says their full screen, single page resolution is in iBooks.ویلا
Individual images can have up to 2million pixels (LxW). Having a bigger image, that you scale down to the max resolution is always better, if the file size of the image doesn't affect performance.دکوراسیون داخلی
1107x1478 is 1.5x the size of the single page resolution, and is 1.6 million pixels. Doing a bit of jpeg compression should yeild manageable file sizes, and look very good. I try to keep my backgrounds 400kb or less if I can.طراحی نما
Yes, Apple and Kindle apparently have different preferences, and their preferences apparently differ again between cover pictures and regular images.
It sounds like I'm OK, or at least better off than I would be if my resolution was too low. I'll give jpg compression a try. Thanks.
However, I'm still interested in hearing from people who actually work with epubs and can tell me what default resolutions they work with.