Image size for ibooks author

Hi
I am making a book using iBooks author. It will be image heavy. (40-50 images)
I have a few question on images.
1. I do not want the file to be huge or take an age to download so an Apple rep informed me that the images should ideally be no more than 500-600kb per image saved at 72dpi
Forgve my ignorance but can someone eplain to me what this means in terms of pixels? What size (height and width) and resolution (pixels per inch) should I save images so that they can be seen at their best but not be overly large?
The finder window when I try to resize images gives me some standard options. Should I take these? Also if I click on 1024 x 768 pixels as a standard size, the width and height boxes do not change.
I'm a little confused.
Many thanks

This thread is over 12 months old now...perhaps you posted here by mistake. Your problems have slready had rep,ies in another thread, however to answer your question..
No, iBA does not seem to change image size....which is why you see posts about tickets for images size in books held back by the review team.
Consider that Apple gave you free use of iBA. Pages, inDesign and others come at a cost.
If you intend to create other books with a high photo image content, you really need to consider investing in suitable software.
I suggest you search the net for "photo image editors" or similar, dont wait for iBA updates..I doubt Apple will address image sizing and "cropping" can effectively be done using the image mask.
As in all projects be it eBooks, making kitchen tables or building a tree house...its sensible to gather all your assets and ensure they are suitable for the planned use....before starting the construction process.

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Image size for ibooks author

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