I can't imagine anyone telling you that the creation of epub can be done with no HTML skills. Without HTML and CSS knowledge you will struggle mightily in creating a good epub.
That said the feature you are referring to will happen with any image in any epub on iBooks.
Thanks for taking the time to reply.
I have seen many books in iBooks where if you tap the image the text will disappear but the image remains the same small size. Very few I've seen have the feature where the picture will actually expand, which indicates its not universal. So I was just wondering if there is a different way to insert the image so it does expand? ie, do you include 2 images 1 large and small, or simply have 1 image but allow it to show at full size when tapped?
It's actually a great idea because you can fit both text and an image on a page so it looks tidy, and then the picture can be expanded when the reader wants a bit of detail.
I have put previously put a good but basic Kindle book using Word and Mobipocket without html. Which was mostly painless!
AFAIK, It will only expand if you include an image large enough in the file.
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I believe that there is a new setting available from InDesign CS5.5 which should ensure your pictures will expand. Either globally in the EPUB export dialog (or individually, using Object > Object Export Options), you can choose whether your images are Fixed size, or Relative to Page. Choosing Relative to the Page allows them to enlarge to the width of the reader's pixel dimensions.
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Size your image so that the longest dimension is 1024 pixels.
Screen size of iPad is 1024 x 768.
In iBooks, when a user double-taps on an image, iBooks will open the image in full-screen view and scales the image to its largest dimension.
In normal book view, iBooks displays all images at their maximum size unless they're larger than the iBooks page, in which case they are displayed to the max width or height of the page (until double-tapped on).
You can constrain the image size in iBooks with certain HTML coding. (Unlike other epub display software and devices, iBooks ignores CSS height and width instructions unless you make specific use of a <div> tag.)
More info here:
Steve and David thanks for your answers. I'm still in the process of preparing several images before I put them into my epub via inDesign. The iPad screen size is 768x1024. I have some images which are 990 x1265. If i put them into my epub, and they are double tapped, will they be resized so they fill the screen exactly or will they be oversized?
They will resize to fit the screen.
If the image is larger than the screen size, users can use the pinch gesture to zoom in on your image further.
If your images do not contain detail that users would likely want to zoom in on further, you might consider reducing the size of the image and thus the file size of your ePub.