You always work in RGB and make a copy from it in the unlikely event you need to supply an image in CMYK. That way you keep your flexibilty for various outputs such as using it for the web or for printing to a desktop color printer which may be CMYK + and whose software will do the conversion itself and get a wider gamut than CMYK.
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I recommend EcanCrusher (free) for opening and closing epubs, Mac and PC versions available: http://www.docdataflow.com/ecancrusher/ BBEdit (Mac only) for also editing: Bare Bones Software | BBEdit 11
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Make a copy of the file so you can experiment and learn how to do it. Look at the Layers panel (to the right of the screen), locate the layer with the yellow background and change the color from the swatches panel. By double clicking on a color in the swatch panel you can change the color.
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Indeed, but as mentioned this is the order of spacing for (metal) typesetting; and not helpful to the OP at all, but it's, hopefully, interesting to nerds like us! Justification and Spacing- The Happy Dragons' Press
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Good info, except a thin space is normally considered a fifth of an em and an em is not the width of a capital M, for example imagine a condensed face.
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You may be better start starting with a simpler task and build up your Photoshop skills before tackling more complex effects. Lynda.com have a range of online video tutorials which would help, you can get a 10-day free trial.
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Perhaps take this online video tutorial, you can get a 10-day free trial: https://www.lynda.com/InDesign-tutorials/InDesign-Insider-Training-Color-Management/410686-2.html?srchtrk=index%3a1%0alinktypeid%3a2%0aq%3aInDesign+and+color%0apage%3a1%0as%3arelevance%0asa%3atrue%0aproducttypeid%3a2
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Check out the pixel dimensions of the original stock images as they may be rather large and you may want resize them in PS before placing them in InDesign. You presumably know about "Effective resolution" in InDesign. The idea behind 300ppi is that it allows two pixels per line screen (say 150LPI), you can get away with less, say 200PPI at a pinch.
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The advantage of using native PSD files in InDesign is that you can round-trip to adjust them. By the way, I assume you know that you supply a PDF to your (commercial) printer from InDesign, probably PDF/X-4.
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InDesign CS6 is not supported under El Capitan. Some seem able to work with it and some, like yourself, have issues. It's probably worth considering upgrading to the newer version of CC2015, or maybe CC2017.
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It's not pixels per square inch, but pixels per inch. You set the image size and resolution in the Image Size dialogue box and then: File > Save (if you want to overwrite the existing file) or Save As and rename it and/or choose a format, such as JPG.
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Try exporting the document as a Fixed Layour ePub and see if it's successful or whether it throws up any issues if you validate it which may help you to discover why Publish Online isn't working for you.
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