I have a problem when I make an EPUB Export from InDesign CC2015 (Windows 7). I have edited my JPEG-images in Photoshop. But when I chose "Use Existing Image for Graphic Objects" the settings are ignored and the images shrink to different sizes. I have tried dfferent cmobinations with or without "Object Export Options". The resultat is the same.
I have done about 30 EPUB Exports since ID 5.5. most of them with images but this problem seams to accured with later versionns of ID.
Moved to InDesign EPUB forum
My problem is solved! I discovered that the images were in grayscale mode and InDesign converts them to RGB when I exported them to EPUB. Thats the reason why InDesign could not use the existing image. After convertering the images to RGB (with Irfanview) all worked fine:-)