InDesign ePUB fails itunes Producer (Image size error)

Question

Hi,I've exported my ID CC 2019 file to an ePub and it appears great.However, when submitting it to the iBooks store via iTunes Producer it fails due to an included image being over 4M in size. The stated image that failed was called "11.png" ….and had no correlation to any image name that I used within the ID doc.I then went through all images checking their pixel sizes and actual byte sizes. None of them are over 4M??After some investigation on the internet, I renamed the .epub file to a .zip, and extracted the content via Stuffit expander, and sure enough in the image folder there was a file called "11.png". After opening this file with photoshop it is a blank transparent image of 13M!!??The problem I have is how do I locate the offending item/image in ID, that is inducing the creation of this spurious large transparent file??Any help greatly received.Regards,           Iain.....

Albert Stickrust · Answer

Hi there,

I *just* went through the same problem this weekend. It is crazy making! But I did figure it out.

This is what I figured out and how I fixed it.

The export process from InDesign to ePub seems to take the information you have assigned to be the cover and it creates a new .jpg/png for it. This file does NOT appear in the InDesign file. You can find it by "cracking open" the ePub file. Which it sounds like you did by converting it to a .zip.

For the life of me I could not figure out why ID is exporting the image so large. Nothing I would do change the export size. It might be a bug.

I was able to fix this problem by using the software eCanCrusher. It "opens" and "closes" ePub files to allow you to see the contents. (The ePub output is really a HTML file with attached images.)

I opened the exported file with eCanCrusher.

I found the problem image.

I opened the image with Photoshop, resized it, and saved it with the exact same name.

I closed the folder with eCanCrusher.

That solved it for me.

https://www.docdataflow.com/ecancrusher/

Hope that works!

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