location of a png file

[Hosun]

Hi,

While uploading an EPUB file to Apple Books, I encountered an error message below.

I should reduce the dimension of the file.

But I can't fine out 1165.png.

It is not in the LINKS panel.

Would you help me find out the location of 1165.png?

Housn Kang

[Derek Cross]

Your ePub seems to consist of what would be raster images - If so, it would make it a very large file (apart from other possible issues).

What does it state when you validate the file?

[Hosun]

Hi,

Thank you very much for your reply.

Would you explaine what "validate the file" is?

Hosun Kang

[Derek Cross]

Consider taking a LinkedIn Learning online video tutorial on the correct way to create ePubs (you can get 39-days free access): 

https://www.linkedin.com/learning/indesign-cc-2018-epub?trk=share_ios_course_learning

[Derek Cross]

There are two kinds of ePub – FXL ePubs (used for publications like illustrated children's books and cookery books) and Reflowable ePubs (used for text-heavy publications, such as novels and biographies).

Validating an ePub is a means of checking the validity of the ePub and indicating possible issues.

Here's a free one: http://validator.idpf.org

And this is a paid-for one, which gives much more information: https://ebookflightdeck.com

[rob day · Accepted solution]

I can see from your Links panel you have some image files that are full page. When you export to EPUB the image resolution you choose is likely exceeding Apple’s 4,000,000 pixel size limit. For example if your page size is 8"x10", choosing 300ppi would exceed the limit 2400 x 3000=7,200,000. Try setting your conversion Settings>Resolution to 150ppi or less.

[Hosun]

Hi,

Thank you very much for your analysis.

I might be able to get some clue.

So far, I reduced the dimensions of 6 files, because of the errors about 4M px limit.

They are what you saw at the top in my LINKS panel.

Each file is of full page.

page 208page 215page 216page 217page 238page 239

Q1. Do you mean?; even though those 6 files are less than 4M px for each, they cause the problem, when it is exported to EPUB with 300 ppi.

As you sensed, my book is of letter size (8.5"*11.0") and fixed layout.

I exported to EPUB with 300ppi.

Q2. If I reduce the resolution from 300 ppi to 150 ppi, isn't there any issue to the quality of the final outcome?

Hosun Kang

[rob day]

Even if you reduce the pixel dimensions of the placed pngs, a 300ppi version will be included in the ePub package, so I think you’ll have to export using 150ppi in order to get Apple’s acceptance.

[Derek Cross]

You should also bear in mind that the Apple iBooks reader, though a good ereader,  can only be used on an Apple computer or device such as an iPad or iPhone. 

[Derek Cross]

Why did you choose FXL ePub for the format for this publication? From what I can see, it looks as if it should be a Reflowable ePub.

[Hosun]

In December last year, I was trying to publish my book on Kindle Direct Publishing.

But EPUB was not opened at all in Amazon system.

Fortunately, I found out it was opened with the Books app on my iPhone.

To publish on Apple Books, I bought MacBook Pro in late January and I am here.

My book is about the economy.

There are many graphs and figures, which should be placed with the text correctly.

So, I chose fixed layout.

Hosun Kang

[rob day]

Both fixed and reflowable require a Resolution choice. I think your .AI files are also going to get rasterized on export, so there’s no way around the Apple limit for graphic rich layouts.

[Hosun]

Originally, those 6 files;

page 208: .ai file

pages 215-217: .pdf file

pages 238-239: .png file

Now, I can roughly sense what's going on inside.

Hosun Kang

[Derek Cross]

What you've produced is a complete mish-mash. IMO you need to go back to square one and learn how to produce a properly formated Reflowlable ePub (which can then be converted to a mobi format for the Amazon Kindle. Your book having so many rasterised images means it will probably cost a lot for the size of file.

(You anchor your images to the text with a Reflwowable ePub, so that's how you keep the those elements together)

[Laubender]

Hi Hosun,

let me throw in another idea:
Is there a chance that you can convert the graphics to SVG files and place the SVGs?

Then InDesign should be able to retain the graphics as vector graphics even when exporting to fixed layout EPUB.

This is a new feature with InDesign 2020.

Read about it here:

https://helpx.adobe.com/indesign/using/import-svg-files.html

Regards,
Uwe Laubender

( ACP )

[rob day]

Hi Uwe, Have you tried exporting a document with placed .SVGs to epub? I just checked using .SVG instead of .PDF and the .SVG still gets rasterized. I don‘t do much epub work so maybe I missing something?

[Laubender]

Not yet. But there must be some options where you can shield the SVG from rasterizing.

I guess, that's not an auto process. You have to look into the object export options as well.

( No time to try this right now. )

Regards,
Uwe Laubender

( ACP )

[Laubender]

And to answer your initial question:

Would you help me find out the location of 1165.png?

You already discovered that there is no 1165.png placed in your InDesign document.

Why then does the exported EPUB contain a 1165.png?

Because InDesign wrote that file on the fly during export into the EPUB file.

Regards,
Uwe Laubender

( ACP )

[Hosun]

Firstly, it was 1172.png.

Then, it became 1173.png.

Now, it's 1165.png.

What does it mean?

Hosun Kang

[rob day]

You can open an .epub package by changing the .epub extension to .zip and using a zip compression utility to uncompress the zip archive. Here I’ve used Stuffit Expander to open Reflowable.zip.

The ID file has an image file, a cropped .PDF and a full page .PDF

The assets are stored in the OEBPS>image folder. I exported using 300ppi as the resolution and you can see the full page .PDF got converted into a 2550 x 3300 pixel .png. Uwe is right, the only way to avoid rasterizing vector art would be placing .SVG files. You sould be able to open your .AI files and save them as .SVG.

[Hosun]

When I encountered an error message, I exported .ai file into a transparent png.

Image resolution was not good with jpg and non-transparent png.

I will try it.

Hosun Kang

[Hosun]

Hi,

In your first reply, there is 2,400*3,000=7,200,000.

Could you explain what it meams?

Hosun Kang

[Test Screen Name]

The arithmetic seems correct. Which part of it is puzzling? Where the two numbers come from that are multiplied? Why you multiply? Or what you do with the answer?  You certainly don’t seem to like our view that full page graphics is a really unsuitable way to make an ebook, is that connected to the math?

[Hosun]

Hi,

Thank you very much for your reply.

I just want to know the logic behine those numbers.

Regarding the full-page graphics, I had no other option, because they have been taken from my other writings and I should keep the original versions intact.

Hosun Kang

(You, like Derek_Cross, are overeacting to my question.

I've never seen it before in Adobe Community.

Derek_Cross was leading me to the wrong direction wihtout considering my intention.

Adobe Community is the place where experience is shared with each other.

It's not a place for the psychological warfare.)

[rob day · Accepted solution]

 It’s the pixel dimensions of an 8”x10” page output at 300ppi—(8x300)x(10x300)=7,200,000.

An 8.5 x 11 page would be 2550x3300. Apple is limiting the total number of pixels in an image to 4,000,000, so you multiply the width x height to get total pixels.