When you placed your image in InDesign did you:
Show Import options
Crop to: Bleed?
Thank you for your response
Yes, I did. Like I said: "(tried every option in the import options when using 'Place')"
Problem with that is when I do that, the document is 305×218, while it should be 304×218... When I downscale it 1mm, then everything is not aligned to the grid anymore. First of all, the bleeding margin does not align with the grid.
Second because it's downscaling the wrong amount, it should downscale 297->296 = 99.6632997% of the original size, and then have a bleeding margin of 4 mm... not downscaling 305->304 = 99.671312%. It gets even worse when I try to align that to the 29.6mm grid. And it's not possible to enter the amount I want to scale it, because of the rounding errors. Third because I have some content outside my bleeding margin in Illustrator. If I could get all of my content inside InDesign, I could allign that to the grid, which would solve my problems I hope.
- Bounding Box (All Layers)
Why does the 1mm make such a big difference to you if you are including bleed and placing as a background? Don't downscale, just leave the extra 1mm hanging outside the bleed.
If making the book in InDesign, the grid in Illustrator becomes irrelevant as you can recreate it InDesign on a master page. If you have any other objects on the AI file that are not part of the background image, I would either import these as separate layers into InD or re-create in InD.
If I leave it as it is, either one of there are going to happen: the entire book is 1 mm off-center or the textboxes and other objects I place are out of place by almost 0 mm on the top left of the left page, to almost 1 mm on the top right of the right page. Tried that, and it looks a bit odd. When someone were to look at it, they would say there is something wrong with the layout, but not able to tell what specifcly. The displacement is subtle, but noticeable. I am a bit of an perfectionist, especially when creating a master to use through an entire book.
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I can relate to being a bit of a perfectionist, but I think I am getting confused as to what you are trying to achieve.
If the AI file is the background, and is 1mm bigger than the InD, it makes no difference to any of the content you add in InD. You could also center the background AI so it will be 0.5mm off on either side, but either way, this margin is OUTSIDE of the bleed. When it goes to print, they will likely cut your difference off. As long as you have the background centered in InD and add the content in InD over the AI file, I don't understand the issue you are having.