Hi Robert ..... The workflow (I've been doing it this way for almost 20 years) for this bi-monthly magazine is as follows. I design a 20 page section of the magazine while another designer creates the balance of the pages (usually 76 additional pages). When he is finished he sends me a "packaged" folder. I then add my pages to his pages - making a complete magazine. At this time I put in the ads / check colour consistancy & add page folio etc. Now, more often than not, entire sections have to be re-located ..... something that may have contributed to the "appearing" image. The image that seemingly "appeared" at the last minute actually migrated from the previous right-hand page when a section was re-located. I believe this may have been caused by the image box being too wide & bleeding too far off the page (see blue box in screenshot) Your thoughts please Robert 🙂
I'm not certain of this, but I suspect the reason it appeared on the final PDF but not before was you were not looking at imposed spreads. I suspect the imposed magazine uses at least an eight-up folded imposition, and that by not cropping the image to the bleed, and also not checking the crop image data to frame box in the export settings (it's not checked by default) you contributed to the problem, but ultimately the error is at the printer since the impostion should have cropped the data to the page edge. If you haven't done it already, I would have a discussion with the printer.
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