PDF files exported from InDesign are typically perfectly fine to directly print. Unfortunately, many print service providers have various third-party programs that try to “inspect and fix” PDF files. I can assure that this is not Adobe software doing this. We've heard of this symptom of overprint OPM=1 being switched to OPM=0. The only reason not to use JPEG2000 compression is that some non-Adobe PDF viewers croak on JPEG2000-compressed images. JPEG2000 lossless compression will typically give you better compression than ZIP compression, but JPEG2000 compression is not available with PDF/X-1a or PDF/X-3 (neither of which you want to use anyway). PDF/X-4 files are typically smaller than PDF/X-1a files of comparable content due to transparency flattening bloating the file size. PDF/X-4 files are a bit bigger than the equivalent PDF 1.6 file without PDF/X-4 due to inclusion of a CMYK output intent ICC profile. Not checking the Crop image data to frames buys you absolutely nothing other than a bloated PDF file unless you are using a particular image many places within the same PDF file with different croppings - highly unusual though. (Many old-timers shutter at the concept of “lossy compression,” which JPEG provides, but most often can't tell the difference between a ZIP-compressed and a JPEG maximum quality-compressed photographic image!) Unless you are printing exceptionally critical material, we strongly recommend using Automatic (JPEG) which provides an excellent balance between compression and quality. With the Automatic (JPEG) setting, each image is analyzed and based on its characteristics, either ZIP or JPEG compression is used. In terms of ZIP versus the Automatic (JPEG) / maximum quality image compression, Adobe's PDF creation differentiates between images that are “vector-like” in content versus those that are photographic. ![]() ![]() Bad, contrary to what many Luddite and poorly informed print service providers / printers will tell you (unfortunately, many of them “learned” their trade from their elders but never bothered to update their skills based on the major technological advancements of the last decade! ![]() This ties your PDF file to a particular device and resolution. PDF/X-1a is not color-managed and transparency is flattened in the process of creating PDF. Every RIP/DFE using Adobe (or even Global Graphics Harlequin) technology released over the last eight years or more will yield much better results with PDF/X-4 than PDF/X-1a.
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