New answers tagged compression
I think your problem here isn't as much on your end as Facebook's. Imagine 500,000,000 users, all with Hi-res banners and profile pics... there's a SERIOUS amount of compression/degradation that they apply unfortunately. There's ways you can minimize it, by starting with Hi-Q stuff out the gate, but the artifacts are somewhat unavoidable.
In AI, go to File > Save As and select PDF from the document type. When the options for the PDF appear, go to the Compression section and in the following boxes, change all of the downsamplings to "Do Not Downsample" and compressions to "None" Print your PDF
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