P: PDF import show edge artifacts on tiled PDF images (bug in PDF creation)

Sorry, I meant why CANT I export to TIF from Indesign...

Chris, thank you for the explanation, I must have overlooked it. From my experience in version prior to CS6 it worked always fine. But anyway.

The problem became now with CC2015 even worser as the old work-around to rastersize the PDF in 2400dpi and than downsampling it to 300dpi does not work anymore. The anti-aliasing has been changed once again.

Thanks to mediengestalter.info I found the solution: One has to generate PDF/X4, and those PDFs containing transparencies can be rendered to an image by photoshop without problems.
If you only have the PDF X3-file, one has to export it to TIFF/JPEG directly from Acrobat.

What I still do not understand is, when these fine white lines are inside the PDF/x3, why do I see it e.g. in Photoshop CS6 and later, but not when producing offset-prints from such a PDF file?

When I export a JPEG from Acrobat there are no white lines as well. Does that mean Acrobat and Photoshop are using different antialiasing engines?

Wouldnt it be clever to add a function to Photoshop to let the user decide which kind of antialiasing he wants to being used when rendering a PDF/x3 or earlier to an image?

And last but not least, why can I export a TIF file directly from Indesign CC2015? Or does that feature has been moved to somewhere else?

Many thanks!

That was already addresses earlier in this topic.

It didn't "work fine" - the lower quality antialiasing in older versions just hid the lines more often, but you could still see lines at different resolutions. With improved antialiasing quality, the lines just become visible more often.

Chris, and why did that work fine in Photoshop prior to CS6?!?

This is a great conversation that's not related to the one you just posted in, so I created a new conversation to continue the discussion.

Please reference the new conversation here: Illustrator art rasterizes with odd edges in Photoshop

I also recorded some tests:

Hello I have similar issue here, after creating layout in Illustrator CS6 I wanted to export it to the PSD file, but whenever i open .ai or .pdf file in Photoshop CS6 every image in it has some weird jagged edges.

I tested importing .ai to Photoshop - resulting in jagged edges on transparent images, no matter what type of image is it (tiff or psd)

That's really annoying. I Think that it is a bug in Photoshop or Illustrator.

After exporting .ai to TIFF transparent images are OK.

That can still get artifacts at some sizes/resolutions.

Again, as already explained several times in this topic: the problem is in the way the PDF files are created, and because they have images in tiles, they cannot always be rasterized without artifacts.

As a workaround, rasterize the PDF at 4 times the desired resolution with anti-aliasing turned off (eg 1200ppi), and downsample afterwards to the desired resolution (eg 300ppi).

Perhaps not the most efficient anti-aliasing method, but it does the job without artefacts.

Photoshop CS6 introduced issues with the rasterization of PDFs. Trace lines show up all over our images. They are not there when viewing the pdf in Reader. Some suggestions on the net have been to make sure you are rasterizing to the original resolution, but this still doesn't actually help.

I installed CC today to see if it has been fixed in the newer version of Photoshop, but still no progress. I have attached images that show the issue. Compare the pdf in acrobat reader to the one in Photoshop. I have zoomed them up to make the problem more obvious.

Is there a work around or a way to report the bug to Adobe? The bug reporter sent me here for Photoshop.

Also it would be nice if the pdf open dialog was automatable, but it is still very clunky.

Anyway, no reason I can convince the bosses to upgrade yet Adobe. I hoped that Acrobat Pro would offer one with the search and replace feature, but all it did was crash over and over. So far very unimpressed with the progress Adobe has made in 3 years.