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

Hello Chris Cox...

First thank you for even responding to this bug thread at all. There are perhaps many bugs that never get the attention of an Adobe employee. So thank you for having a dialog with the users on this one.

So from what I can see, we have handed you file after file of PDFs that fail in CS6 and CC. You claim this happens in CS5 too, but at different resolutions etc. In my personal experience I have never seen CS5 fail with this bug. Honestly at this point the issue is that many of the users in this thread just are not able to believe your explanation that the problem exists also in CS5. I also don't see that any other thread contributors have seen this happen in CS5 under any circumstances with any files at any resolutions etc. So *please* relive the pressure on yourself by giving us a link to just one single PDF that you have found fails this way in CS5.

Also if any forum members have seen this in CS5, please speak up and/or supply a link to your example file.

Also, I have taken all the examples I have of this and rendered them in CS6 and CC at the very highest resolution allowed by Photoshop (up to 32,000 pixels in either width or height) and it still shows the thin white lines. So rasterizing at a higher resolution *does not* solve this.

John Gettler

Sorry Cris, but i repost my comment, maybee this time its not removed, i hope you feel its not insulting again:
Im my opinion you have no intention to help us and you are not even willing to understand our problem. You just repeat the same thing over and over again. we can not wirk with this "improovement" but we could work with the older version. Now you continue telling us that also the old method was showing artifacts... OK, BUT we all had no problems with that. So please why you guys dont give us a little app just for opening the pdf's using the old renderer? Why not? You can't or you want not? PLEASE SHOW A LITTLE BIT OF CARE FOR US PRO-USERS!!!

and will this be a help for our problem we have with the ALREADY EXISTING PDF's from our clients? NO it will not!!! I think you are not willing to understand that we can not remake certain pdf's and that we can not continue our work as before. But you dont care, i know...

The old, buggy code is not coming back. To fix this, we have to change the way the PDF images are created.

The bug is in the way the images are tiled, in the application that created them. I'm still trying to figure out if that mistake is part of a PDF/x specification. It would go a lot faster if the groups responsible would actually talk about it.

And they would show artifacts in CS5 and older versions as well - just at different resolutions, and different strengths of the artifacts.

As long as the images are tiled, they can't be rendered correctly except at their original resolution or higher.

Hello Chris,

I rendered two similar PDF files in Photoshop CC. One file was generated with Illustrator CC, the other came out of Scribus. Both rendered images showed artifacts and were not rendered correctly (see images below).



But both files were rendered without Problems in Photoshop CS5. How can we explain this behavior? Is the bug located within the complete Acrobat/Distiller unit? Were can I apply to? Who is responsible? Can you give me a link or an email address?

Best regards,

Jan

No Cris; this is not right!!!
It WILL help us all, because we all could live with the artifacts from the old rasterization code. Nobody sees them and we all can continue working. So now its your turn: HELP US! DO YOUR WORK! GIVE US BACK THE POSSIBILITY TO USE THE OLD CODE!

Are you kiddiung us Cris?
Sorry, but i feel that you have ni intention to help us and you are nit even willing to understand our problem. You just repeat the same thing over and over again. we can not wirk with this "improovement" but we could with the older version. Now dont tell us again that also the old method was showing artifacts... we all had no problems with that. So please why you guys dont give us a little app just for opening the pdf's using the old renderer? Why not? You can't or you want not? is this the care you show for the pro-clients???

Please read the existing topic first. The problem is not in Photoshop, CS5 still showed artifacts (just at different points, and sometimes not as noticeable), and there's not much Photoshop can do about the bad files.

When some Adobe apps "flatten" transparancy or effects, they subdivide the image into boxes of flattened pixels. Those boxes actually do accurately butt up to one another, and therefore shouldn't have thin white slivers of white space between them. When these PDFs or EPSs are rasterized (drop file directly onto app icon) Photoshop CS5 handles them correctly and does now show slivers of white or tranpsarent lines alone the box edges. But CS6 and CC both handle this incorrectly and leave white lines.

The has to do with the Anti-Aliasing engine, since if I turn off anti-aliasing, the lines disappear in CS6 and CC but now all vector text has harsh jagged edges. But in CS5 you can leave Anti-Aliasing on, and it will give you both smooth text, and no white slivers on the box edges.

So in short Photoshop CS5 good, Photoshop CS6 and CC bad.

Here is an example file from my dropbox for you to download to test this. Drop this file onto Photoshop CS5, CS6 and CS7. Go ahead and rasterize with Anti-Aliasing on at the default size 8.5" x 10.646" at 100dpi in RGB.

https://www.dropbox.com/s/5jjr13g5qs6...