robertpalmer's profile

2 Messages

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340 Points

Fri, May 11, 2012 8:49 PM

Closed

Acknowledged

Photoshop: CS6 PDF import show edge artifacts on tiled PDF images (bug in PDF creation)

When importing a PDF with images, Photoshop CS6 adds faint outlines to the PDF image segments in the file. Prior versions of Photoshop render the PDF correctly. See the attached image for an example.

4 Messages

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92 Points

10 y ago

Yes, same problem here. It seems to be importing the atomic regions between flattened transparent elements that are visible in Acrobat when screen optimisation is turned on, but are strictly as I understand it an anomaly of viewing the PDFs on-screen. It used to be the case in CS5 that they weren't rendered when imported into Photoshop, but now they are.

However, you can get avoid the white lines if you turn off anti-aliasing in the Import PDF dialog. Although, then, of course, the imported image isn't anti-aliased.

15.1K Messages

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195.8K Points

10 y ago

Yes, this appears to be a bug in the PDF/EPS rasterization engine.
Can you send me a copy of that PDF so we have a good example of the problem?

[ccox (at) adobe {dot} com]

2 Messages

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340 Points

10 y ago

Thanks Chris -- I've just emailed you that PDF.

Employee

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123 Messages

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2.7K Points

10 y ago

Hi Robert,

This is now logged in our bug database. Thanks for the clear steps in the e-mail.

2 Messages

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70 Points

10 y ago

Hello we are getting lines alot on our PDF imports into Photoshop. Which aren't even seen until after its been printed. Its causing major issues at our shop. Is there a work around??
Most of our clients send in PDFS, now its not an option, we really need to find a solution.

any advice?\thanks
Billy

15.1K Messages

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195.8K Points

The example here only happens at screen resolution. If you have examples that occur at print resolution - we need to get the files and deliver then to the PDF rasterizer team.

2 Messages

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70 Points

Yes we have many files we could send. These are for over-sized prints (33"x80" and larger). The lines show up very faintly on screen , but are very noticeable in the print. Where could i send an example?

4 Messages

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92 Points

I have an example I could send you as well Chris - is the email above: ccox (at) adobe {dot} com - OK?

15.1K Messages

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195.8K Points

Yes, that email is OK. If the file is too big for email, try yousendit or dropbox.

1 Message

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62 Points

9 y ago

Yes, this is very big problem. I hope the adobe fix this issue very soon!

Thomas.

15.1K Messages

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195.8K Points

We're not having an easy time on this one -- it has to do with the way InDesign wrote the PDF files with tiled images. Even in previous versions of Photoshop, it would have artifacts at some resolutions.

Your best solution is probably to resave the files from InDesign without the tiled images.

16 Messages

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202 Points

9 y ago

Same problem here. Already sent an email to Chris, hope it gets fixed soon. For me the problem exists with every image, not only the ones tilted

15.1K Messages

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195.8K Points

Not "tilted" but "tiled" - it has to do with how the PDF was written.

3 Messages

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82 Points

9 y ago

Hi, i get an "error" when opening a PDF (from Indesign) in Photoshop CS6 which does not appear when opening the very same file in Photoshop CS5 on the same machine. In CS6 there is a very thin white line around some objects (at the invisilble edge of the shadow maybe?). When i open the same file in CS5 this does not appear! The opening dialogue was filled in exactly the same in CS5 and CS6.

See the "error" here: http://data.360pixel.de/PSCS6/PSCS5-v...

How can we avoid this error or is it a bug in CS6?

Thank you!

This reply was created from a merged topic originally titled
Thin line when opening a PDF in CS6 - not in CS5 - a bug?.

3 Messages

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80 Points

9 y ago

Are there any changes or fixes yet?
We already downgraded our Photoshop because we need that import on a daily base ... :(

15.1K Messages

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195.8K Points

No, changes -- InDesign won't tell us why they export the tiled files, but we've determined that it is not directly a problem with Photoshop itself (or the PDF rasterizer) but a problem with how the images were written.

4 Messages

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92 Points

Chris, it's not just PDFs from Indesign, it's those from Illustrator as well - the one I sent before was from Illustrator, via Acrobat Distiller (ie. print to PDF). Not sure if that's any help.

2 Messages

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70 Points

Also from Quark Xpress 4.4 pdf files from there imported into photoshop cs6 also

2 Messages

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70 Points

9 y ago

After a lot of searches, I've found the answer. It's working for my pdf files.
You need to uncheck the square "smooth" (I don't know if in english its is this word, but just under the name of the pdf) in the dialog box.

16 Messages

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202 Points

9 y ago

@matt This has been noticed before, but this is only a incomplete workaround because if there are vectors in the document they will have very jagged edges. The only workaround is currently using an older Photoshop-Version, because it has nothing to do with Indesign, its just the Import Dialog in Photoshop thats bugged.

Another option is to save the PDF as JPG from within Adobe Reader, this is yet the best workaround because it will get rid of the lines and smooth the edges.

If you need more control upon import you can open it in illustrator and save it as an eps, then import it to photoshop - the white lines will be gone.

Please Adobe recognize this error and fix it! Its just a bug in the PDF-Import Dialog, it has NOTHING to do with the PDF File your trying to import.

15.1K Messages

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195.8K Points

We have recognized the problem, and spent considerable time working on it.
And it has everything to do with the tiling of images in the PDF.

Older versions of Photoshop rasterized PDFs differently, which would hide the artifacts at some resolutions, but still show them at other resolutions. It just wasn't as common to see the artifacts because the older rasterization code did not have as high a quality as the rasterization in CS6.

Disabling anti-aliasing may hide the artifacts at some resolutions, but not others.

Short version: tiled images in PDFs can only be rasterized correctly at their original resolution, or higher resolutions. If you try to rasterize them at lower resolutions, you will get artifacts on the tile boundaries.

16 Messages

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202 Points

9 y ago

@Chris I'm unable to replicate this behaviour in older versions.

The artifacts also appear at every resolution, below, equal or above the original resolution. The resolution doesnt matter, the artifact is always 1 Pixel around the borders, see attached screenshot:

This is the same file as above, only color fill as layer style applied to its easier to see, what I noticed when I did this is that its not a white line - its transparent!

15.1K Messages

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195.8K Points

I have more documentation about the problem -- I can replicate it in older versions.

Again, we've spent quite a bit of time figuring this out (at least from the Photoshop side).

And it is a problem with the tiled images -- they cannot be rasterized correctly except at their original resolution or higher resolution (and even then some rasterizers might show artifacts).

2 Messages

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70 Points

9 y ago

Ok Chris I understand the problem but this is a big issue for us.
Do you think you'll fix it shortly or not? I'm a printer and we upgrade to the CS6 but this is very annoying for us, we can see it after printing.

15.1K Messages

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195.8K Points

I don't know when it will be addressed. But we understand that it is a problem, and are trying to get the responsible teams to make a fix.

1 Message

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52 Points

9 y ago

this is very frustrating. how far away is the fix for this?
luckily I hadn't deleted CS5 just yet!
hmmm, not real happy Adobe!

16 Messages

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202 Points

9 y ago

6 months and still no fix, not even a notice about something being done ...

15.1K Messages

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195.8K Points

We still haven't gotten answers from the InDesign/PDF teams about why they're writing PDFs this way (that cannot be rasterized correctly except at high resolution).

16 Messages

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202 Points

Even if I start to repeat myself: Its not depended on the way InDesign writes PDFs. The same PDF made in CS 6 rasterizes correctly in CS 3, a PDF created by Indesign CS 3 rasterizes wrong in Photoshop CS 6.

All Programs that write PDF-X3 compatible PDFs show this error in CS6, but not in CS3

15.1K Messages

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195.8K Points

And I'll have to repeat myself: yes, it is dependent on the way the PDF is written. Older versions of Photoshop used a different rasterization scheme that minimized the artifacts, but gave much worse quality and ran slower.

The problem is that the PDF has images tiled in a way that they cannot be rasterized correctly except at resolutions higher than the original image resolution.

This is not a bug in Photoshop CS6, just a change in the antialiasing code that makes the problem in the PDF much more apparent.

16 Messages

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202 Points

Then its the easiest fix to implement: Give me the option to choose which rasterizer is used on import. A simple drop down where you can select CS6 or CS3. Then everyone is happy. Just put it in the next update cycle and ill be happy.

Because right now its not better or faster or anything of that but simply broken! It is currently impossible to rasterize PDFs correctly.

15.1K Messages

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195.8K Points

The artifacts could also show in CS5 and earlier, just not as often.

This is something we need to get fixed at the source of the bad PDF files.

Photoshop itself is not broken. This is a problem with the files and the way they were created.