Knocked out boxes when viewing PDF files

[andy_Haynes@adobeforums.com]

Using a drop shadow over a spot color gradient creates white lines and boxes.

[Jon Bessant]

turn ON the overprint preview and turn OFF the smooth line art option in
your Preferences/Page Display area ...

Jon

[andy_Haynes@adobeforums.com]

This we will try and it might be helpful, however, our client may not even know what that means. I know, because I know Acrobat. They may be using an older, PC, version of Reader as well. We need a solution that allows them to open and view - no issues - even if it means converting everything into jpegs.

Also, we have a similar issue, this may belong in the Indesign forum, about printing the same job that when printed, these lines and knocked out boxes appear.

A

[Jon Bessant]

In that case you will need to proof a live transparency PDF which does
not contain any overprinting objects and ensure that further upstream
the print provider can handle live transparency or can guarantee (smile)
they flatten without degrading/changing content ...

Using the new preflight within Acrobat 8 is great for two main reasons:
1) improved preflight in general with some great fixes
2) a UI which prompts you to change any specific viewing preferences
(also invokes the output preview simulation)

It's an interesting topic ...

The only true way to overcome the problem might be to proof from a
rendered format unfortunately ..

Jon

[andy_Haynes@adobeforums.com]

Bear with me, but proofing a live transparency? Is this how I make the PDF file? Or, after trial and error, how I check the PDF?

Still a little new to this stuff.

The files will have overprinting objects such as type (from a placed PSD or layered tif file) that will have a drop shadow applied; over a gradient fill in InDesign.

Andrew

[Laura_M.@adobeforums.com]

In order to view overprints accurately in Acrobat, you need to be sure that overprint preview is turned on. Also, in some cases (ie spots and transparency), flattening of transparency will also create overprinting objects. If they are using Reader: I know that Acrobat Reader 7.0 supports overprint preview. I am not certain in what version that support actually began.

When the file is printed by your print service provider they need to be sure that the RIP is set to honor overprinting rather than discard or ignore. Some print shops have their RIPs set to ignore overprint. They do this for a few reasons, but most commonly it seems to be in attempt to eliminate user created traps or to prevent problems in which someone has accidently set white to overprint, for example. Unfortunately it causes problems when trying to output files containing overprints and/or transparency applied.

If you want to print to a desktop printer that doesn't support overprinting, you can turn on the option "Simulate Overprint" in the Print dialog (in the Advanced settings, click on the Output "tab"). Note that this does just what it says, it simulates the overprinting rather than actually overprinting.

[Jon Bessant]

Hi Laura,

Overprint preview in the Reader started with Adobe Reader 7.0

Jon