The Screen Transparency Anomaly

[Shawn007]

I am creating a background with grey-scale shading underneath and am adding colour by overlaying a coloured box with a "screen" transparency. (see attached)

Oddly, when I do this, what were invisible lines (the shapes of the background objects) now show as dotted stroked lines.  I cannot figure out what is causing this. Any help would be appreciated. I am using CS6.

[Dynamic Office]

Hi,

Could you export the file and see if the lines are still there on the exported file, please.

[Shawn007]

Hi, I attempted to save as PDF and exported to JPG, in both cases the dotted lines appeared - though they were more faint. In the PDF file, when zoomed in, the lines appear to be raster.  (file is all vector)

[Monika Gause]

Which document color mode?

Which color exactly? Are those greyscales? Is the other one a spot color?

Can you perhaps upload a demo file?

[Shawn007]

Hi - working RGB (file is for web use). No spot colours. Grey is mixed/process.  Not sure how to upload demo?

[Monika Gause]

Please upload it to Dropbox or the like and post a link here.

[Shawn007]

Try this:   SampleFile.ai - Google Drive

Thank you.

[Monika Gause · Accepted solution]

Thank you for the file.

I tried to set up a demo file myself, but could not trigger it.

In your file it's visible.

It's just bad rendering. In the current version with the improved GPU acceleration, this effect is gone. But that doesn't help you.

Depending on the printing process this might or might not become a problem.

You might try if selecting all and then Object > Flatten transparency helps.

But only do this on a copy, because it won't be easily editable afterwards.

[Shawn007]

Monika, thank you for looking at this - yes, flatten transparency did resolve the immediate issue. Cheers.

[Monika Gause]

You're welcome.