Optimizing error: An error was encountered while flattening transparent objects

Explorer ,
Aug 17, 2017 Aug 17, 2017

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When I try to save as an optimized PDF, I get the following error message: An error was encountered while flattening transparent objects. I am on a Mac using the current version of Acrobat Pro DC.

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LEGEND , Aug 22, 2017 Aug 22, 2017

It's part of the (confusingly named) flattener preview under print production. 

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New Here ,
Aug 21, 2017 Aug 21, 2017

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I have the same issue right now, and need to get this resolved ASAP. I'm on a PC using the Adobe Cloud. It is with a substantial fillable form created in InDesign, then I export to .pdf and replace the file in the 40-page fillable form with the new .pdf. I don't remember selecting any transparency in the InDesign file. I'm not sure how to isolate the issue. I know it's not in the fillable part of the form. It seems to be in the .pdf. HELP!

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LEGEND ,
Aug 21, 2017 Aug 21, 2017

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Turn off transparency flattening if you don't need it.

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Explorer ,
Aug 21, 2017 Aug 21, 2017

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I have to flatten the images in my PDFs.

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LEGEND ,
Aug 21, 2017 Aug 21, 2017

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But you said you didn't think you put any transparency in the design? So what is it that you are flattening? What is your aim? I ask because people use "flatten" to mean different things. And it isn't usually images.

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Explorer ,
Aug 22, 2017 Aug 22, 2017

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Just to clarify, I DO use graphics with transparency and I am required to flatten them by the clipart artists that I purchased them from. Karla Design is the person who said she didn't think she had used any transparency.

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LEGEND ,
Aug 22, 2017 Aug 22, 2017

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Sorry for my confusion. If the PDF optimizer is failing in flattening transparency it's worth trying the transparency flattener instead.  May work, or fail with better messages.

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Explorer ,
Aug 22, 2017 Aug 22, 2017

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Thanks Test Screen Name. Where do I find the transparency flattener?

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LEGEND ,
Aug 22, 2017 Aug 22, 2017

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It's part of the (confusingly named) flattener preview under print production. 

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