1. Arthur W Westerberg
2. Carnegie Mellon University

From 6ce0525ba37cb26eab47592a174462 Mon Sep 17 00: From: rieger Date: Mon, 8 Feb 2010 11:30:01 +0100 Subject: PATCH initial setup of thesis.

I'm impressed how hard it is to do a simple task: print/save as PDF some transparent vectored images, as Microsoft Word and PowerPoint graphics.

Word can save as PDF and keep the transparency unchecking the PDF/A Compliant, but non vector images (PNG JPE) quality is very bad (pixellated) and there is no option to customize PDF image compression.

Others apps like PDF Creator gives the user image compression options, but they don't keep the transparency.

Summary:

• App: Transparency / image quality
• Word builtin .pdf converter (Export or Save As): Keep transparency / Bad images resolution
• PDF creator, doPDF, CutePDF writer: NO transparency! / Configurable images resolution

Adobe PDF works, but it is paid:Print and save transparent artwork

Flattening may be necessary when you print or when you save or export to other formats that don’t support transparency. To retain transparency without flattening when you create PDF files, save your file as Adobe PDF 1.4 (Acrobat 5.0) or later.

I don't want to flatten my images

Is there any free non PostScript(garbage) printer so I can print in PDF version >= 1.4?

Arthur W Westerberg

2 Answers

One advice that is consistently given by Adobe is to use CMYK for imageswith transparency that are to be printed.

The Adobe articleAbout flatteningsays this :

If you apply transparency to objects on a spread, all colors on that spread convert to the transparency blend space you’ve chosen (Edit > Transparency Blend Space), either Document RGB or Document CMYK, even if they’re not involved with transparency. Converting all the colors results in consistency across any two same-colored objects on a spread, and avoids more dramatic color behavior at the edges of transparency.

The above advice seems to imply only that it is bad to mix RGB and CMYKhandling where transparency is concerned.(I would really love to understand what means that beautiful rhetoric of'edges of transparency'.)

But the following text is more specific:

Depending on your workflow, do one of the following:

Carnegie Mellon University

• If you create documents for print only, choose Document CMYK for the blend space.
• If you create documents for web only, choose Document RGB.
• If you create documents for both print and web, decide which is more important, and then choose the blend space that matches the final output.

I would therefore advise to convert your images and blend space toCMYK. I do not know if that will help in your case, as the above articleonly gives hints which it does not explain.

Note that JPEG and PNG images are RGB. TIFF is better adapted to CMYK.

You may have a box checked in your settings that you should not. In the options panel, check that your ISO 19005-1 compliant (PDF/A) field is unchecked. This will prevent transparency's in artwork.

...I finally discovered that the problem was arising only when I had 'ISO 19005-1 compliant (PDF/A)' selected under the PDF Options. Deselecting that option causes the image to be displayed correctly. Further investigation shows that transparency in objects is forbidden in 'ISO 19005-1 compliant (PDF/A)' formatted documents...

Credit to: In Publisher 2010 save as pdf causes png pictures to have black backgrounds. How can I fix this?

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