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

No, he just produced yet another red herring unrelated to the problem being discussed in this topic.

No, that is something completely unrelated. It has to do with using downsampled images for previews at zoom levels below 100%. You can't downsample and maintain exact edges for different layers at all positions.

I wonder if in this specific case (displaying on a monitor in Photoshop) if that is just a visual display rendering bug, since it goes away at closer zoom levels. I'm cool with monitor display anomalies that don't print. I just can't have lines that actually print and cost me thousands of dollars in redos of my company's money that Adobe caused us.

This rendering bug even exist in Photoshop itself. I often wondered about these artifacts in different zoom levels. And I just tested it again. At 25% a zero pixel gap shows the layer underneath.

LOL 🙂

It's our fault. Why can't we accept that a gap of zero means 1 pixel?

I am curious what will be the answer... i think i know by now....

Checked that.
True.
CS6 rendering is not working correctly, so please fix that bug finally.

BOOM! Volker just hit this one out of the park. Absolute proof that the rasterizer in CS6 and CC *should not* show a space when those two photos are placed touching each other with no gap. Proof that this isn't a problem with tiles or flattening. Fix the flawed rasterizer in Photoshop CS6 and CC please. A failure of Photoshop and no other app.

This problem occurs also in PDF 1.7 files if you place 2 pictures side by side without a gap between them. This is not only a problem with the tiles produced by flattened transparency. If you render a PDF 1.7 with pictures in a row Photoshop CC produce a visible 1 pixel gap between them. In Photoshop CS4 the pictures fit together perfectly.
Are the new PDF 1.7 files also "bad" files, or is this effect caused by Photoshop?

My workaround is to open the PDF files in Illustrator and export them as jpeg or png. No visible white lines.