Legacy ImageMagick Discussions Archive

I'm attempting to convert multi-page PDFs to PNGs (any individual image types will work), but am consistently getting horizontal white lines after the conversion:



These are reminiscent of display issues on Adobe InDesign PDFs (where PDFs for this use case will be created), though I've never had seen them once a document is printed, etc.

Version: Command: The issue seems to persist independent of reordering, including/excluding colorspace, density, quality. Relatively new to IM, so it's very likely that I'm missing something obvious. Thanks in advance!

Folder with input/output files

This command works fine for me on IM 7.0.7.11 Q16 Mac OSX
Note that you should put -colorspace sRGB before the (vector) PDF input. Or use profiles after reading the PDF.

Also note that -quality is different form png than for jpg. So your value may or may not be good. See http://www.imagemagick.org/script/comma ... hp#quality

Furthermore, in IM 7, magick replaces convert, otherwise, you get the IM 6 convert

You might check your version of Ghostscript and libpng to be sure you are using a current version. My GS is 9.21. My libpng is 1.6.30

You're not seeing any white hairlines on your export? Weird..

I tried your command as is (thanks for the note on convert > magick) and am still getting the same result. Ghostscript and libpng look like they're both current (9.22 and 1.6.34).

I ran my command 20 times and none of them had striping like on yours. Did you try my command without the -quality?

Copied and pasted your exact command and left out the -quality and it's still there. Out of curiosity, I installed everything fresh on a separate machine and got the same result.

I am at a loss unless there is a bug in our newer Ghostscript or PNG version?

What is your platform and what tool are you using to view it?

Here is my result:


When you view it in your same tool that you view your own result, does it show any stripes?

I'm on Mac OS X, too. The viewing tool doesn't seem to have any effect (tried Preview, Photoshop) and your result appears without the lines in both viewers.

What version of Mac OSX. I am on Sierra.

How did you install IM and the needed delegates? From ImageMagick, Homebrew, MacPorts?

Still on El Capitan.

I installed both IM and Ghostscript through Homebrew.

I do not know what more to suggest other than trying to back down your Ghostscript and PNG to the same versions I have. Or try installing IM 6 in place of IM 7.

By the way, I install all my delegates from MacPorts and then install IM from source. See viewtopic.php?f=1&t=21502&p=88202&hilit ... rts#p88202. This is of course much more complicated than just using Homebrew.