Blue horizontal lines 1px high

  • 1
  • Problem
  • Updated 6 years ago
  • Acknowledged
I'm getting strange blue horizontal lines in LR 4.2RC which appear only in LR and export on the image - but which aren't there and appear in no other program. They look very digital.
Posted over at Adobe forums: http://forums.adobe.com/message/4709734

Any ideas what this is and why it's occurring? And importantly, what can be done about it?
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Fred

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Posted 6 years ago

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Chris Cox

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Could be a bug, but from the looks of them, they could also be due to bad RAM or a bad CPU (look a lot like errors in a CPU vector unit).
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Benjamin Warde, Employee

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Can you provide the original file? You could upload it to dropbox.com, or yousendit.com, or similar, and then post a link here.

Thanks,
Ben
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Fred

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As posted in thread limited to in OP, original file: http://cl.ly/image/0m3B0e1f3y1w

Also in thread post 13 cites that removing the xmp data resolved this problem, so somehow the xmp became corrupted and LR was manifesting these lines.

I've tested ram with memtest, all ok. If it looks like more than xmp corruption I'll look into testing CPU tomorrow.

Thanks for your time, and indeed for Lightroom :)

Edit:
I tried stripping individually - using BatchPuritier Lite 4.1 -:
EXIF
Photoshop image resources inc IPTC
XMP
Comments
ICC Profile
Adobe APP14 tag
JFIF header
Other hidden data
And, naturally, only removing XMP 'resets' the image (ie no rating, tags etc, and no develop adjustments) but I do still get the lines. Looks like corrupted XMP is causing LR to hiccup.
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Benjamin Warde, Employee

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Thanks Dan. Since it looks like this is a problem with corrupted metadata, it's hard to say if it's due to a Lightroom bug or not. But I've written the issue up in our bug database, and provided your file, so we'll see if the engineers can make anything of it.

-Ben