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[rew <685881@xxxxxxxxxxxxxxxxxx>]

moeep: Your test doesn't provide any confusion: It shows that without
image cache, it all works fine.


** Tags added: corruption image imagecache

** Changed in: enblend
       Status: New => Confirmed

** Changed in: enblend
   Importance: Medium => High

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https://bugs.launchpad.net/bugs/685881

Title:
  Horizontal lines when combining large images

Status in Enblend:
  Confirmed

Bug description:
  When combining large images (output size approx >=25000x5000px) enblend creates horizontal lines like:
http://downloads.moeeeep.com/panoramabug/t1/output.png
It seems to me, that these horizontal lines only occur on a 360° panorama, when an image has to be "split" like:
http://downloads.moeeeep.com/panoramabug/t1/example.png
This brought me the idea to emulate this behavior and to create a testcase out of it:
Warning, huge files ahead (30000x10000px)
- The panorama file that enblend should see in its memory:
 http://downloads.moeeeep.com/panoramabug/t1/t0_lzw.tif (881K)
- The split file:
 http://downloads.moeeeep.com/panoramabug/t1/t1_lzw.tif (775K)

I did put them into a folder an run:
 enblend -v -o out_lzw.tif t0_lzw.tif t1_lzw.tif
Output (screenshot):
 http://downloads.moeeeep.com/panoramabug/t1/output.png (22K)

Here's the gimp file for those who want to extend the example:
 http://downloads.moeeeep.com/panoramabug/t1/t.xcf (3.1M)

The number of horizontal lines seem to correlate to the number of
images split at the edge of the image.

enblend version: 3.2
environment: http://downloads.moeeeep.com/panoramabug/t1/system.txt