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lossy encoding a 16 bit TIF file : severe artifiacts in decompressed image #660

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boxerab opened this issue Nov 18, 2015 · 3 comments
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lossy encoding a 16 bit TIF file : severe artifiacts in decompressed image #660

boxerab opened this issue Nov 18, 2015 · 3 comments

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@boxerab
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boxerab commented Nov 18, 2015

Using the latest master branch from github, I encoded a 16 bit, 512x512 TIF file with the following command line parameters:

-b 32,32 -I

Decoded image had severe black "cloud" artifacts in image.

Attached is a screenshot of the issue: the original image is on the left, decompressed on right.

16_bit_artifact
@boxerab
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boxerab commented Nov 18, 2015

Update: switching to lossless compress shows no artifact, so I am guessing the bug lies in the 9-7 DWT transform.

@boxerab
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boxerab commented Nov 18, 2015

Increasing number of resolution levels from 2 upwards, the artifact only appears when there are 5 resolution levels or higher. 2-4 are fine. Also, fine if lossless. So, it looks like a 9-7 DWT bug, for n >= 5.

@boxerab
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boxerab commented Nov 18, 2015

False Alarm! Artifact is a problem with GIMP viewer, which is probably using Jasper to view jp2.

@boxerab boxerab closed this as completed Nov 18, 2015
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@boxerab