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[Octave-bug-tracker] [bug #56169] [octave forge] (image) images of class
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From: |
Andrew Janke |
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Subject: |
[Octave-bug-tracker] [bug #56169] [octave forge] (image) images of class double or single fail to convert to class uint8 |
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Date: |
Fri, 19 Apr 2019 21:53:11 -0400 (EDT) |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36 |
Follow-up Comment #1, bug #56169 (project octave):
Where was the `im` data sourced from? It's hard to reproduce this without a
full example. Can you attach an example input file to this issue?
Maybe you're not supposed to call im2uint8 on LAB-space image data? I don't
know that the data structures used by the image toolbox have enough metadata
for the functions to know whether they're RGB or LAB-space images. So maybe
it's seeing that the input is a double, assuming it's RGB, in which case the
values should have been in the interval [0.0 1.0], so these LAB values which
are >1 are just saturating it and pegging all the values to 1.0, which gets
normalized to 255 in uint8 space.
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