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[Octave-bug-tracker] [bug #47746] imwrite writes incorrect TIFF pixel va

From: Mike Miller
Subject: [Octave-bug-tracker] [bug #47746] imwrite writes incorrect TIFF pixel values from uint8 array on i686-linux-gnu
Date: Sun, 8 May 2016 22:14:05 +0000 (UTC)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0 
Follow-up Comment #4, bug #47746 (project octave):

On x86_64:


1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$1 = 0
(gdb) c
Continuing.

Breakpoint 1, …
1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$2 = 256.99999999999994
(gdb) c
Continuing.

Breakpoint 1, …
1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$3 = 513.99999999999989
(gdb) c
Continuing.

Breakpoint 1, …
1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$4 = 770.99999999999989


On i686:


1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$1 = 0
(gdb) c
Continuing.

Breakpoint 1, …
1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$2 = 257
(gdb) c 
Continuing.

Breakpoint 1, …
1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$3 = 514
(gdb) c 
Continuing.

Breakpoint 1, …
1112                        Magick::Color c (grey, grey, grey);
(gdb) p grey
$1 = 771


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