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Id: 111871
Status: resolved
Priority: 0/
Queue: Imager
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Owner: Nobody in particular
Requestors: tony [...] develop-help.com
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History Show all quoted text
  Mon Feb 08 03:37:44 2016 tony [...] develop-help.com - Ticket created
Subject: autolevels_mono doesn't level a 2 level image to B&W
Date: Mon, 8 Feb 2016 19:37:27 +1100
To: bug-Imager [...] rt.cpan.org
From: Tony Cook <tony [...] develop-help.com>
autolevels_mono has two problems here: - the scale value is an integer for 8-bit images, and so if the range between min_lum and max_lum doesn't divide evenly into 255 the "white" level isn't white - there's an off-by-one error calculating min_lum and max_lum, so even if scale is floating point the "black" and "white" source levels are converted to just above black and white. As an optimization, the 8-bit code should use a look-up table.
  Sun Feb 21 02:23:14 2016 TONYC [...] cpan.org - Status changed from 'new' to 'patched'
  Mon Sep 19 00:19:44 2016 TONYC [...] cpan.org - Correspondence added
On Mon Feb 08 03:37:44 2016, tony@develop-help.com wrote: Show quoted text
> autolevels_mono has two problems here: > > - the scale value is an integer for 8-bit images, and so if the range > between min_lum and max_lum doesn't divide evenly into 255 the > "white" level isn't white > > - there's an off-by-one error calculating min_lum and max_lum, so even > if scale is floating point the "black" and "white" source levels are > converted to just above black and white. > > As an optimization, the 8-bit code should use a look-up table.
Fixed in 1.005.
  Mon Sep 19 00:20:00 2016 TONYC [...] cpan.org - Status changed from 'patched' to 'resolved'