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[Octave-bug-tracker] [bug #63060] imread returns logical data for 8-bit


From: Rik
Subject: [Octave-bug-tracker] [bug #63060] imread returns logical data for 8-bit TrueColor PNG image
Date: Wed, 5 Oct 2022 15:25:12 -0400 (EDT)

Follow-up Comment #5, bug #63060 (project octave):

Interestingly, imfinfo identifies the file as a greyscale file with bit depth
of 1.


imfinfo white_background_3.png 
ans =

  scalar structure containing the fields:

    Filename = /home/rik/wip/Projects_Mine/octave-dev/white_background_3.png
    FileModDate =  5-Oct-2022 12:18:19
    FileSize = 4891
    Format = PNG
    FormatVersion = 
    Width = 65
    Height = 65
    BitDepth = 1
    ColorType = grayscale


It is sufficient to change even one pixel to a value which is not black or
white for the detection algorithm to correctly identify the PNG file as 8-bit
TrueColor.


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