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[Octave-bug-tracker] [bug #52624] gnuplot toolkit binary image is only b

From: Rik
Subject: [Octave-bug-tracker] [bug #52624] gnuplot toolkit binary image is only black pixels
Date: Wed, 13 Dec 2017 15:08:05 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0

Follow-up Comment #9, bug #52624 (project octave):

I think the algorithm you have now is right.

The interpretation does depend on the data type (integer vs. float) of the
"cdata" property.  Try this example

close all
figure ("colormap", [1 0 0; 0 1 0; 0 0 1]);  # RGB map
h = image ([0 1 2 3 4])
## "cdata" is double, therefore indexing begins at 1
## Displayed color is R R G B B
set (h, "cdata", uint8 ([0 1 2 3 4])
## "cdata" is now integer, indexing begins at 0
## Displayed color is R G B B B

Both FLTK and gnuplot produce the same image for the input above.


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