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[Octave-bug-tracker] [bug #54392] rgb2ind issue and images / gif creatio
From: |
Rick T |
Subject: |
[Octave-bug-tracker] [bug #54392] rgb2ind issue and images / gif creation |
Date: |
Thu, 26 Jul 2018 23:00:14 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Safari/537.36 |
URL:
<http://savannah.gnu.org/bugs/?54392>
Summary: rgb2ind issue and images / gif creation
Project: GNU Octave
Submitted by: ratulloch
Submitted on: Fri 27 Jul 2018 03:00:12 AM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Matlab Compatibility
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 4.4.0
Operating System: Any
_______________________________________________________
Details:
I'm trying to create an animated gif using code I found at
https://www.mathworks.com/matlabcentral/answers/94495-how-can-i-create-animated-gif-images-in-matlab
But I get an error
"error: Invalid call to rgb2ind. Correct usage is:
-- [X, MAP] = rgb2ind (RGB)
-- [X, MAP] = rgb2ind (R, G, B)
Additional help for built-in functions and operators is
available in the online version of the manual. Use the command
'doc <topic>' to search the manual index.
Help and information about Octave is also available on the WWW
at https://www.octave.org and via the address@hidden
mailing list."
The code is below. Are there any workarounds?
h = figure;
axis tight manual % this ensures that getframe() returns a consistent size
filename = 'testAnimated.gif';
for n = 1:0.5:5
% Draw plot for y = x.^n
x = 0:0.01:1;
y = x.^n;
plot(x,y)
drawnow
% Capture the plot as an image
frame = getframe(h);
im = frame2im(frame);
[imind,cm] = rgb2ind(im,256);
% Write to the GIF File
if n == 1
imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
else
imwrite(imind,cm,filename,'gif','WriteMode','append');
end
end
Nicholas Jankowski said the function is different from matlab and I should
post a bug. See he's email he sent below
Looking at the function calling structure on matlab:
https://www.mathworks.com/help/matlab/ref/rgb2ind.html
[X,map] = rgb2ind(RGB,n)
X = rgb2ind(RGB, map)
[X,map] = rgb2ind(RGB, tol)
[___] = rgb2ind(___,dither_option)
and octave:
https://octave.sourceforge.io/octave/function/rgb2ind.html
[x, map] = rgb2ind (rgb)
[x, map] = rgb2ind (R, G, B)
it appears that the current Octave implementation is not fully compatible.
Unless there's already something on the bug tracker that I didn't see in a
quick search, it should probably be logged as one:
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?54392>
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- [Octave-bug-tracker] [bug #54392] rgb2ind issue and images / gif creation,
Rick T <=