Error creating an animated GIF in Matlab

Question

Wissem-Eddine KHATLA 2022-2-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1650520-error-creating-an-animated-gif-in-matlab

回答： Wissem-Eddine KHATLA 2022-2-16

采纳的回答： DGM

在 MATLAB Online 中打开

Hello everyone,

I am trying to create a GIF showing the evolution of a height field (variable noted "h_reel") through time.

Unfortunately, I am encoutering an error and I am unable to performe what I am attempting to do... Here is my script :

p = figure(21);
filename = 'test.gif';
for i = index_intersection:nfichier
    imagesc(h_reel(:,:,i));
    [X, Y] = meshgrid([1:2048]*echelle,[1:2048]*echelle);
    surf(X,Y,h_reel(:,:,i));
    caxis([min(h_reel,[],'all') max(h_reel,[],'all')])
    title(num2str(i))
    shading interp;
    %pause 0.25;
    frame = getframe(p);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    if i == 1
        imwrite(imind,cm,filename,'gif','LoopCount',inf);
    else
        imwrite(imind,cm,filename,'gif','WriteMode','append');
    end
end

Obtaining this error :

Error using matlab.internal.imagesci.wgifc
Can only append to GIF89a format GIFs.
Error in writegif (line 306)
matlab.internal.imagesci.wgifc(mat, map, filename,writemode,disposalmethod,delaytime,...
Error in imwrite (line 566)
        feval(fmt_s.write, data, map, filename, paramPairs{:});

Could someone help me to solve this problem please ?

Thank you in advance.

Sincerely,

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Answer 1

DGM 2022-2-15

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1650520-error-creating-an-animated-gif-in-matlab#answer_896900

编辑：DGM 2022-2-15

在 MATLAB Online 中打开

This problem happens when you try to append to a file that doesn't already exist.

for i = index_intersection:nfichier
    % ...
end

If index_intersection is not 1, then the case for writing the first frame won't happen.

You can try something like this.

indices = index_intersection:nfichier;
for framenum = 1:numel(indices)
    imagesc(h_reel(:,:,framenum));
    [X, Y] = meshgrid([1:2048]*echelle,[1:2048]*echelle);
    surf(X,Y,h_reel(:,:,framenum));
    caxis([min(h_reel,[],'all') max(h_reel,[],'all')])
    title(num2str(framenum))
    shading interp;
    %pause 0.25;
    frame = getframe(p);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    if framenum == 1
        imwrite(imind,cm,filename,'gif','LoopCount',inf);
    else
        imwrite(imind,cm,filename,'gif','WriteMode','append');
    end
end

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Answer 2

yanqi liu 2022-2-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1650520-error-creating-an-animated-gif-in-matlab#answer_897175

在 MATLAB Online 中打开

yes，sir，may be add some check flag，such as

p = figure(21);
filename = 'test.gif';
check_flag = 0;
for i = index_intersection:nfichier
    imagesc(h_reel(:,:,i));
    [X, Y] = meshgrid([1:2048]*echelle,[1:2048]*echelle);
    surf(X,Y,h_reel(:,:,i));
    
    caxis([min(h_reel,[],'all') max(h_reel,[],'all')])
    
    title(num2str(i))
    shading interp;
    %pause 0.25;
    
    frame = getframe(p);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    
    % use check
    if check_flag == 0
        imwrite(imind,cm,filename,'gif','LoopCount',inf,'DelayTime',0.2);
        check_flag = 1;
    else
        imwrite(imind,cm,filename,'gif','WriteMode','append','DelayTime',0.2);
    end
end