asp.net - How to resize animated gif file using imagemagick without destroying animation using C#? -

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i using imagemagick dll (refer: http://www.imagemagick.org) resize image,
when re-sized animated gif image going screw.

i using below code re-size image ( image type png, gif, jpg, bmp, tif ...)

imagemagickobject.magickimage imglarge = new imagemagickobject.magickimage();  object[] o = new object[] { strorig, "-resize", size, "-gravity", "center", "-colorspace", "rgb", "-extent", "1024x768", strdestnw }; imglarge.convert(ref o);

how can fixed it. see result image enter image description here

i think have extract every single frame gif first, resize every single frame , put together.

edit: this? not tested nor builded...

int maxframes=32; imagemagickobject.magickimage imglarge = new imagemagickobject.magickimage();    // first extract frames gif single png files for(int frame=0; frame<maxframes;frame++) {    object[] o = new object[] { string.format(strorig+"[{0}]", frame)        ,  string.format("tmp{0}.png", frame) };    imglarge.convert(ref o);     } // resize every single png files // add resized filenames stringbuilder stringbuilder filenames = new stringbuilder(); for(int frame=0; frame<maxframes;frame++) {    object[] o = new object[] { string.format("tmp{0}.png", frame)                 , "-resize"                 , size                  , "-gravity"                 , "center"                 , "-colorspace"                 , "rgb"                 , "-extent"                 , "1024x768"                 , string.format("tmp-resized{0}.png", frame) };    filenames.append(string.format("tmp-resized{0}.png", frame));    filenames.append(environment.newline);    imglarge.convert(ref o);     } // write resized filenames file file.writealltext("tmp-resized-files.txt", filenames); // create resize animated gif based on filenames in tmp-resized-files.txt    object[] o = new object[] { "@tmp-resized-files.txt"        ,  strdestnw };    imglarge.convert(ref o);

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