save indexed images in MATLAB -

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i have image point curse showsenter image description here

x ,y index rgb

the index values important me , want save image , use later. when using 

imwrite(im, 'importantim.png' , 'png')

the created image not have index value. here resulting saved image (png format); enter image description here

i produce im , below

im=zeros([1204 1204]);

with loop add data it.


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