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Hiw to save the image as best resolution image

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Hi math works community,
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How to save the image in the fastest way as png.
lets suppose this is the image. how to save it.
% Generate test image contains values in 0:4
[~,~,I]=histcounts(peaks,5);
I = I-1;
imagesc(I)
colormap([1 0 0; % color of 0 value
0 1 0; % color of 1 value
0 0 1; % color of 2 value
0 0 0; % color of 3 value
1 1 1])% color of 4 value
set(gca,'Clim',[-0.5 max(I(:))+0.5]);
colorbar

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Accepted Answer

KALYAN ACHARJYA
KALYAN ACHARJYA on 18 Sep 2019
Edited: KALYAN ACHARJYA on 18 Sep 2019
How to save the image in the fastest way as png.
I am not sure about fastest way, one way:
[~,~,I]=histcounts(peaks,5);
I = I-1;
imagesc(I)
colormap([1 0 0; % color of 0 value
0 1 0; % color of 1 value
0 0 1; % color of 2 value
0 0 0; % color of 3 value
1 1 1])% color of 4 value
set(gca,'Clim',[-0.5 max(I(:))+0.5]);
colorbar
saveas(gcf,'test_image.png');

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