MATLAB: Creating .PNG image from temperature values

image processing

The size of my table (i.e. variables) is 462×622 double
I used the code below to create an image:
imagesc(image); colormap jet; axis off
However, the pixel size of the resulting image is 420×560.
How can I make an image with the same pixel size as the variables?

Best Answer

I guess you are using saveas() or some other function to save the .png file. They are not suitable for maintaining the resolution. Use imwrite() as shows in the following lines
image = round(rescale(image, 1, 256));
imwrite(image, jet, 'image.png');
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