Why does MATLAB play with the contrast of my image after saving it?

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Ali Almakhmari
Ali Almakhmari 2022-7-21
评论： Ali Almakhmari 2022-7-23
I have a very weird problem that I hope someone can help me with. So Attached are two pictures of almost the exact same location in a map of a desert, one named "true" and one named "weird". The "true" image is the one I have and downloaded directly from the source in a tiff format. And the "weird" image is the true image taken into MATLAB with the following piece of code:
pictureData = imread("true.tiff");
h = imshow(pictureData);
imwrite(h.CData,"weird.tiff")
Now I don't understand why my map's colors are very slightly adjusted after saving the new image where the new image has lighter colors (the colors are almost the same I know...but still there is a noticeable difference that will skew my results)
I would like to do some analysis on my images but I am afraid that MATLAB will ruin my pictures and skew my results with this arbitrary change in colors. Is this because my images are gigantic (>50MB)? Or is it because I am saving those images incorrectly? I don't really know whats going.
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DGM
DGM 2022-7-23
编辑：DGM 2022-7-23
I used the code as I posted above. I'm not sure what the difference is.
Difference in version/environment?
Difference between 'true.tiff' and 'true.jpeg'?
What happens if you try to save the file using imwrite() directly on pictureData instead of on h.Cdata?
Ali Almakhmari
Ali Almakhmari 2022-7-23
I tried all your suggestions and they didn't help..except one. I think I will downgrade to MATLAB 2019b and see if it works. I really appreciate all your help. Let me know if you have any further suggestions.

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