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how do I change the contrast of a video?

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Pavel Kuzmitsky
Pavel Kuzmitsky 2022-11-8
编辑： Chandler Hall 2022-11-8
the problem is as follows:
this is the result that matlab outputs:
the same frame, but converted to video:
how can this problem be solved?
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Pavel Kuzmitsky
Pavel Kuzmitsky 2022-11-8
as you can see in the frame from the video, the grids and the image are worse visible (the additional ring is not visible)

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Chandler Hall
Chandler Hall 2022-11-8
编辑：Chandler Hall 2022-11-8
By default, videos are created using lossy compression which will remove fine details. Consider
img = ...
v = videowriter('filename.avi', 'Archival');
open(v);
writevideo(v, img);
close(v);
to create a video with no compression.

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