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This is the original image of 200x200

enter image description here

On downscaling the image to 100x100. There is a semi transparent shadow near the lines and some pixels are not completely opaque.

enter image description here

The command used for scaling: ffmpeg -i test.png -vf scale=100x100 out.png

I have also tried scaling with this command: ffmpeg -i test.png -vf scale=100x100 -sws_flags neighbor out.png

The shadows are gone but the top line has also vanished.

enter image description here

How do I fix this ?

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