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    • Brightness, contrast and saturation. More attractive More viewers.
    • The image used as the thumbnail should be related to the concept in the video.
    • Composition and cleanliness is essential for understanding the thumbnail at that instance.
    • Scaling plays an important role. Thumbnail should be clear and vivid even when zooming in and out. Because generally thumbnails are shown very small.
    • Don’t type text at the right corner since that is the place where the timestamp is shown.

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