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webstore 图片要求

The Chrome Web Store is getting a new look! In the coming weeks, we’ll roll out a new version of the store that requires new images. If you want to provide images in the old sizes, as well, you can do so using the “current store look” tab.
Provide images that the store can use to promote your item. Although only the small box image is required, your item might be featured more prominently if you also provide a large box image, a marquee image, or both.
Fill the entire region, using square corners and no padding (full bleed).
Use a medium or dark background.
Avoid text in the image as much as possible.
Don’t put white elements along the edges of the image; the edges should be well defined.
Don't use a screenshot.
Your image should display well when reduced to half size.
Note: The size of promotional images in the current Chrome Web Store is different from the size in the new-look store.