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Georgina RannardScience correspondent
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Kevin Church/BBC News
Hello. I have recently been spending a lot of time dithering. In image processing, dithering is the act of applying intentional perturbations or noise in order to compensate for the information lost during colour reduction, also known as quantisation. In particular, I’ve become very interested in a specific type of dithering and its application to colour palettes of arbitrary or irregular colour distributions. Before going into detail however, let’s briefly review the basics of image dithering.
从收入端来看，外卖渠道成为瑞幸营收增长的重要助推器。受外卖平台补贴拉动，瑞幸外卖订单量大幅提升，2025年第三季度外卖在整体营收中的占比已从常规的10%-20%攀升至30%以上，带动总净收入达152.87亿元人民币，同比增长50.2%。