Again, the answer to this question varies from company to company. And again, testing is the way to find out what works best. Typically, weekends and mornings seem to be times when multiple emails are opened, but since your audience may have different habits, it's best to experiment and then use your data to decide.
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。关于这个话题，im钱包官方下载提供了深入分析
「我記得早上醒來看到他的小臉，嘴裡含著小奶嘴，感覺就像我需要從夢中醒來一樣。」。关于这个话题，服务器推荐提供了深入分析
You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.