The conditions you have to meet are specific to the color-coded spaces. For example, if it provides a single number, every side of a tile in that space must add up to the number provided. It is possible – and common – for only half a tile to be within a color-coded space.
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，详情可参考谷歌浏览器【最新下载地址】
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.，这一点在Line官方版本下载中也有详细论述
Source: Computational Materials Science, Volume 266。WPS官方版本下载对此有专业解读