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能获取每个像素的 rgba 值吗？ #30

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scarletsky opened this issue Aug 15, 2014 · 4 comments
Closed

能获取每个像素的 rgba 值吗？ #30

scarletsky opened this issue Aug 15, 2014 · 4 comments

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@scarletsky
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@nylen
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nylen commented Oct 2, 2014

I have the same question.

@yolio2003
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我也有这个需求。。。跪求~~~

@scarletsky
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我后来还是用 node-canvas 解决这个需求了。
如果需要在 windows 环境下使用 node-canvas 的话，可以参照下这个PR Automattic/node-canvas#458

@zhangyuanwei
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其实可以用RAW格式实现读取RGB。
images里面的RAW格式很简单，开头四个字节是固定的 "RAW\n"，然后是4个字节的宽度，4个字节的高度，然后就是像素数据了。
具体可以看Raw.cc的源码。
不过比较悲剧的是，当初写码的时候，把Alpha通道去掉了。所以只能得到RGB数据。。。
囧。。。

@oxUnd oxUnd closed this as completed Jan 11, 2019
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5 participants
@nylen @yolio2003 @oxUnd @zhangyuanwei @scarletsky