dongwuqi4243
2017-11-28 15:42
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将图像从* image.YCbCr转换为* image.RGBA

I am loading a jpeg from the disk, and I would like to do some RGBA operations on it.

However, since the jpeg is not RGBA, i get an error when I try to use it as such:

thumbnail,err:=jpeg.Decode(imageAsReader)
...
return thumbnail.(*image.RGBA)

yeileds the error:

interface conversion: image.Image is *image.YCbCr, not *image.RGBA

Is there an easy way to convert the image to RGBA once I have loaded it in memory? (Other operations are in RGBA later on, so that is the color model I want to use in memory).

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我正在从磁盘加载jpeg,并且我想对其进行一些RGBA操作。

但是,由于jpeg不是RGBA,因此当我尝试使用jpeg时出现错误:

  thumbnail,err:= jpeg 解码(imageAsReader)
 ... 
返回缩略图。(* image.RGBA)
   
 
 

出现错误: < pre> 接口转换:image.Image是* image.YCbCr,而不是* image.RGBA

是否有一种简单的方法可以将图像转换为RGBA 一旦我将其加载到内存中? (其他操作稍后将在RGBA中进行,所以这是我要在内存中使用的颜色模型。)

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  • dongxu198714 2017-11-28 19:44
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    As the comments suggest, you have to create a new image and draw into it: b := thumbnail.Bounds() m := image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy())) draw.Draw(m, m.Bounds(), thumbnail, b.Min, draw.Src)

    YCbCr is a sub-sampled image, so it doesn't map directly to the 4-bytes-per-pixel of RGBA.

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