Why image.YCbCr don't have a Set method?

[kawamoto]

Hello

Why image.YCbCr don't have a Set method?

http://golang.org/pkg/image/#YCbCr

I'd like to change a single pixel of JPEG file, but I don't know how to do it.

I might not understand such details about JPEG...

Kawamoto

[Larry Clapp]

YCbCr isn't a pixel-addressable format. "There is one Y sample per pixel, but each Cb and Cr sample can span one or more pixels." -- http://golang.org/src/pkg/image/ycbcr.go?s=1514:1661#L36

http://golang.org/doc/articles/image_draw.html says

The result of decoding an image format might not be an image.RGBA: decoding a GIF results in an image.Paletted, decoding a JPEG results in aycbcr.YCbCr, and the result of decoding a PNG depends on the image data. To convert any image to an image.RGBA:

    b := src.Bounds()
    m := image.NewRGBA(b)
    draw.Draw(m, b, src, b.Min, draw.Src)

Hope that points you down the right track.

-- Larry

[Yasutaka Kawamoto]

Thanks Larry.

2013/7/15 Larry Clapp <la...@theclapp.org>:

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