Sorry, this site:
https://www.socketloop.com/tutorials/golang-convert-png-transparent-background-image-to-jpg-or-jpeg-image
On Tue, Nov 8, 2016 at 3:24 PM, Jordan Stinson <jordan.stinso...@gmail.com>
wrote:
> I realize that there isn't an alpha channel. My understanding is that the
> image/draw package would blend the colours according to the alpha value in
> the image and the blending equation.
>
> This site seems to suggest that it will work.
>
> On Tue, Nov 8, 2016 at 2:37 PM, Jonathan Wills <runningw...@gmail.com>
> wrote:
>
>> jpeg does not support transparency.
>>
>> On Tue, Nov 8, 2016 at 12:14 PM, <jordan.stinso...@gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I'm trying to write out a png with an alpha component as a jpeg. As I
>>> understand it, I should be able to use the draw package to do this.
>>>
>>> // src is an image.RGBA
>>> newImg := image.NewRGBA(src.Bounds())
>>>
>>> draw.Draw(newImg, newImg.Bounds(), &image.Uniform{color.White},
>>> image.Point{}, draw.Src)
>>> draw.Draw(newImg, newImg.Bounds(), src, src.Bounds().Min, draw.Over)
>>>
>>> return jpeg.Encode(w, newImg, &jpeg.Options{Quality: 85})
>>>
>>> I expected this blend the src rgb components with the white background
>>> using the alpha value. It appears to be ignoring the alpha value all
>>> together. Is this expected? I'm using go1.7.1.
>>>
>>> Thanks!
>>>
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>>
>>
>
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