Nigel, I added the sRGB, cHRM, and gAMA chunks, extended the Encoder
structure, and use it like this in my own code:
case ".jpg":
err = jpeg.Encode(file, p, &jpeg.Options{
Quality: 95,
})
if err != nil {
log.Fatal(err)
}
case ".png":
// err = png.Encode(file, p) // colorspace and gamma unspecified
err = (&png.Encoder{IsSRGB: true, RenderingIntent:
png.Perceptual}).Encode(file, p)
if err != nil {
log.Fatal(err)
}
case ".tiff":
// err = tiff.Encode(file, p, nil) // uncompressed
err = tiff.Encode(file, p, &tiff.Options{
Compression: tiff.Deflate,
Predictor: true,
})
if err != nil {
log.Fatal(err)
}
I updated https://github.com/golang/go/issues/20613 about the details.
On Thu, Sep 28, 2017 at 7:38 AM, Michael Jones <michael.jo...@gmail.com>
wrote:
> thanks, i'll make notes there
>
> On Wed, Sep 27, 2017 at 11:01 PM, Nigel Tao <nigel...@golang.org> wrote:
>
>> On Thu, Sep 28, 2017 at 10:28 AM, Michael Jones <michael.jo...@gmail.com>
>> wrote:
>> > Not quite related, but if changes are going to happen, I want to add
>> (or see
>> > someone add) colorspace tags to the PNG code and the TIFF code.
>>
>> It's not exactly what you're asking for, but there are already issues
>> https://github.com/golang/go/issues/11420 "x/image/draw: color
>> space-correct interpolation" and
>> https://github.com/golang/go/issues/20613 "image/png: don't ignore PNG
>> gAMA chunk". There might be other issues filed, I didn't do an
>> exhaustive search.
>>
>
>
>
> --
> Michael T. Jones
> michael.jo...@gmail.com
>
--
Michael T. Jones
michael.jo...@gmail.com
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