Just use
myPalette := append(palette.WebSafe, image.Transparent)
You can't add transparent color to plan9 palette since it's already full.
Better to use WebSafe!
On Friday, 4 December 2015 14:05:56 UTC+5:30, Brian Picciano wrote:
>
> Ah, good call. So I've replaced the encode/decode nonsense with that and
> things still work. Except transparency still isn't working :(
>
> Here is the function in question, the ctx simply holds onto a bunch of the
> values, like the final gif.GIF being created and such:
>
> func (c *ctx) addFrame(img image.Image) error {
> opts := gif.Options{
> NumColors: 256,
> Drawer: draw.FloydSteinberg,
> }
> b := img.Bounds()
>
> // More or less taken from the image/gif package
> pimg := image.NewPaletted(b, palette.Plan9[:opts.NumColors])
> if opts.Quantizer != nil {
> pimg.Palette = opts.Quantizer.Quantize(make(color.Palette,
> 0, opts.NumColors), img)
> }
> opts.Drawer.Draw(pimg, b, img, image.ZP)
>
> spf := 1 / float64(c.fps)
>
> c.g.Image = append(c.g.Image, pimg)
> c.g.Delay = append(c.g.Delay, int(spf*100))
> return nil
> }
>
>
>
> On Friday, December 4, 2015 at 1:19:35 AM UTC-7, Caleb Spare wrote:
>>
>> I'm not sure about the transparency thing.
>>
>> In order to transform your image.Images into *image.Paletted, you can
>> do what the gif encoder does. The code is very short:
>>
>> https://github.com/golang/go/blob/master/src/image/gif/writer.go#L358-L366
>>
>> (Basically, check if it's already an *image.Palleted; if not, use a
>> quantizer to re-render it as a paletted image.)
>>
>> -Caleb
>>
>> On Thu, Dec 3, 2015 at 11:33 PM, Brian Picciano
>> <mediocr...@gmail.com> wrote:
>> > Hi there! I'm currently attempting to make a gif out of a series of
>> > image.Image instances (each the same dimensions). I see that to build
>> the
>> > gif.GIF struct I need to somehow turn my image.Images into
>> *image.Paletted,
>> > but after browsing the various image apis I still don't see an obvious
>> way
>> > to do that. Currently I'm using gif.Encode to encode a single frame
>> into a
>> > buffer, then gif.DecodeAll to decode it back out into its own gif.GIF,
>> and
>> > then append that to my actual gif. This is super ugly and feels very
>> wrong,
>> > and it also seems to break transparency. Any help would be appreciated,
>> > thanks!
>> >
>> > --
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