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philipjscott avatar philipjscott commented on July 20, 2024 1

@disintegration

I had to tweak your example because the GIF's dimensions wouldn't change (the frames would be resized in the top-left corner, but the GIF would still remain the same size).

Just leaving this comment here for anyone that was stuck on this issue. Here's my updated example (height changes to maintain aspect ratio):

package main

import (
    "image"
    "image/draw"
    "image/gif"
    "os"
    "runtime"

    "github.com/disintegration/imaging"
)

func main() {
    // use all CPU cores for maximum performance
    runtime.GOMAXPROCS(runtime.NumCPU())

    w := 100

    inputFile, err := os.Open("giphy.gif")
    if err != nil {
        panic(err)
    }
    defer inputFile.Close()

    g, err := gif.DecodeAll(inputFile)
    if err != nil {
        panic(err)
    }

    var bounds image.Rectangle
    for i := range g.Image {
       img := imaging.Resize(g.Image[i], width, 0, imaging.NearestNeighbor)
       bounds = image.Rect(0, 0, width, img.Rect.Dy())
       g.Image[i] = image.NewPaletted(bounds, g.Image[i].Palette)
       draw.Draw(g.Image[i], bounds, img, image.Pt(0, 0), draw.Src)
    }
    g.Config.Height = bounds.Dy()
    g.Config.Width = bounds.Dx()

    outputFile, err := os.Create("dst2.gif")
    if err != nil {
        panic(err)
    }
    defer outputFile.Close()

    err = gif.EncodeAll(outputFile, g)
    if err != nil {
        panic(err)
    }
}

from imaging.

disintegration avatar disintegration commented on July 20, 2024

Hi,
image.Image can represent only one static image. To deal with animated gifs you will need to use gif.DecodeAll and gif.EncodeAll functions directly and process image frames one by one.

Here is the example:

package main

import (
    "image"
    "image/draw"
    "image/gif"
    "os"
    "runtime"

    "github.com/disintegration/imaging"
)

func main() {
    // use all CPU cores for maximum performance
    runtime.GOMAXPROCS(runtime.NumCPU())

    w, h := 100, 100

    inputFile, err := os.Open("giphy.gif")
    if err != nil {
        panic(err)
    }
    defer inputFile.Close()

    g, err := gif.DecodeAll(inputFile)
    if err != nil {
        panic(err)
    }

    for i := range g.Image {
        thumb := imaging.Thumbnail(g.Image[i], w, h, imaging.NearestNeighbor)
        g.Image[i] = image.NewPaletted(image.Rect(0, 0, w, h), g.Image[i].Palette)
        draw.Draw(g.Image[i], image.Rect(0, 0, w, h), thumb, image.Pt(0, 0), draw.Src)
    }

    outputFile, err := os.Create("dst2.gif")
    if err != nil {
        panic(err)
    }
    defer outputFile.Close()

    err = gif.EncodeAll(outputFile, g)
    if err != nil {
        panic(err)
    }
}

from imaging.

thoas avatar thoas commented on July 20, 2024

Impressive, thank you!

Is there a particular reason to not include this feature in imaging?

(I'm closing this issue btw)

from imaging.

disintegration avatar disintegration commented on July 20, 2024

You're welcome! The reason is - imaging manipulates images implementing image.Image interface. Animated GIF is a special gif.GIF type, which is a sequence of images plus timing information, so it just not fits this package well. But it's still easy to process frames one by one using same imaging functions.

from imaging.

iweixubin avatar iweixubin commented on July 20, 2024

resize https://en.wikipedia.org/wiki/File:SmallFullColourGIF.gif
it can create new gif file but the image is disordered

from imaging.

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