Comments (5)
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.
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.
Impressive, thank you!
Is there a particular reason to not include this feature in imaging?
(I'm closing this issue btw)
from imaging.
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.
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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from imaging.