golang webp to gif

With the improvement of network bandwidth, more and more websites are beginning to use animated images to enrich user experience. There are various file formats for animated images, including WebP and GIF. WebP is a new image file format developed by Google. Compared with formats such as JPG and PNG, WebP can reduce the size of image files, while also having better compression ratio and higher image quality. GIF is an old-fashioned animated image format. Although its file size is larger than WebP, its performance in animated images is very good.

In this case, many webmasters and developers need to convert animated images in WebP format to animated images in GIF format. For this reason, we can use the golang programming language to implement this conversion process. Through this article, we will introduce to you how to use golang to convert animated images in WebP format into animated images in GIF format.

1. Preparation

Before converting WebP to GIF, we need to install some golang libraries and a C language compiler.

Install golang library:

go get -u github.com/chai2010/webp
go get -u github.com/lukeroth/ggif

Install C language compiler:

sudo apt-get install build-essential

In addition, we also need to prepare some animated images in WebP format and animated image files in GIF format .

2. Read animated images in WebP format

Before converting animated images in WebP format to animated images in GIF format, we need to read animated images in WebP format. In golang, there are many libraries available for us.

The code for reading animated images in WebP format is as follows:

package main

import (
    "fmt"
    "image"
    _ "image/png"
    "io"
    "os"

    "github.com/chai2010/webp"
)

func LoadWebPAnimatedImageFromFile(filename string) ([]*image.Paletted, int) {
    f, err := os.Open(filename)
    if err != nil {
        fmt.Println("error:", err)
        return nil, 0
    }
    defer f.Close()

    img, err := webp.DecodeAll(f)
    if err != nil {
        fmt.Println("error:", err)
        return nil, 0
    }

    return img.Frames, img.Delay[0]
}

Note that in the above code, we use the chai2010/webp library to read animated images in WebP format. Use this The library has two important benefits: first, it supports the reading of animated images, and second, it allows us to easily convert animated images in WebP format to static images or animated images in PNG format.

3. Convert to animated images in GIF format

After reading the animated images in WebP format, we need to convert them to animated images in GIF format. In golang, there is a library called "ggif" that can help us achieve this conversion process.

The code to convert animated images in GIF format is as follows:

package main

import (
    "fmt"
    "image"
    "os"

    "github.com/lukeroth/ggif"
)

func ConvertToGIF(frames []*image.Paletted, outname string, delay int) {
    f, err := os.Create(outname)
    if err != nil {
        fmt.Println("error:", err)
        return
    }
    defer f.Close()

    if err := ggif.EncodeAll(f, frames, delay); err != nil {
        fmt.Println("error:", err)
    }
}

In the above code, we use the ggif library to convert animated images in WebP format to animated images in GIF format. This library comes with good documentation and examples to help us implement various conversion techniques.

4. Complete code

Next, we will integrate the complete WebP to GIF code:

package main

import (
    "fmt"
    "image"
    _ "image/png"
    "io"
    "os"

    "github.com/chai2010/webp"
    "github.com/lukeroth/ggif"
)

func main() {
    frames, delay := LoadWebPAnimatedImageFromFile("input.webp")
    ConvertToGIF(frames, "output.gif", delay)
}

func LoadWebPAnimatedImageFromFile(filename string) ([]*image.Paletted, int) {
    f, err := os.Open(filename)
    if err != nil {
        fmt.Println("error:", err)
        return nil, 0
    }
    defer f.Close()

    img, err := webp.DecodeAll(f)
    if err != nil {
        fmt.Println("error:", err)
        return nil, 0
    }

    return img.Frames, img.Delay[0]
}

func ConvertToGIF(frames []*image.Paletted, outname string, delay int) {
    f, err := os.Create(outname)
    if err != nil {
        fmt.Println("error:", err)
        return
    }
    defer f.Close()

    if err := ggif.EncodeAll(f, frames, delay); err != nil {
        fmt.Println("error:", err)
    }
}

Before running this code, you need to convert "input.webp "Replace " with the name of your animated image file in WebP format.

5. Summary

In this article, we introduce to you how to use the golang programming language to convert animated images in WebP format to animated images in GIF format. Through this process, we can easily convert various animated images required by the website into suitable formats so that users can have a better experience when browsing the website.

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