commit fbb5e12442316bb8e2e724d1a9bb891d0fc174df
Author: Laura <milanbartky@gmail.com>
Date:   Sun Sep 8 00:32:52 2024 +0200

    Initial commit

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..bfadae3
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,75 @@
+name: Build and Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        goos: [windows, linux, darwin]
+        goarch: [amd64, arm64]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23.1'
+
+      - name: Set up Environment
+        run: |
+          mkdir -p build
+          echo "package main" > version.go
+          echo "const Version = \"${{ github.ref_name }}\"" >> version.go
+          go install mvdan.cc/garble@latest
+
+      - name: Build for ${{ matrix.goos }}_${{ matrix.goarch }}
+        run: |
+          if [ "${{ matrix.goos }}" = "windows" ]; then EXT=".exe"; else EXT=""; fi
+          GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} garble -tiny build -o build/ffwebp_${{ github.ref_name }}_${{ matrix.goos }}_${{ matrix.goarch }}$EXT -ldflags -w
+
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: ffwebp_${{ github.ref_name }}_${{ matrix.goos }}_${{ matrix.goarch }}
+          path: ./build/ffwebp_${{ github.ref_name }}_${{ matrix.goos }}_${{ matrix.goarch }}*
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          draft: false
+          prerelease: false
+
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          path: ./build
+
+      - name: Upload all built binaries to release
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./build/
+          asset_name: ffwebp_${{ github.ref_name }}
+          asset_content_type: application/octet-stream
diff --git a/ffwebp_test.go b/ffwebp_test.go
new file mode 100644
index 0000000..c0c7ea1
--- /dev/null
+++ b/ffwebp_test.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"bytes"
+	"image/png"
+	"log"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+var (
+	TestFiles = []string{
+		"test/image.avif",
+		"test/image.bmp",
+		"test/image.gif",
+		"test/image.heic",
+		"test/image.heif",
+		"test/image.ico",
+		"test/image.jpg",
+		"test/image.png",
+		"test/image.tif",
+		"test/image.tiff",
+		"test/image.webp",
+		"test/image.jxl",
+	}
+)
+
+func TestFFWebP(t *testing.T) {
+	exe, err := filepath.Abs("bin/ffwebp.exe")
+	if err != nil {
+		log.Fatalf("Failed to get absolute path for ffwebp.exe: %v\n", err)
+	}
+
+	for _, file := range TestFiles {
+		log.Printf("Testing file: %s\n", file)
+
+		cmd := exec.Command(exe, "-i", file, "-f", "png", "-s")
+
+		// Capture the output (which is expected to be a PNG image)
+		var stdout bytes.Buffer
+
+		cmd.Stdout = &stdout
+
+		// Run the command
+		err := cmd.Run()
+		if err != nil {
+			out := strings.TrimSpace(stdout.String())
+
+			log.Println(" - FAILED")
+			log.Fatalf("Test failed for file: %s (%s)\n", file, out)
+		}
+
+		// Decode the captured stdout output as a PNG image
+		img, err := png.Decode(&stdout)
+		if err != nil {
+			log.Println(" - FAILED")
+			log.Fatalf("Failed to decode PNG image: %v\n", err)
+		}
+
+		if img == nil {
+			log.Println(" - FAILED")
+			log.Fatalf("No image data returned for file: %s\n", file)
+		}
+
+		log.Println(" - PASSED")
+	}
+}
diff --git a/flags.go b/flags.go
new file mode 100644
index 0000000..bfbf545
--- /dev/null
+++ b/flags.go
@@ -0,0 +1,187 @@
+package main
+
+import (
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Argument struct {
+	IsNil bool
+	Name  string
+	Value string
+}
+
+type Arguments struct {
+	Arguments map[string]Argument
+}
+
+var (
+	arguments Arguments
+)
+
+// I don't like golang flags package
+func init() {
+	arguments = Arguments{
+		Arguments: make(map[string]Argument),
+	}
+
+	var (
+		arg   string
+		val   string
+		index int
+
+		current Argument
+	)
+
+	for i := 1; i < len(os.Args); i++ {
+		arg = os.Args[i]
+
+		if arg[0] == '-' && len(arg) > 1 {
+			if arg[1] == '-' {
+				index = strings.Index(arg[2:], "=")
+
+				if index >= 0 {
+					val = ""
+
+					if index+1 < len(arg) {
+						val = arg[2+index+1:]
+					}
+
+					arguments.Set(Argument{
+						Name:  arg[2 : 2+index],
+						Value: val,
+					})
+				} else {
+					arguments.Set(Argument{
+						Name: arg[2:],
+					})
+				}
+
+				current = Argument{}
+			} else {
+				current = Argument{
+					Name: arg[1:],
+				}
+			}
+		} else {
+			current.Value = arg
+
+			arguments.Set(current)
+
+			current = Argument{}
+		}
+	}
+
+	if current.Name != "" {
+		arguments.Set(current)
+	}
+}
+
+func (a *Arguments) Set(arg Argument) {
+	a.Arguments[arg.Name] = arg
+}
+
+func (a *Arguments) Get(short, long string) Argument {
+	arg, ok := a.Arguments[short]
+
+	if !ok && long != short {
+		arg, ok = a.Arguments[long]
+	}
+
+	if !ok {
+		return Argument{
+			IsNil: true,
+			Name:  long,
+		}
+	}
+
+	return arg
+}
+
+func (a *Arguments) GetString(short, long string) string {
+	return a.Get(short, long).String()
+}
+
+func (a *Arguments) GetBool(short, long string, def bool) bool {
+	return a.Get(short, long).Bool(def)
+}
+
+func (a *Arguments) GetInt64(short, long string, def, min, max int64) int64 {
+	return a.Get(short, long).Int64(def, min, max)
+}
+
+func (a *Arguments) GetUint64(short, long string, def, min, max uint64) uint64 {
+	return a.Get(short, long).Uint64(def, min, max)
+}
+
+func (a *Arguments) GetFloat64(short, long string, def, min, max float64) float64 {
+	return a.Get(short, long).Float64(def, min, max)
+}
+
+func (a Argument) String() string {
+	return a.Value
+}
+
+func (a Argument) Bool(def bool) bool {
+	if a.IsNil {
+		return def
+	}
+
+	if a.Value == "false" || a.Value == "0" {
+		return false
+	}
+
+	return true
+}
+
+func (a Argument) Int64(def, min, max int64) int64 {
+	if a.IsNil {
+		return def
+	}
+
+	i, err := strconv.ParseInt(a.Value, 10, 64)
+	if err != nil {
+		return def
+	}
+
+	return minmax(i, min, max)
+}
+
+func (a Argument) Uint64(def, min, max uint64) uint64 {
+	if a.IsNil {
+		return def
+	}
+
+	i, err := strconv.ParseUint(a.Value, 10, 64)
+	if err != nil {
+		return def
+	}
+
+	return minmax(i, min, max)
+}
+
+func (a Argument) Float64(def, min, max float64) float64 {
+	if a.IsNil {
+		return def
+	}
+
+	i, err := strconv.ParseFloat(a.Value, 64)
+	if err != nil {
+		return def
+	}
+
+	return minmax(i, min, max)
+}
+
+func minmax[T int64 | uint64 | float64](val, min, max T) T {
+	if min != 0 && val < min {
+		return min
+	}
+
+	if max != 0 && val > max {
+		return max
+	}
+
+	return val
+}
diff --git a/format.go b/format.go
new file mode 100644
index 0000000..21fce30
--- /dev/null
+++ b/format.go
@@ -0,0 +1,177 @@
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/biessek/golang-ico"
+	"github.com/gen2brain/avif"
+	"github.com/gen2brain/heic"
+	"github.com/gen2brain/jpegxl"
+	"github.com/gen2brain/webp"
+	"golang.org/x/image/bmp"
+	"golang.org/x/image/tiff"
+)
+
+var (
+	OutputFormats = []string{
+		"jpeg",
+		"png",
+		"webp",
+		"gif",
+		"bmp",
+		"tiff",
+		"avif",
+		"jxl",
+		"ico",
+	}
+
+	InputFormats = []string{
+		"jpeg",
+		"png",
+		"webp",
+		"gif",
+		"bmp",
+		"tiff",
+		"avif",
+		"jxl",
+		"ico",
+		"heic",
+		"heif",
+	}
+)
+
+type Decoder func(io.Reader) (image.Image, error)
+
+func GetDecoderFromContent(in *os.File) (Decoder, error) {
+	buffer := make([]byte, 128)
+
+	_, err := in.Read(buffer)
+	if err != nil {
+		return nil, err
+	}
+
+	if _, err := in.Seek(0, io.SeekStart); err != nil {
+		return nil, err
+	}
+
+	if IsJPEG(buffer) {
+		return jpeg.Decode, nil
+	} else if IsPNG(buffer) {
+		return png.Decode, nil
+	} else if IsGIF(buffer) {
+		return gif.Decode, nil
+	} else if IsBMP(buffer) {
+		return bmp.Decode, nil
+	} else if IsWebP(buffer) {
+		return webp.Decode, nil
+	} else if IsTIFF(buffer) {
+		return tiff.Decode, nil
+	} else if IsICO(buffer) {
+		return ico.Decode, nil
+	} else if IsHEIC(buffer) {
+		return heic.Decode, nil
+	} else if IsAVIF(buffer) {
+		return avif.Decode, nil
+	} else if IsJpegXL(buffer) {
+		return jpegxl.Decode, nil
+	}
+
+	return nil, fmt.Errorf("unsupported input format")
+}
+
+func IsJPEG(buffer []byte) bool {
+	return len(buffer) > 2 && buffer[0] == 0xFF && buffer[1] == 0xD8
+}
+
+func IsPNG(buffer []byte) bool {
+	return len(buffer) > 8 && string(buffer[:8]) == "\x89PNG\r\n\x1a\n"
+}
+
+func IsGIF(buffer []byte) bool {
+	return len(buffer) > 6 && (string(buffer[:6]) == "GIF87a" || string(buffer[:6]) == "GIF89a")
+}
+
+func IsBMP(buffer []byte) bool {
+	return len(buffer) > 2 && string(buffer[:2]) == "BM"
+}
+
+func IsICO(buffer []byte) bool {
+	return len(buffer) > 4 && buffer[0] == 0x00 && buffer[1] == 0x00 && buffer[2] == 0x01 && buffer[3] == 0x00
+}
+
+func IsWebP(buffer []byte) bool {
+	// Check if its VP8L
+	if len(buffer) > 16 && string(buffer[12:16]) == "VP8L" {
+		return true
+	}
+
+	// Check if its WebP or RIFF WEBP
+	return len(buffer) > 12 && string(buffer[:4]) == "RIFF" && string(buffer[8:12]) == "WEBP"
+}
+
+func IsAVIF(buffer []byte) bool {
+	return len(buffer) > 12 && string(buffer[4:8]) == "ftyp" && string(buffer[8:12]) == "avif"
+}
+
+func IsTIFF(buffer []byte) bool {
+	return len(buffer) > 4 && (string(buffer[:4]) == "II*\x00" || string(buffer[:4]) == "MM\x00*")
+}
+
+func IsHEIC(buffer []byte) bool {
+	return len(buffer) > 12 && string(buffer[4:8]) == "ftyp" && (string(buffer[8:12]) == "heic" || string(buffer[8:12]) == "heix")
+}
+
+func IsJpegXL(buffer []byte) bool {
+	// Check for JPEG XL codestream (starts with 0xFF 0x0A)
+	if len(buffer) > 2 && buffer[0] == 0xFF && buffer[1] == 0x0A {
+		return true
+	}
+
+	// Check for JPEG XL container (starts with "JXL ")
+	return len(buffer) > 12 && string(buffer[:4]) == "JXL "
+}
+
+func OutputFormatFromPath(path string) string {
+	ext := strings.ToLower(filepath.Ext(path))
+
+	switch ext {
+	case ".webp", ".riff":
+		return "webp"
+	case ".jpg", ".jpeg":
+		return "jpeg"
+	case ".png":
+		return "png"
+	case ".gif":
+		return "gif"
+	case ".bmp":
+		return "bmp"
+	case ".tiff", ".tif":
+		return "tiff"
+	case ".avif", ".avifs":
+		return "avif"
+	case ".jxl":
+		return "jxl"
+	case ".ico":
+		return "ico"
+	}
+
+	return "webp"
+}
+
+func IsValidOutputFormat(format string) bool {
+	for _, f := range OutputFormats {
+		if f == format {
+			return true
+		}
+	}
+
+	return false
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..821dd33
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,19 @@
+module ffwebp
+
+go 1.23.1
+
+require (
+	github.com/biessek/golang-ico v0.0.0-20180326222316-d348d9ea4670
+	github.com/gen2brain/avif v0.3.2
+	github.com/gen2brain/heic v0.3.1
+	github.com/gen2brain/jpegxl v0.3.1
+	github.com/gen2brain/webp v0.4.5
+	golang.org/x/image v0.20.0
+)
+
+require (
+	github.com/ebitengine/purego v0.7.1 // indirect
+	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 // indirect
+	github.com/tetratelabs/wazero v1.8.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..1ab44a6
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,20 @@
+github.com/biessek/golang-ico v0.0.0-20180326222316-d348d9ea4670 h1:FQPKKjDhzG0T4ew6dm6MGrXb4PRAi8ZmTuYuxcF62BM=
+github.com/biessek/golang-ico v0.0.0-20180326222316-d348d9ea4670/go.mod h1:iRWAFbKXMMkVQyxZ1PfGlkBr1TjATx1zy2MRprV7A3Q=
+github.com/ebitengine/purego v0.7.1 h1:6/55d26lG3o9VCZX8lping+bZcmShseiqlh2bnUDiPA=
+github.com/ebitengine/purego v0.7.1/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
+github.com/gen2brain/avif v0.3.2 h1:XUR0CBl5n4ISFJE8/pc1RMEKt5KUVoW8InctN+M7+DQ=
+github.com/gen2brain/avif v0.3.2/go.mod h1:tdL2sV6oOJXBZZvT5iP55VEM1X2c3/yJmYKMJTl8fXg=
+github.com/gen2brain/heic v0.3.1 h1:ClY5YTdXdIanw7pe9ZVUM9XcsqH6CCCa5CZBlm58qOs=
+github.com/gen2brain/heic v0.3.1/go.mod h1:m2sVIf02O7wfO8mJm+PvE91lnq4QYJy2hseUon7So10=
+github.com/gen2brain/jpegxl v0.3.1 h1:QAcs68WXQUQRABPVu5p5MineuqfqnVd/JRiI+s7AEE4=
+github.com/gen2brain/jpegxl v0.3.1/go.mod h1:jLh4Fl9QaHkc1RsOJu4S2r20x+gSzjnuM+K8jOm4DEo=
+github.com/gen2brain/webp v0.4.5 h1:wolsWSKnYfnYaWUtGLx3EfXhLWVvVx9yZGof+JNGYgY=
+github.com/gen2brain/webp v0.4.5/go.mod h1:giUCZaJt7D8ae9AjSq4gC3QKUuA9SD8LZy0o2zcWxMI=
+github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 h1:YLvr1eE6cdCqjOe972w/cYF+FjW34v27+9Vo5106B4M=
+github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25/go.mod h1:kLgvv7o6UM+0QSf0QjAse3wReFDsb9qbZJdfexWlrQw=
+github.com/tetratelabs/wazero v1.8.0 h1:iEKu0d4c2Pd+QSRieYbnQC9yiFlMS9D+Jr0LsRmcF4g=
+github.com/tetratelabs/wazero v1.8.0/go.mod h1:yAI0XTsMBhREkM/YDAK/zNou3GoiAce1P6+rp/wQhjs=
+golang.org/x/image v0.20.0 h1:7cVCUjQwfL18gyBJOmYvptfSHS8Fb3YUDtfLIZ7Nbpw=
+golang.org/x/image v0.20.0/go.mod h1:0a88To4CYVBAHp5FXJm8o7QbUl37Vd85ply1vyD8auM=
+golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
+golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/help.go b/help.go
new file mode 100644
index 0000000..794c510
--- /dev/null
+++ b/help.go
@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+)
+
+func help() {
+	if !arguments.GetBool("h", "help", false) {
+		return
+	}
+
+	info("  __  __              _")
+	info(" / _|/ _|            | |")
+	info("| |_| |___      _____| |__  _ __")
+	info("|  _|  _\\ \\ /\\ / / _ \\ '_ \\| '_ \\")
+	info("| | | |  \\ V  V /  __/ |_) | |_) |")
+	info("|_| |_|   \\_/\\_/ \\___|_.__/| .__/")
+	info("                           | |")
+	info("                    %s |_|", Version)
+
+	info("\nffwebp -i <input> [output] [options]")
+
+	var max int
+
+	for name := range options {
+		if len(name) > max {
+			max = len(name)
+		}
+	}
+
+	var formatted []string
+
+	for name, help := range options {
+		formatted = append(formatted, fmt.Sprintf(" - %-*s: %s", max, name, help))
+	}
+
+	sort.Strings(formatted)
+
+	info(strings.Join(formatted, "\n"))
+
+	info("\nInput formats:  %s", strings.Join(InputFormats, ", "))
+	info("Output formats: %s", strings.Join(OutputFormats, ", "))
+
+	os.Exit(0)
+}
diff --git a/image.go b/image.go
new file mode 100644
index 0000000..664a656
--- /dev/null
+++ b/image.go
@@ -0,0 +1,91 @@
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"os"
+
+	"github.com/biessek/golang-ico"
+	"github.com/gen2brain/avif"
+	"github.com/gen2brain/jpegxl"
+	"github.com/gen2brain/webp"
+	"golang.org/x/image/bmp"
+	"golang.org/x/image/tiff"
+)
+
+var (
+	options = map[string]string{
+		"c / colors":      "Number of colors (1-256) (gif)",
+		"e / effort":      "Encoder effort level (0-10) (jxl)",
+		"f / format":      "Output format (avif, bmp, gif, jpeg, jxl, png, tiff, webp)",
+		"h / help":        "Show this help page",
+		"l / lossless":    "Use lossless compression (webp)",
+		"m / method":      "Encoder method (0=fast, 6=slower-better) (webp)",
+		"r / ratio":       "YCbCr subsample-ratio (0=444, 1=422, 2=420, 3=440, 4=411, 5=410) (avif)",
+		"s / silent":      "Do not print any output",
+		"q / quality":     "Set quality (0-100) (avif, jpeg, jxl, webp)",
+		"x / exact":       "Preserve RGB values in transparent area (webp)",
+		"z / compression": "Compression type (0=uncompressed, 1=deflate, 2=lzw, 3=ccittgroup3, 4=ccittgroup4) (tiff)",
+	}
+)
+
+func ReadImage(input *os.File) (image.Image, error) {
+	decoder, err := GetDecoderFromContent(input)
+	if err != nil {
+		return nil, err
+	}
+
+	return decoder(input)
+}
+
+func WriteImage(output *os.File, img image.Image, format string) error {
+	switch format {
+	case "webp":
+		options := GetWebPOptions()
+
+		LogWebPOptions(options)
+
+		return webp.Encode(output, img, options)
+	case "jpeg":
+		options := GetJpegOptions()
+
+		LogJpegOptions(options)
+
+		return jpeg.Encode(output, img, options)
+	case "png":
+		return png.Encode(output, img)
+	case "gif":
+		options := GetGifOptions()
+
+		LogGifOptions(options)
+
+		return gif.Encode(output, img, options)
+	case "bmp":
+		return bmp.Encode(output, img)
+	case "tiff":
+		options := GetTiffOptions()
+
+		LogTiffOptions(options)
+
+		return tiff.Encode(output, img, options)
+	case "avif":
+		options := GetAvifOptions()
+
+		LogAvifOptions(options)
+
+		return avif.Encode(output, img, options)
+	case "jxl":
+		options := GetJxlOptions()
+
+		LogJxlOptions(options)
+
+		jpegxl.Encode(output, img, options)
+	case "ico":
+		return ico.Encode(output, img)
+	}
+
+	return fmt.Errorf("unsupported output format: %s", format)
+}
diff --git a/log.go b/log.go
new file mode 100644
index 0000000..e8d1109
--- /dev/null
+++ b/log.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+var (
+	silent bool
+)
+
+func info(fm string, args ...interface{}) {
+	if silent {
+		return
+	}
+
+	fmt.Printf(fm+"\n", args...)
+}
+
+func fatalf(code int, fm string, args ...interface{}) {
+	fmt.Printf("ERROR: "+fm+"\n", args...)
+
+	os.Exit(code)
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..481cdac
--- /dev/null
+++ b/main.go
@@ -0,0 +1,81 @@
+package main
+
+import (
+	"os"
+)
+
+func main() {
+	help()
+
+	silent = arguments.GetBool("s", "silent", false)
+
+	// Read input file
+	input := arguments.GetString("i", "input")
+
+	var in *os.File
+
+	if input == "" {
+		in = os.Stdin
+	} else {
+		var err error
+
+		in, err = os.OpenFile(input, os.O_RDONLY, 0)
+		if err != nil {
+			fatalf(1, "Failed to open input file: %s", err)
+		}
+	}
+
+	// Read image
+	if in == os.Stdin {
+		info("Decoding input from stdin...")
+	} else {
+		info("Decoding input image...")
+	}
+
+	img, err := ReadImage(in)
+	if err != nil {
+		fatalf(4, "Failed to read image: %s", err)
+	}
+
+	// Read output format
+	format := arguments.GetString("f", "format")
+
+	// Read output file
+	output := arguments.GetString("", "")
+
+	var out *os.File
+
+	if output == "" {
+		if format == "" {
+			format = "webp"
+		}
+
+		out = os.Stdout
+		silent = true
+	} else {
+		var err error
+
+		if format == "" {
+			format = OutputFormatFromPath(output)
+		}
+
+		out, err = os.OpenFile(output, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o644)
+		if err != nil {
+			fatalf(2, "Failed to open output file: %s", err)
+		}
+	}
+
+	if !IsValidOutputFormat(format) {
+		fatalf(3, "Invalid output format: %s", format)
+	}
+
+	info("Using output format: %s", format)
+
+	// Write image
+	info("Encoding output image...")
+
+	err = WriteImage(out, img, format)
+	if err != nil {
+		fatalf(5, "Failed to write image: %s", err)
+	}
+}
diff --git a/options.go b/options.go
new file mode 100644
index 0000000..24860c9
--- /dev/null
+++ b/options.go
@@ -0,0 +1,149 @@
+package main
+
+import (
+	"image"
+	"image/gif"
+	"image/jpeg"
+
+	"github.com/gen2brain/avif"
+	"github.com/gen2brain/jpegxl"
+	"github.com/gen2brain/webp"
+	"golang.org/x/image/tiff"
+)
+
+func GetWebPOptions() webp.Options {
+	return webp.Options{
+		Lossless: arguments.GetBool("l", "lossless", false),
+		Quality:  int(arguments.GetUint64("q", "quality", 100, 0, 100)),
+		Method:   int(arguments.GetUint64("m", "method", 4, 0, 6)),
+		Exact:    arguments.GetBool("x", "exact", false),
+	}
+}
+
+func LogWebPOptions(options webp.Options) {
+	info("Using output options:")
+	info(" - lossless: %v", options.Lossless)
+	info(" - quality:  %v", options.Quality)
+	info(" - method:   %v", options.Method)
+	info(" - exact:    %v", options.Exact)
+}
+
+func GetJpegOptions() *jpeg.Options {
+	return &jpeg.Options{
+		Quality: int(arguments.GetUint64("q", "quality", 100, 0, 100)),
+	}
+}
+
+func LogJpegOptions(options *jpeg.Options) {
+	info("Using output options:")
+	info(" - quality: %v", options.Quality)
+}
+
+func GetGifOptions() *gif.Options {
+	return &gif.Options{
+		NumColors: int(arguments.GetUint64("c", "colors", 256, 0, 256)),
+	}
+}
+
+func LogGifOptions(options *gif.Options) {
+	info("Using output options:")
+	info(" - colors: %v", options.NumColors)
+}
+
+func GetTiffOptions() *tiff.Options {
+	return &tiff.Options{
+		Compression: GetTiffCompressionType(),
+	}
+}
+
+func LogTiffOptions(options *tiff.Options) {
+	info("Using output options:")
+	info(" - compression: %s", TiffCompressionTypeToString(options.Compression))
+}
+
+func GetAvifOptions() avif.Options {
+	return avif.Options{
+		Quality:           int(arguments.GetUint64("q", "quality", 100, 0, 100)),
+		QualityAlpha:      int(arguments.GetUint64("qa", "quality-alpha", 100, 0, 100)),
+		Speed:             int(arguments.GetUint64("s", "speed", 6, 0, 10)),
+		ChromaSubsampling: GetAvifYCbCrSubsampleRatio(),
+	}
+}
+
+func LogAvifOptions(options avif.Options) {
+	info("Using output options:")
+	info(" - quality: %v", options.Quality)
+	info(" - quality-alpha: %v", options.QualityAlpha)
+	info(" - speed: %v", options.Speed)
+	info(" - chroma subsampling: %s", options.ChromaSubsampling.String())
+}
+
+func GetJxlOptions() jpegxl.Options {
+	return jpegxl.Options{
+		Quality: int(arguments.GetUint64("q", "quality", 100, 0, 100)),
+		Effort:  int(arguments.GetUint64("e", "effort", 7, 0, 10)),
+	}
+}
+
+func LogJxlOptions(options jpegxl.Options) {
+	info("Using output options:")
+	info(" - quality: %v", options.Quality)
+	info(" - effort: %v", options.Effort)
+}
+
+func GetTiffCompressionType() tiff.CompressionType {
+	compression := arguments.GetUint64("z", "compression", 1, 0, 4)
+
+	switch compression {
+	case 0:
+		return tiff.Uncompressed
+	case 1:
+		return tiff.Deflate
+	case 2:
+		return tiff.LZW
+	case 3:
+		return tiff.CCITTGroup3
+	case 4:
+		return tiff.CCITTGroup4
+	}
+
+	return tiff.Deflate
+}
+
+func TiffCompressionTypeToString(compression tiff.CompressionType) string {
+	switch compression {
+	case tiff.Uncompressed:
+		return "uncompressed"
+	case tiff.Deflate:
+		return "deflate"
+	case tiff.LZW:
+		return "lzw"
+	case tiff.CCITTGroup3:
+		return "ccittgroup3"
+	case tiff.CCITTGroup4:
+		return "ccittgroup4"
+	default:
+		return "unknown"
+	}
+}
+
+func GetAvifYCbCrSubsampleRatio() image.YCbCrSubsampleRatio {
+	sampleRatio := arguments.GetUint64("r", "sample-ratio", 0, 0, 5)
+
+	switch sampleRatio {
+	case 0:
+		return image.YCbCrSubsampleRatio444
+	case 1:
+		return image.YCbCrSubsampleRatio422
+	case 2:
+		return image.YCbCrSubsampleRatio420
+	case 3:
+		return image.YCbCrSubsampleRatio440
+	case 4:
+		return image.YCbCrSubsampleRatio411
+	case 5:
+		return image.YCbCrSubsampleRatio410
+	}
+
+	return image.YCbCrSubsampleRatio444
+}
diff --git a/test/image.avif b/test/image.avif
new file mode 100644
index 0000000..f8e029c
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diff --git a/test/image.bmp b/test/image.bmp
new file mode 100644
index 0000000..b255eb0
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diff --git a/test/image.gif b/test/image.gif
new file mode 100644
index 0000000..ac78ba9
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diff --git a/test/image.heic b/test/image.heic
new file mode 100644
index 0000000..dd76335
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diff --git a/test/image.heif b/test/image.heif
new file mode 100644
index 0000000..23cd868
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diff --git a/test/image.ico b/test/image.ico
new file mode 100644
index 0000000..147bdcb
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diff --git a/test/image.jpg b/test/image.jpg
new file mode 100644
index 0000000..2d6a14b
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diff --git a/test/image.jxl b/test/image.jxl
new file mode 100644
index 0000000..d1a5a7d
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diff --git a/test/image.png b/test/image.png
new file mode 100644
index 0000000..d633ae1
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diff --git a/test/image.tif b/test/image.tif
new file mode 100644
index 0000000..442041a
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diff --git a/test/image.tiff b/test/image.tiff
new file mode 100644
index 0000000..e8a135c
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diff --git a/test/image.webp b/test/image.webp
new file mode 100644
index 0000000..122741b
Binary files /dev/null and b/test/image.webp differ
diff --git a/version.go b/version.go
new file mode 100644
index 0000000..15baba7
--- /dev/null
+++ b/version.go
@@ -0,0 +1,3 @@
+package main
+
+const Version = "development"