Add standard CLI support for Image Resizer (#44287)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
Adds a dedicated command-line interface (CLI) executable for Image
Resizer (PowerToys.ImageResizerCLI.exe)

## Command
`PowerToys.ImageResizerCLI.exe [options] [files...]`

## Options (High Level)

| Option (aliases) | Description |
|-----------------|-------------|
| `--help` | Show help |
| `--show-config` | Print current effective configuration |
| `--destination`, `-d` | Output directory (optional) |
| `--width`, `-w` | Width |
| `--height`, `-h` | Height |
| `--unit`, `-u` | Unit (Pixel / Percent / Inch / Centimeter) |
| `--fit`, `-f` | Fit mode (Fill / Fit / Stretch) |
| `--size`, `-s` | Preset size index (supports `0` for Custom) |
| `--shrink-only` | Only shrink (do not enlarge) |
| `--replace` | Replace original |
| `--ignore-orientation` | Ignore EXIF orientation |
| `--remove-metadata` | Strip metadata |
| `--quality`, `-q` | JPEG quality (1–100) |
| `--keep-date-modified` | Preserve source last-write time |
| `--file-name` | Output filename format |

## Example usage
```
# Show help
PowerToys.ImageResizerCLI.exe --help

# Show current config
PowerToys.ImageResizerCLI.exe --show-config

# Resize with explicit dimensions
PowerToys.ImageResizerCLI.exe --width 800 --height 600 .\image.png

# Use preset size 0 (Custom) and output to a folder
PowerToys.ImageResizerCLI.exe --size 0 -d "C:\Output" .\photo.png

# Preserve source LastWriteTime
PowerToys.ImageResizerCLI.exe --width 800 --height 600 --keep-date-modified -d "C:\Output" .\image.png
```

![imageresize](https://github.com/user-attachments/assets/437fc1c2-b655-4168-9c85-b1561eeef3b4)

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## PR Checklist

- [ ] Closes: #xxx
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issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [x] **Localization:** All end-user-facing strings can be localized
- [x] **Dev docs:** Added/updated
- [x] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
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for new binaries and localization folder
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pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
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- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/imageresizer/ui/Cli/CliLogger.cs

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using ManagedCommon;
+
+namespace ImageResizer.Cli
+{
+    public static class CliLogger
+    {
+        private static bool _initialized;
+
+        public static void Initialize(string logSubFolder)
+        {
+            if (!_initialized)
+            {
+                Logger.InitializeLogger(logSubFolder);
+                _initialized = true;
+            }
+        }
+
+        public static void Info(string message) => Logger.LogInfo(message);
+
+        public static void Warn(string message) => Logger.LogWarning(message);
+
+        public static void Error(string message) => Logger.LogError(message);
+    }
+}

src/modules/imageresizer/ui/Cli/CliSettingsApplier.cs

@@ -0,0 +1,122 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Globalization;
+
+using ImageResizer.Models;
+using ImageResizer.Properties;
+
+namespace ImageResizer.Cli
+{
+    /// <summary>
+    /// Applies CLI options to Settings object.
+    /// Separated from executor logic for Single Responsibility Principle.
+    /// </summary>
+    public static class CliSettingsApplier
+    {
+        /// <summary>
+        /// Applies CLI options to the settings, overriding default values.
+        /// </summary>
+        /// <param name="cliOptions">The CLI options to apply.</param>
+        /// <param name="settings">The settings to modify.</param>
+        public static void Apply(CliOptions cliOptions, Settings settings)
+        {
+            // Handle complex size options first
+            ApplySizeOptions(cliOptions, settings);
+
+            // Apply simple property mappings
+            ApplySimpleOptions(cliOptions, settings);
+        }
+
+        private static void ApplySizeOptions(CliOptions cliOptions, Settings settings)
+        {
+            if (cliOptions.Width.HasValue || cliOptions.Height.HasValue)
+            {
+                ApplyCustomSizeOptions(cliOptions, settings);
+            }
+            else if (cliOptions.SizeIndex.HasValue)
+            {
+                ApplyPresetSizeOption(cliOptions, settings);
+            }
+        }
+
+        private static void ApplyCustomSizeOptions(CliOptions cliOptions, Settings settings)
+        {
+            // Set dimensions (0 = auto-calculate for aspect ratio preservation)
+            // Implementation: ResizeSize.ConvertToPixels() returns double.PositiveInfinity for 0 in Fit mode,
+            // causing Math.Min(scaleX, scaleY) to preserve aspect ratio by selecting the non-zero scale.
+            // For Fill/Stretch modes, 0 uses the original dimension instead.
+            settings.CustomSize.Width = cliOptions.Width ?? 0;
+            settings.CustomSize.Height = cliOptions.Height ?? 0;
+
+            // Apply optional properties
+            if (cliOptions.Unit.HasValue)
+            {
+                settings.CustomSize.Unit = cliOptions.Unit.Value;
+            }
+
+            if (cliOptions.Fit.HasValue)
+            {
+                settings.CustomSize.Fit = cliOptions.Fit.Value;
+            }
+
+            // Select custom size (index = Sizes.Count)
+            settings.SelectedSizeIndex = settings.Sizes.Count;
+        }
+
+        private static void ApplyPresetSizeOption(CliOptions cliOptions, Settings settings)
+        {
+            var index = cliOptions.SizeIndex.Value;
+
+            if (index >= 0 && index < settings.Sizes.Count)
+            {
+                settings.SelectedSizeIndex = index;
+            }
+            else
+            {
+                Console.Error.WriteLine(string.Format(CultureInfo.InvariantCulture, Resources.CLI_WarningInvalidSizeIndex, index));
+                CliLogger.Warn($"Invalid size index: {index}");
+            }
+        }
+
+        private static void ApplySimpleOptions(CliOptions cliOptions, Settings settings)
+        {
+            if (cliOptions.ShrinkOnly.HasValue)
+            {
+                settings.ShrinkOnly = cliOptions.ShrinkOnly.Value;
+            }
+
+            if (cliOptions.Replace.HasValue)
+            {
+                settings.Replace = cliOptions.Replace.Value;
+            }
+
+            if (cliOptions.IgnoreOrientation.HasValue)
+            {
+                settings.IgnoreOrientation = cliOptions.IgnoreOrientation.Value;
+            }
+
+            if (cliOptions.RemoveMetadata.HasValue)
+            {
+                settings.RemoveMetadata = cliOptions.RemoveMetadata.Value;
+            }
+
+            if (cliOptions.JpegQualityLevel.HasValue)
+            {
+                settings.JpegQualityLevel = cliOptions.JpegQualityLevel.Value;
+            }
+
+            if (cliOptions.KeepDateModified.HasValue)
+            {
+                settings.KeepDateModified = cliOptions.KeepDateModified.Value;
+            }
+
+            if (!string.IsNullOrEmpty(cliOptions.FileName))
+            {
+                settings.FileName = cliOptions.FileName;
+            }
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Commands/ImageResizerRootCommand.cs

@@ -0,0 +1,90 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+using ImageResizer.Cli.Options;
+
+namespace ImageResizer.Cli.Commands
+{
+    /// <summary>
+    /// Root command for the ImageResizer CLI.
+    /// </summary>
+    public sealed class ImageResizerRootCommand : RootCommand
+    {
+        public ImageResizerRootCommand()
+            : base("PowerToys Image Resizer - Resize images from command line")
+        {
+            HelpOption = new HelpOption();
+            ShowConfigOption = new ShowConfigOption();
+            DestinationOption = new DestinationOption();
+            WidthOption = new WidthOption();
+            HeightOption = new HeightOption();
+            UnitOption = new UnitOption();
+            FitOption = new FitOption();
+            SizeOption = new SizeOption();
+            ShrinkOnlyOption = new ShrinkOnlyOption();
+            ReplaceOption = new ReplaceOption();
+            IgnoreOrientationOption = new IgnoreOrientationOption();
+            RemoveMetadataOption = new RemoveMetadataOption();
+            QualityOption = new QualityOption();
+            KeepDateModifiedOption = new KeepDateModifiedOption();
+            FileNameOption = new FileNameOption();
+            ProgressLinesOption = new ProgressLinesOption();
+            FilesArgument = new FilesArgument();
+
+            AddOption(HelpOption);
+            AddOption(ShowConfigOption);
+            AddOption(DestinationOption);
+            AddOption(WidthOption);
+            AddOption(HeightOption);
+            AddOption(UnitOption);
+            AddOption(FitOption);
+            AddOption(SizeOption);
+            AddOption(ShrinkOnlyOption);
+            AddOption(ReplaceOption);
+            AddOption(IgnoreOrientationOption);
+            AddOption(RemoveMetadataOption);
+            AddOption(QualityOption);
+            AddOption(KeepDateModifiedOption);
+            AddOption(FileNameOption);
+            AddOption(ProgressLinesOption);
+            AddArgument(FilesArgument);
+        }
+
+        public HelpOption HelpOption { get; }
+
+        public ShowConfigOption ShowConfigOption { get; }
+
+        public DestinationOption DestinationOption { get; }
+
+        public WidthOption WidthOption { get; }
+
+        public HeightOption HeightOption { get; }
+
+        public UnitOption UnitOption { get; }
+
+        public FitOption FitOption { get; }
+
+        public SizeOption SizeOption { get; }
+
+        public ShrinkOnlyOption ShrinkOnlyOption { get; }
+
+        public ReplaceOption ReplaceOption { get; }
+
+        public IgnoreOrientationOption IgnoreOrientationOption { get; }
+
+        public RemoveMetadataOption RemoveMetadataOption { get; }
+
+        public QualityOption QualityOption { get; }
+
+        public KeepDateModifiedOption KeepDateModifiedOption { get; }
+
+        public FileNameOption FileNameOption { get; }
+
+        public ProgressLinesOption ProgressLinesOption { get; }
+
+        public FilesArgument FilesArgument { get; }
+    }
+}

src/modules/imageresizer/ui/Cli/ImageResizerCliExecutor.cs

@@ -0,0 +1,124 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Threading;
+
+using ImageResizer.Models;
+using ImageResizer.Properties;
+
+namespace ImageResizer.Cli
+{
+    /// <summary>
+    /// Executes Image Resizer CLI operations.
+    /// Instance-based design for better testability and Single Responsibility Principle.
+    /// </summary>
+    public class ImageResizerCliExecutor
+    {
+        /// <summary>
+        /// Runs the CLI executor with the provided command-line arguments.
+        /// </summary>
+        /// <param name="args">Command-line arguments.</param>
+        /// <returns>Exit code.</returns>
+        public int Run(string[] args)
+        {
+            var cliOptions = CliOptions.Parse(args);
+
+            if (cliOptions.ParseErrors.Count > 0)
+            {
+                foreach (var error in cliOptions.ParseErrors)
+                {
+                    Console.Error.WriteLine(error);
+                    CliLogger.Error($"Parse error: {error}");
+                }
+
+                CliOptions.PrintUsage();
+                return 1;
+            }
+
+            if (cliOptions.ShowHelp)
+            {
+                CliOptions.PrintUsage();
+                return 0;
+            }
+
+            if (cliOptions.ShowConfig)
+            {
+                CliOptions.PrintConfig(Settings.Default);
+                return 0;
+            }
+
+            if (cliOptions.Files.Count == 0 && string.IsNullOrEmpty(cliOptions.PipeName))
+            {
+                Console.WriteLine(Resources.CLI_NoInputFiles);
+                CliOptions.PrintUsage();
+                return 1;
+            }
+
+            return RunSilentMode(cliOptions);
+        }
+
+        private int RunSilentMode(CliOptions cliOptions)
+        {
+            var batch = ResizeBatch.FromCliOptions(Console.In, cliOptions);
+            var settings = Settings.Default;
+            CliSettingsApplier.Apply(cliOptions, settings);
+
+            CliLogger.Info($"CLI mode: processing {batch.Files.Count} files");
+
+            // Use accessible line-based progress if requested or detected
+            bool useLineBasedProgress = cliOptions.ProgressLines ?? false;
+            int lastReportedMilestone = -1;
+
+            var errors = batch.Process(
+                (completed, total) =>
+                {
+                    var progress = (int)((completed / total) * 100);
+
+                    if (useLineBasedProgress)
+                    {
+                        // Milestone-based progress (0%, 25%, 50%, 75%, 100%)
+                        int milestone = (progress / 25) * 25;
+                        if (milestone > lastReportedMilestone || completed == (int)total)
+                        {
+                            lastReportedMilestone = milestone;
+                            Console.WriteLine(string.Format(CultureInfo.InvariantCulture, Resources.CLI_ProgressFormat, progress, completed, (int)total));
+                        }
+                    }
+                    else
+                    {
+                        // Traditional carriage return mode
+                        Console.Write(string.Format(CultureInfo.InvariantCulture, "\r{0}", string.Format(CultureInfo.InvariantCulture, Resources.CLI_ProgressFormat, progress, completed, (int)total)));
+                    }
+                },
+                settings,
+                CancellationToken.None);
+
+            if (!useLineBasedProgress)
+            {
+                Console.WriteLine();
+            }
+
+            var errorList = errors.ToList();
+            if (errorList.Count > 0)
+            {
+                Console.Error.WriteLine(string.Format(CultureInfo.InvariantCulture, Resources.CLI_CompletedWithErrors, errorList.Count));
+                CliLogger.Error($"Processing completed with {errorList.Count} error(s)");
+                foreach (var error in errorList)
+                {
+                    Console.Error.WriteLine(string.Format(CultureInfo.InvariantCulture, "  {0}: {1}", error.File, error.Error));
+                    CliLogger.Error($"  {error.File}: {error.Error}");
+                }
+
+                return 1;
+            }
+
+            CliLogger.Info("CLI batch completed successfully");
+            Console.WriteLine(Resources.CLI_AllFilesProcessed);
+            return 0;
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/DestinationOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class DestinationOption : Option<string>
+    {
+        private static readonly string[] _aliases = ["--destination", "-d", "/d"];
+
+        public DestinationOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Destination)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/FileNameOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class FileNameOption : Option<string>
+    {
+        private static readonly string[] _aliases = ["--filename", "-n"];
+
+        public FileNameOption()
+            : base(_aliases, Properties.Resources.CLI_Option_FileName)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/FilesArgument.cs

@@ -0,0 +1,17 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class FilesArgument : Argument<string[]>
+    {
+        public FilesArgument()
+            : base("files", Properties.Resources.CLI_Option_Files)
+        {
+            Arity = ArgumentArity.ZeroOrMore;
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/FitOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class FitOption : Option<ImageResizer.Models.ResizeFit?>
+    {
+        private static readonly string[] _aliases = ["--fit", "-f"];
+
+        public FitOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Fit)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/HeightOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class HeightOption : Option<double?>
+    {
+        private static readonly string[] _aliases = ["--height", "-h"];
+
+        public HeightOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Height)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/HelpOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class HelpOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--help", "-?", "/?"];
+
+        public HelpOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Help)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/IgnoreOrientationOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class IgnoreOrientationOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--ignore-orientation"];
+
+        public IgnoreOrientationOption()
+            : base(_aliases, Properties.Resources.CLI_Option_IgnoreOrientation)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/KeepDateModifiedOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class KeepDateModifiedOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--keep-date-modified"];
+
+        public KeepDateModifiedOption()
+            : base(_aliases, Properties.Resources.CLI_Option_KeepDateModified)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/ProgressLinesOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class ProgressLinesOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--progress-lines", "--accessible"];
+
+        public ProgressLinesOption()
+            : base(_aliases, "Use line-based progress output for screen reader accessibility (milestones: 0%, 25%, 50%, 75%, 100%)")
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/QualityOption.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class QualityOption : Option<int?>
+    {
+        private static readonly string[] _aliases = ["--quality", "-q"];
+
+        public QualityOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Quality)
+        {
+            AddValidator(result =>
+            {
+                var value = result.GetValueOrDefault<int?>();
+                if (value.HasValue && (value.Value < 1 || value.Value > 100))
+                {
+                    result.ErrorMessage = "JPEG quality must be between 1 and 100.";
+                }
+            });
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/RemoveMetadataOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class RemoveMetadataOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--remove-metadata"];
+
+        public RemoveMetadataOption()
+            : base(_aliases, Properties.Resources.CLI_Option_RemoveMetadata)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/ReplaceOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class ReplaceOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--replace", "-r"];
+
+        public ReplaceOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Replace)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/ShowConfigOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class ShowConfigOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--show-config", "--config"];
+
+        public ShowConfigOption()
+            : base(_aliases, Properties.Resources.CLI_Option_ShowConfig)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/ShrinkOnlyOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class ShrinkOnlyOption : Option<bool>
+    {
+        private static readonly string[] _aliases = ["--shrink-only"];
+
+        public ShrinkOnlyOption()
+            : base(_aliases, Properties.Resources.CLI_Option_ShrinkOnly)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/SizeOption.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class SizeOption : Option<int?>
+    {
+        private static readonly string[] _aliases = ["--size"];
+
+        public SizeOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Size)
+        {
+            AddValidator(result =>
+            {
+                var value = result.GetValueOrDefault<int?>();
+                if (value.HasValue && value.Value < 0)
+                {
+                    result.ErrorMessage = "Size index must be a non-negative integer.";
+                }
+            });
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/UnitOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class UnitOption : Option<ImageResizer.Models.ResizeUnit?>
+    {
+        private static readonly string[] _aliases = ["--unit", "-u"];
+
+        public UnitOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Unit)
+        {
+        }
+    }
+}

src/modules/imageresizer/ui/Cli/Options/WidthOption.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.CommandLine;
+
+namespace ImageResizer.Cli.Options
+{
+    public sealed class WidthOption : Option<double?>
+    {
+        private static readonly string[] _aliases = ["--width", "-w"];
+
+        public WidthOption()
+            : base(_aliases, Properties.Resources.CLI_Option_Width)
+        {
+        }
+    }
+}