61 lines
2.2 KiB
C#
61 lines
2.2 KiB
C#
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using System.IO;
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using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.Formats.Png;
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using SixLabors.ImageSharp.Metadata.Profiles.Exif;
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using SixLabors.ImageSharp.Processing;
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using ImageMagick;
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using UnityEngine;
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namespace HK.FUJIFILM
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{
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public static class PngCompressor
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{
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public static void CompressPng(string inputPath, string outputPath)
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{
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using (Image image = Image.Load(inputPath))
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{
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// 设置 DPI（如果你知道它是 300，可以手动设置）
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image.Metadata.VerticalResolution = 300;
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image.Metadata.HorizontalResolution = 300;
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// 保存为 PNG，并设置压缩选项
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var encoder = new PngEncoder
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{
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CompressionLevel = PngCompressionLevel.Level9, // 最高压缩，无损
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FilterMethod = PngFilterMethod.Adaptive, // 通常效果最好
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ColorType = PngColorType.Rgb // 保留 RGB，避免 Alpha 影响体积
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};
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image.Save(outputPath, encoder);
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}
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}
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/// <summary>
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/// 压缩 PNG 并设置为 300 DPI
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/// </summary>
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/// <param name="inputPath">原始 PNG 路径</param>
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/// <param name="outputPath">压缩后 PNG 输出路径</param>
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public static void CompressPngAndSetDpi(string inputPath, string outputPath)
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{
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using (var image = new MagickImage(inputPath))
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{
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// 设置 300 DPI
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image.Density = new Density(300, 300, DensityUnit.PixelsPerInch);
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// 设置压缩参数（对于 PNG 有效）
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image.Format = MagickFormat.Png;
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image.Quality = 100; // 保证无损
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image.Depth = 8; // PNG 8bit（通常足够）
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// 选择压缩过滤器
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image.Settings.SetDefine(MagickFormat.Png, "compression-filter", "5");
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image.Settings.Compression = CompressionMethod.Zip; // PNG 默认
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// 写入输出文件
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image.Write(outputPath);
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}
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Debug.Log($"✅ 压缩成功，输出文件: {outputPath}");
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}
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}
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}
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