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添加颜色转换代码
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‎src/MediaConverters/MediaConverters.Lib/Imaging/Effect/Color/ColorMatrices.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Numerics;
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using System.Text;
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using System.Threading.Tasks;
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using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.PixelFormats;
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using ColorMatrix = DotNetCampus.MediaConverters.Imaging.Effect.Color.ColorMatrix5x5;
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namespace DotNetCampus.MediaConverters.Imaging.Effect.Color;
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/// <summary>
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/// 颜色转换矩阵
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/// </summary>
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public static class ColorMatrices
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{
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/// <summary>
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/// 在图像上执行颜色矩阵的应用。
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/// </summary>
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/// <param name="color">颜色</param>
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/// <param name="m">颜色处理矩阵.</param>
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/// <returns>处理后的颜色</returns>
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public static ColorMetadata ApplyMatrix(ColorMetadata color, in ColorMatrix5x5 m)
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{
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// 应用颜色转换矩阵将RGB颜色转换为新颜色
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var r = color.ARGB.Item1;
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var g = color.ARGB.Item2;
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var b = color.ARGB.Item3;
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var a = color.ARGB.Item4;
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var w = 1.0f;
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Span<float> newColor =
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[
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(m.Matrix00 * r) + (m.Matrix10 * g) + (m.Matrix20 * b) + (m.Matrix30 * a) + (m.Matrix40 * w),
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(m.Matrix01 * r) + (m.Matrix11 * g) + (m.Matrix21 * b) + (m.Matrix31 * a) + (m.Matrix41 * w),
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(m.Matrix02 * r) + (m.Matrix12 * g) + (m.Matrix22 * b) + (m.Matrix32 * a) + (m.Matrix42 * w),
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(m.Matrix03 * r) + (m.Matrix13 * g) + (m.Matrix23 * b) + (m.Matrix33 * a) + (m.Matrix43 * w),
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(m.Matrix04 * r) + (m.Matrix14 * g) + (m.Matrix24 * b) + (m.Matrix34 * a) + (m.Matrix44 * w)
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];
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if (newColor[0] < 0) newColor[0] = 0;
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if (newColor[0] > 1) newColor[0] = 1;
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if (newColor[1] < 0) newColor[1] = 0;
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if (newColor[1] > 1) newColor[1] = 1;
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if (newColor[2] < 0) newColor[2] = 0;
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if (newColor[2] > 1) newColor[2] = 1;
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if (newColor[3] < 0) newColor[3] = 0;
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if (newColor[3] > 1) newColor[3] = 1;
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if (newColor[4] < 0) newColor[4] = 0;
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if (newColor[4] > 1) newColor[4] = 1;
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return new ColorMetadata(newColor[0], newColor[1], newColor[2], newColor[3]);
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}
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/// <summary>
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/// 使用给定的数量创建亮度过滤器矩阵。
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/// <para>
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/// 使用算法<see href="https://cs.chromium.org/chromium/src/cc/paint/render_surface_filters.cc"/>
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/// </para>
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/// </summary>
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/// <remarks>
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/// 值为 0 将创建一个完全黑色的图像。值为 1 时输入保持不变。
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/// 其他值是效果的线性乘数。允许超过 1 的值，从而提供更明亮的结果。
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/// </remarks>
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/// <param name="amount">转化比例，必须大于或等于 0。</param>
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/// <returns>The <see cref="ColorMatrix"/>.</returns>
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public static ColorMatrix CreateBrightnessFilter(float amount)
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{
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if (amount < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(amount), "Threshold must be >= 0");
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}
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return new ColorMatrix
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{
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Matrix00 = amount,
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Matrix11 = amount,
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Matrix22 = amount,
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Matrix33 = 1F
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};
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}
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/// <summary>
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/// 使用给定的数量创建灰度滤波器矩阵。
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/// <para>
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/// 使用算法<see href="https://en.wikipedia.org/wiki/Luma_%28video%29#Rec._601_luma_versus_Rec._709_luma_coefficients"/>
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/// </para>
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/// </summary>
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/// <param name="amount">转化比例，必须大于或等于 0 小于等于 1。</param>amount
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/// <returns>The <see cref="ColorMatrix"/>.</returns>
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public static ColorMatrix CreateGrayScaleFilter(float amount)
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{
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if (amount < 0 || amount > 1)
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{
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throw new ArgumentOutOfRangeException(
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nameof(amount),
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"Threshold must be in range 0..1");
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}
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amount = 1F - amount;
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var matrix = new ColorMatrix
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{
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Matrix00 = .299F + (.701F * amount),
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Matrix10 = .587F - (.587F * amount),
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Matrix01 = .299F - (.299F * amount),
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Matrix11 = .587F + (.2848F * amount),
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Matrix02 = .299F - (.299F * amount),
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Matrix12 = .587F - (.587F * amount),
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Matrix33 = 1F
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};
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matrix = matrix with
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{
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Matrix20 = 1F - (matrix.Matrix00 + matrix.Matrix10),
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Matrix21 = 1F - (matrix.Matrix01 + matrix.Matrix11),
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Matrix22 = 1F - (matrix.Matrix02 + matrix.Matrix12),
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};
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return matrix;
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}
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/// <summary>
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/// 使用给定的数量创建对比度过滤器矩阵。
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/// <para>
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/// 使用算法<see href="https://cs.chromium.org/chromium/src/cc/paint/render_surface_filters.cc"/>
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/// </para>
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/// </summary>
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/// <remarks>
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/// 值为 0 将创建一个完全灰色的图像。值为 1 时输入保持不变。
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/// 其他值是效果的线性乘数。允许超过 1 的值，从而提供具有更高对比度的结果。
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/// </remarks>
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/// <param name="amount">转化比例，必须大于或等于 0。</param>
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/// <returns>The <see cref="ColorMatrix"/>.</returns>
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public static ColorMatrix CreateContrastFilter(float amount)
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{
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if (amount < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(amount), "Threshold must be >= 0");
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}
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var contrast = (-.5F * amount) + .5F;
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return new ColorMatrix
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{
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Matrix00 = amount,
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Matrix11 = amount,
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Matrix22 = amount,
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Matrix33 = 1F,
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Matrix40 = contrast,
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Matrix41 = contrast,
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Matrix42 = contrast
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};
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}
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/// <summary>
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/// 使用给定的数量创建饱和度过滤器矩阵。
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/// <para>
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/// 使用算法<see href="https://cs.chromium.org/chromium/src/cc/paint/render_surface_filters.cc"/>
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/// </para>
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/// </summary>
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/// <remarks>
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/// 0 值是完全不饱和的。值为 1 时输入保持不变。
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/// 其他值是效果的线性乘数。允许超过 1 的值，提供超饱和结果。
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/// </remarks>
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/// <param name="amount">转化比例，必须大于或等于 0。</param>
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/// <returns>The <see cref="ColorMatrix"/>.</returns>
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public static ColorMatrix CreateSaturationFilter(float amount)
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{
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if (amount < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(amount), "Threshold must be >= 0");
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}
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var matrix = new ColorMatrix
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{
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Matrix00 = .213F + (.787F * amount),
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Matrix10 = .715F - (.715F * amount),
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Matrix01 = .213F - (.213F * amount),
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Matrix11 = .715F + (.285F * amount),
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Matrix02 = .213F - (.213F * amount),
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Matrix12 = .715F - (.715F * amount),
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Matrix33 = 1F
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};
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matrix = matrix with
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{
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Matrix20 = 1F - (matrix.Matrix00 + matrix.Matrix10),
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Matrix21 = 1F - (matrix.Matrix01 + matrix.Matrix11),
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Matrix22 = 1F - (matrix.Matrix02 + matrix.Matrix12),
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};
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return matrix;
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}
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}

‎src/MediaConverters/MediaConverters.Lib/Imaging/Effect/Color/ColorMatrix5x5.cs‎

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namespace DotNetCampus.MediaConverters.Imaging.Effect.Color;
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// ReSharper disable once InconsistentNaming
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public readonly record struct ColorMatrix5x5()
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{
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public float Matrix00 { get; init; } = 1.0f;
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public float Matrix01 { get; init; } = 0.0f;
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public float Matrix02 { get; init; } = 0.0f;
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public float Matrix03 { get; init; } = 0.0f;
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public float Matrix04 { get; init; } = 0.0f;
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public float Matrix10 { get; init; } = 0.0f;
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public float Matrix11 { get; init; } = 1.0f;
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public float Matrix12 { get; init; } = 0.0f;
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public float Matrix13 { get; init; } = 0.0f;
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public float Matrix14 { get; init; } = 0.0f;
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public float Matrix20 { get; init; } = 0.0f;
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public float Matrix21 { get; init; } = 0.0f;
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public float Matrix22 { get; init; } = 1.0f;
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public float Matrix23 { get; init; } = 0.0f;
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public float Matrix24 { get; init; } = 0.0f;
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public float Matrix30 { get; init; } = 0.0f;
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public float Matrix31 { get; init; } = 0.0f;
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public float Matrix32 { get; init; } = 0.0f;
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public float Matrix33 { get; init; } = 1.0f;
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public float Matrix34 { get; init; } = 0.0f;
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public float Matrix40 { get; init; } = 0.0f;
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public float Matrix41 { get; init; } = 0.0f;
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public float Matrix42 { get; init; } = 0.0f;
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public float Matrix43 { get; init; } = 0.0f;
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public float Matrix44 { get; init; } = 1.0f;
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}

‎src/MediaConverters/MediaConverters.Lib/Imaging/Effect/Color/ColorMetadata.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using SixLabors.ImageSharp.PixelFormats;
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namespace DotNetCampus.MediaConverters.Imaging.Effect.Color;
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public readonly struct ColorMetadata
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{
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public ColorMetadata(Rgba32 color)
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{
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Color = color;
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ARGB = (color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
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}
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/// <summary>
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/// 使用RGB数据进行构造
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/// </summary>
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/// <param name="r"></param>
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/// <param name="g"></param>
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/// <param name="b"></param>
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/// <param name="a"></param>
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public ColorMetadata(float r, float g, float b, float a = 1)
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{
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ARGB = (r, g, b, a);
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Color = new Rgba32(To8BitValue(r), To8BitValue(g), To8BitValue(b), To8BitValue(a));
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static byte To8BitValue(float value)
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{
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if (value < 0)
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{
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return 0;
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}
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else if (value >= 1)
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{
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return byte.MaxValue;
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}
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return (byte) Math.Min(Math.Round(value * byte.MaxValue), byte.MaxValue);
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}
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}
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public Rgba32 Color { get; init; }
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/// <summary>
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/// RGB模式的红色、绿色、蓝色、透明度通道值[范围0-1]
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/// 注意Alpha通道是最后一个值
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/// </summary>
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public (float R, float G, float B, float A) ARGB { get; }
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/// <summary>
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/// RGB模式的红色、绿色、蓝色通道值[范围0-1]
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/// </summary>
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public (float R, float G, float B) RGB => (ARGB.R, ARGB.G, ARGB.B);
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/// <summary>
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/// RGB模式的红色、绿色、蓝色、透明度通道值[范围0-255]
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/// 注意Alpha通道是最后一个值
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/// </summary>
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public (byte R, byte G, byte B, byte A) ARGB8bit => (Color.R, Color.G, Color.B, Color.A);
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/// <summary>
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/// 获取颜色的灰度值
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/// </summary>
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/// <returns></returns>
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public float GetGrayScale()
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{
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var r = ARGB.R;
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var g = ARGB.G;
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var b = ARGB.B;
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return 0.30f * r + 0.59f * g + 0.11f * b;
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}
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}

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