免费的网站申请,口腔建立网站,wordpress alipay插件,easyui 网站开发实现使用 C# 控制台应用程序示例在 Windows、Linux 和 MacOS 机器上处理图像#xff0c;包括创建散点图和直方图#xff0c;以及根据需要旋转图像以便正确显示。 这个小型实用程序库需要将 NuGet SixLabors.ImageSharp包#xff08;版本 1.0.4#xff09;添加到.NET Core 3.1/ …
使用 C# 控制台应用程序示例在 Windows、Linux 和 MacOS 机器上处理图像包括创建散点图和直方图以及根据需要旋转图像以便正确显示。 这个小型实用程序库需要将 NuGet SixLabors.ImageSharp包版本 1.0.4添加到.NET Core 3.1/ .NET 6 / .NET 8项目中。它与Windows、Linux和 MacOS兼容。
这已针对ImageSharp v3.0.1 进行了重新设计。
它可以根据百万像素数或长度乘以宽度来调整图像大小并根据需要保留纵横比。
它根据EXIF数据旋转/翻转图像。这是为了适应移动设备。
它还创建散点图和直方图。
using SixLabors.ImageSharp; using SixLabors.ImageSharp.Metadata.Profiles.Exif; using SixLabors.ImageSharp.Processing; using SixLabors.ImageSharp.PixelFormats; using SixLabors.ImageSharp.Formats.Png; using System.IO; using System; using SixLabors.ImageSharp.Formats.Jpeg;
namespace ImageUtil { public class GetSize { public GetSize(Stream stream) { using (Image iOriginal Image.Load(stream)) { stream.Position 0; Width iOriginal.Width; Height iOriginal.Height; } } /// summary /// The width of the image specified in the class constructors Stream parameter /// /summary public int Width { get; } /// summary /// The height of the image specified in the class constructors Stream parameter /// /summary public int Height { get; } } public static class Resize { /// summary /// Resize and save an image to a Stream specifying its new width and height /// /summary public static void SaveImage(Stream imageStream, int newWidth, int newHeight, bool preserveImageRatio, Stream saveToStream, int jpegQuality 100) { using (Image iOriginal Image.Load(imageStream)) { imageStream.Position 0; if (preserveImageRatio) { float percentWidth newWidth / (float)iOriginal.Width; float percentHeight newHeight / (float)iOriginal.Height; float percent percentHeight percentWidth ? percentHeight : percentWidth; newWidth (int)Math.Round(iOriginal.Width * percent, 0); newHeight (int)Math.Round(iOriginal.Height * percent, 0); } resize(imageStream, iOriginal, newWidth, newHeight, saveToStream, jpegQuality); } } /// summary /// Resize and save an image to a Stream specifying the number of pixels to resize to /// /summary public static void SaveImage(Stream imageStream, int newNumberOfPixels, Stream saveToStream, int jpegQuality 100) { using (Image iOriginal Image.Load(imageStream)) { imageStream.Position 0; double ratio Math.Sqrt(newNumberOfPixels / (double)(iOriginal.Width * iOriginal.Height)); resize(imageStream, iOriginal, (int)Math.Round(iOriginal.Width * ratio, 0), (int)Math.Round(iOriginal.Height * ratio, 0), saveToStream, jpegQuality); } } private static void resize(Stream origSource, Image image, int newWidth, int newHeight, Stream saveTo, int jpegQuality) { image.Mutate(x x.Resize(newWidth, newHeight)); transformImage(image); // NOTE: transform image AFTER resizing it!!! var format Image.DetectFormat(origSource); if (format.Name.ToLower() jpeg) { var encoder new JpegEncoder(); encoder.Quality jpegQuality; image.SaveAsJpeg(saveTo, encoder); } else image.Save(saveTo, format); } private static void transformImage(Image image) { IExifValue exifOrientation image.Metadata?.ExifProfile?.GetValue(ExifTag.Orientation); if (exifOrientation null) return; RotateMode rotateMode; FlipMode flipMode; setRotateFlipMode(exifOrientation, out rotateMode, out flipMode); image.Mutate(x x.RotateFlip(rotateMode, flipMode)); image.Metadata.ExifProfile.SetValue(ExifTag.Orientation, (ushort)1); } private static void setRotateFlipMode(IExifValue exifOrientation, out RotateMode rotateMode, out FlipMode flipMode) { var orientation (ushort)exifOrientation.GetValue(); switch (orientation) { case 2: rotateMode RotateMode.None; flipMode FlipMode.Horizontal; break; case 3: rotateMode RotateMode.Rotate180; flipMode FlipMode.None; break; case 4: rotateMode RotateMode.Rotate180; flipMode FlipMode.Horizontal; break; case 5: rotateMode RotateMode.Rotate90; flipMode FlipMode.Horizontal; break; case 6: rotateMode RotateMode.Rotate90; flipMode FlipMode.None; break; case 7: rotateMode RotateMode.Rotate90; flipMode FlipMode.Vertical; break; case 8: rotateMode RotateMode.Rotate270; flipMode FlipMode.None; break; default: rotateMode RotateMode.None; flipMode FlipMode.None; break; } } } /* CREATE A SCATTER PLOT JPEG/PNG IMAGE */ public static class ScatterPlot { static readonly Rgba32 WHITE new Rgba32(255, 255, 255); static readonly Rgba32 BLACK new Rgba32(0, 0, 0); static readonly Rgba32 RED new Rgba32(255, 0, 0); static readonly Rgba32 BLUE new Rgba32(0, 0, 255); static readonly Rgba32 GREEN new Rgba32(0, 192, 0); static readonly Rgba32 PURPLE new Rgba32(128, 0, 128); static readonly Rgba32 ORANGE new Rgba32(255, 164, 0); static readonly Rgba32 YELLOW new Rgba32(255, 225, 0); static readonly Rgba32 MAGENTA new Rgba32(255, 0, 255); static readonly Rgba32 AQUA new Rgba32(0, 225, 255); static readonly Rgba32 BLUEJEAN new Rgba32(0, 128, 255); static readonly Rgba32 BROWN new Rgba32(150, 75, 50); static readonly Rgba32 CHARTREUSE new Rgba32(223, 255, 0); static readonly Rgba32 DODGERBLUE new Rgba32(30, 144, 255); static readonly Rgba32 NAVY new Rgba32(0, 0, 128); static readonly Rgba32 DARKRED new Rgba32(139, 0, 0); static readonly Rgba32[] colors new Rgba32[] { WHITE, BLACK, RED, BLUE, GREEN, PURPLE, ORANGE, YELLOW, MAGENTA, AQUA, BLUEJEAN, BROWN, DODGERBLUE, CHARTREUSE, NAVY, DARKRED }; public static void CreateJPEG(Stream stream, ScatterPlotColors backgroundColor, IEnumerablePlotPoint points, int width, int height, int pointSize, int jpegQuality 100) { using (var bmp new ImageRgba32(width / pointSize 6, height / pointSize 6, colors[(int)backgroundColor])) create(stream, width, height, bmp, points, pointSize, new JpegEncoder() { Quality jpegQuality }); } public static void CreateJPEG(string filename, ScatterPlotColors backgroundColor, IEnumerablePlotPoint points, int width, int height, int pointSize, int jpegQuality 100) { using (var stream File.Create(filename)) CreateJPEG(stream, backgroundColor, points, width, height, pointSize, jpegQuality); } public static void CreatePNG(Stream stream, IEnumerablePlotPoint points, int width, int height, int pointSize) { using (var bmp new ImageRgba32(width / pointSize 6, height / pointSize 6)) create(stream, width, height, bmp, points, pointSize, new PngEncoder()); } public static void CreatePNG(string filename, IEnumerablePlotPoint points, int width, int height, int pointSize) { using (var stream File.Create(filename)) CreatePNG(stream, points, width, height, pointSize); } private static double normalize(float min, float max, float value) { double x max - min; if(x 0) return 0; return (value - min) / x; } private static void create(Stream stream, int width, int height, ImageRgba32 bmp, IEnumerablePlotPoint points, int pointSize, SixLabors.ImageSharp.Formats.IImageEncoder imageEncoder) { float xMax float.MinValue, xMin float.MaxValue, yMax float.MinValue, yMin float.MaxValue; foreach (var pt in points) { xMax Math.Max(pt.x, xMax); xMin Math.Min(pt.x, xMin); yMax Math.Max(pt.y, yMax); yMin Math.Min(pt.y, yMin); } float xDelta Math.Max(1, xMax - xMin), yDelta Math.Max(1, yMax - yMin); int w width / pointSize; int h height / pointSize; foreach (var pt in points) { int x (int)(w * normalize(xMin, xMax, pt.x)); int y (int)(h * normalize(yMin, yMax, pt.y)); bmp[x 3, y 3] colors[((int)pt.color) % colors.Length]; } bmp.Mutate(x x.Flip(FlipMode.Vertical)); bmp.Mutate(x x.Resize(width, height)); bmp.Save(stream, imageEncoder); } } public class PlotPoint { public ScatterPlotColors color { get; } public float x { get; } public float y { get; } public PlotPoint(float x, float y, ScatterPlotColors color) { this.x x; this.y y; this.color color; } } public enum ScatterPlotColors { WHITE, BLACK, RED, BLUE, GREEN, PURPLE, ORANGE, YELLOW, MAGENTA, AQUA, BLUEJEAN, BROWN, CHARTREUSE, DODGERBLUE, NAVY, DARKRED } /* CREATE A PNG HISTOGRAM OF AN IMAGE */ public static class Histogram { /// summary /// Create a histogram from the data in a stream /// /summary public static MemoryStream CreatePNG(Stream stream, int width, int height, LRGB lrgb, byte alphaChannel 128, bool clipBlackAndWhite true, byte luminanceShade 255) { using (var bmp ImageRgb24.Load(stream)) { return create(bmp, width, height, lrgb, alphaChannel, clipBlackAndWhite, luminanceShade); } } /// summary /// Create a histogram from the data in a file /// /summary public static MemoryStream CreatePNG(string filename, int width, int height, LRGB lrgb, byte alphaChannel 128, bool clipBlackAndWhite true, byte luminanceShade 255) { using (var bmp ImageRgb24.Load(filename)) { return create(bmp, width, height, lrgb, alphaChannel, clipBlackAndWhite, luminanceShade); } } private static MemoryStream create(Image bmp, int width, int height, LRGB lrgb, byte alpha, bool clip, byte shade) { ulong[] lumin new ulong[256]; ulong[] red new ulong[256]; ulong[] green new ulong[256]; ulong[] blue new ulong[256]; var bred (lrgb LRGB.RED) ! 0; var bgreen (lrgb LRGB.GREEN) ! 0; var bblue (lrgb LRGB.BLUE) ! 0; var blumin (lrgb LRGB.LUMINANCE); int w bmp.Width; int h bmp.Height; var bmp2 bmp.CloneAsRgb24(); for (int y 0; y h; y) { SpanRgb24 pixelRow bmp2.GetPixelRowSpan(y); for (int x 0; x w; x) { var c pixelRow[x]; lumin[(int)Math.Round((c.R c.G c.B) / 3.0)]; red[c.R]; green[c.G]; blue[c.B]; } } ulong max 0; int a (clip ? 1 : 0), b (clip ? 255 : 256); for (int i a; i b; i) { if (!blumin) { if (bred) if (max red[i]) max red[i]; if (bgreen) if (max green[i]) max green[i]; if (bblue) if (max blue[i]) max blue[i]; } else if (max lumin[i]) max lumin[i]; } double HEIGHTFACTOR 256.0 / max; if (blumin) { using (var bmplum new ImageRgba32(256, 256)) { var penlum new VerticalPen(new Rgba32(shade, shade, shade, alpha)); for (int i 0; i 256; i) penlum.Draw(bmplum, i, (int)(lumin[i] * HEIGHTFACTOR)); bmplum.Mutate(x x.Resize(width, height)); MemoryStream ms new MemoryStream(); bmplum.Save(ms, new PngEncoder()); return ms; } } else { using (var bmppre new ImageRgba32(256, 256)) { ImageRgba32? bmpred null, bmpgreen null, bmpblue null; VerticalPen? penred null, pengreen null, penblue null; if (bred) { bmpred new ImageRgba32(256, 256); penred new VerticalPen(new Rgba32(255, 0, 0, alpha)); } if (bgreen) { bmpgreen new ImageRgba32(256, 256); pengreen new VerticalPen(new Rgba32(0, 255, 0, alpha)); } if (bblue) { bmpblue new ImageRgba32(256, 256); penblue new VerticalPen(new Rgba32(0, 0, 255, alpha)); } for (int i 0; i 256; i) { if (bred) penred.Draw(bmpred, i, (int)(red[i] * HEIGHTFACTOR)); if (bgreen) pengreen.Draw(bmpgreen, i, (int)(green[i] * HEIGHTFACTOR)); if (bblue) penblue.Draw(bmpblue, i, (int)(blue[i] * HEIGHTFACTOR)); } if (bred) { bmppre.Mutate(x x.DrawImage(bmpred, 1)); bmpred.Dispose(); } if (bgreen) { bmppre.Mutate(x x.DrawImage(bmpgreen, 1)); bmpgreen.Dispose(); } if (bblue) { bmppre.Mutate(x x.DrawImage(bmpblue, 1)); bmpblue.Dispose(); } bmppre.Mutate(x x.Resize(width, height)); MemoryStream ms new MemoryStream(); bmppre.Save(ms, new PngEncoder()); return ms; } } } internal class VerticalPen { private readonly Rgba32 color; public VerticalPen(Rgba32 color) { this.color color; } public void Draw(ImageRgba32 bmp, int row, int height) { if (height bmp.Height) for (int y height - 1; y 0; y--) bmp[row, bmp.Height - 1 - y] color; } } public enum LRGB { LUMINANCE 0, RED 1, GREEN 2, BLUE 4, REDBLUE 1 | 4, REDGREEN 1 | 2, BLUEGREEN 2 | 4, REDGREENBLUE 1 | 2 | 4 } } }
示例用法 另请参阅Web 应用程序示例 namespace ConsoleApp1 { class Program { static void Main(string[] args) { if(args.Length 0) { using (var openfs System.IO.File.OpenRead(args[0])) { // NOTE: GET IMAGE SIZE var size new ImageUtil.GetSize(openfs); System.Console.WriteLine(IMAGE SIZE: size.Width x size.Height); if (args.Length 1) { if (System.IO.File.Exists(args[1])) System.IO.File.Delete(args[1]); using (var savefs System.IO.File.OpenWrite(args[1])) { System.Console.WriteLine(RESIZING IMAGE TO 10K PIXEL THUMBNAIL); // NOTE: RESIZE IMAGE TO 10K PIXELS; THIS WILL ALSO FLIP AND ROTATE IMAGE AS NEEDED ImageUtil.Resize.SaveImage(openfs, 10000, savefs); } } } System.Console.WriteLine(CREATING LUMINANCE HISTOGRAM: histogram.png); // NOTE: CREATE HISTOGRAM WHICH IS RETURNED AS A MEMORY STREAM OF A PORTABLE NETWORK GRAPHICS (PNG) IMAGE FILE using (var histogram ImageUtil.Histogram.CreatePNG(args[0], 300, 150, ImageUtil.Histogram.LRGB.LUMINANCE, 128)) { if (System.IO.File.Exists(histogram.png)) System.IO.File.Delete(histogram.png); System.IO.File.WriteAllBytes(histogram.png, histogram.ToArray()); } } else System.Console.WriteLine(argument one is path to image, argument two [optional] is path to resized image); } } }
如果您喜欢此文章请收藏、点赞、评论谢谢祝您快乐每一天。
