如何在c#中创建16位灰度PNG

本文关键字:16位 灰度 PNG 创建 | 更新日期: 2023-09-27 18:11:29

我正在尝试为城市:天际线生成一个高度图,它将它们导入为16位灰度png。

我用PixelFormat.Format16bppGrayScale创建了一个Bitmap,但试图通过Bitmap.Save保存它,传入I mageFormat.Png,导致ExternalException

"附加信息:GDI+中出现一般性错误。"

此外,从这些16位灰度PNG文件中的一个加载Bitmap,将文件打开为Format32bppArgb,我假设无声地删除一半数据。

如何在。net/c#中使用16位灰度PNG图像?

如何在c#中创建16位灰度PNG

更新: magic。. NET-Q16-AnyCPU已迁移到https://github.com/dlemstra/Magick.NET.

Magick的NuGet包。NET-Q16-AnyCPU https://magick.codeplex.com/工作完美。下面是我的代码:

namespace heightmap_generator {
internal class Program {
    private static int GRID_SIZE = 1081;
    private static void Main(string[] args) {
        using (MagickImage image = new MagickImage(@"C:'Users'Brent'AppData'Local'Colossal Order'Cities_Skylines'Addons'MapEditor'Heightmaps'benchmark.png")) {
            image.Draw(
                new DrawableFillColor(new MagickColor(ushort.MaxValue / 2, ushort.MaxValue / 2, ushort.MaxValue / 2)),
                new DrawableRectangle(0, 0, GRID_SIZE, GRID_SIZE)
            );
            var drawables = new List<IDrawable>();
            for (var y = 0; y < GRID_SIZE/50;  ++y) {
                float t = y / (GRID_SIZE / 50.0f);
                t = t*t*(3 - 2*t); //cubic hermite spline h01
                ushort v = (ushort)(ushort.MaxValue * (5 + (t-1)*0.3) / 10);
                if (y == GRID_SIZE/50 - 1) {
                    v = (ushort) (ushort.MaxValue*0.501);
                }
                drawables.Add(new DrawableFillColor(new MagickColor(v, v, v)));
                for (var x = 0; x < GRID_SIZE; ++x) {
                    if (x == GRID_SIZE/2) {
                        var v2 = (ushort) (v + ushort.MaxValue/1024);
                        drawables.Add(new DrawableFillColor(new MagickColor(v2, v2, v2)));
                        drawables.Add(new DrawableColor(x, GRID_SIZE/2 - y, PaintMethod.Point));
                        drawables.Add(new DrawableColor(x, GRID_SIZE/2 + y, PaintMethod.Point));
                        drawables.Add(new DrawableFillColor(new MagickColor(v, v, v)));
                    } else {
                        drawables.Add(new DrawableColor(x, GRID_SIZE/2 - y, PaintMethod.Point));
                        drawables.Add(new DrawableColor(x, GRID_SIZE/2 + y, PaintMethod.Point));
                    }
                }
            }
            image.Draw(drawables);
            image.Write(new FileStream(@"C:'Users'Brent'AppData'Local'Colossal Order'Cities_Skylines'Addons'MapEditor'Heightmaps'benchmark3.png", FileMode.Create));
        }
    }
}

}