Resolution

ImageSaveOptions.Resolution property

设置生成图像的水平和垂直分辨率（以每英寸点数为单位）。

public float Resolution { set; }

评论

此属性仅在保存为光栅图像格式时有效。

例子

演示如何在将文档渲染为 PNG 时指定分辨率。

Document doc = new Document();
            DocumentBuilder builder = new DocumentBuilder(doc);

            builder.Font.Name = "Times New Roman";
            builder.Font.Size = 24;
            builder.Writeln("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.");

            builder.InsertImage(ImageDir + "Logo.jpg");

            // 创建一个“ImageSaveOptions”对象，我们可以将其传递给文档的“Save”方法
            // 修改该方法将文档呈现为图像的方式。
            ImageSaveOptions options = new ImageSaveOptions(SaveFormat.Png);

            // 将“Resolution”属性设置为“72”，以 72dpi 渲染文档。
            options.Resolution = 72;

            doc.Save(ArtifactsDir + "ImageSaveOptions.Resolution.72dpi.png", options);

            Assert.That(120000, Is.AtLeast(new FileInfo(ArtifactsDir + "ImageSaveOptions.Resolution.72dpi.png").Length));

#if NET48 || JAVA
            Image image = Image.FromFile(ArtifactsDir + "ImageSaveOptions.Resolution.72dpi.png");

            Assert.AreEqual(612, image.Width);
            Assert.AreEqual(792, image.Height);
#elif NET5_0_OR_GREATER || __MOBILE__
            using (SKBitmap image = SKBitmap.Decode(ArtifactsDir + "ImageSaveOptions.Resolution.72dpi.png")) 
            {
                Assert.AreEqual(612, image.Width);
                Assert.AreEqual(792, image.Height);
            }
#endif
            // 将“Resolution”属性设置为“300”，以 300dpi 渲染文档。
            options.Resolution = 300;

            doc.Save(ArtifactsDir + "ImageSaveOptions.Resolution.300dpi.png", options);

            Assert.That(700000, Is.LessThan(new FileInfo(ArtifactsDir + "ImageSaveOptions.Resolution.300dpi.png").Length));

#if NET48 || JAVA
            image = Image.FromFile(ArtifactsDir + "ImageSaveOptions.Resolution.300dpi.png");

            Assert.AreEqual(2550, image.Width);
            Assert.AreEqual(3300, image.Height);
#elif NET5_0_OR_GREATER || __MOBILE__
            using (SKBitmap image = SKBitmap.Decode(ArtifactsDir + "ImageSaveOptions.Resolution.300dpi.png")) 
            {
                Assert.AreEqual(2550, image.Width);
                Assert.AreEqual(3300, image.Height);
            }
#endif

也可以看看

ImageSaveOptions.PixelFormat ImageSaveOptions.SaveFormat