diff --git a/App/Functions/DocumentInspector/ImageViewerForm.cs b/App/Functions/DocumentInspector/ImageViewerForm.cs
index 72d88f0..df29d88 100644
--- a/App/Functions/DocumentInspector/ImageViewerForm.cs
+++ b/App/Functions/DocumentInspector/ImageViewerForm.cs
@@ -18,13 +18,24 @@ namespace PDFPatcher.Functions
 				_ImageBox.Image = bmp.ToBitmap();
 			}
 			else {
+				FIBITMAP b = default;
 				try {
-					using FreeImageBitmap bmp = FreeImageHelper.CreateFromBytes(bytes);
-					_ImageBox.Image = bmp.ToBitmap();
+					var isCmyk = iTextSharp.text.pdf.PdfName.DEVICECMYK.Equals(image.ColorSpace);
+					using var ms = new System.IO.MemoryStream(bytes);
+					b = FreeImage.LoadFromStream(ms, isCmyk ? FREE_IMAGE_LOAD_FLAGS.TIFF_CMYK | FREE_IMAGE_LOAD_FLAGS.JPEG_CMYK : FREE_IMAGE_LOAD_FLAGS.DEFAULT);
+					if (isCmyk) {
+						b = ConvertCmykToRgb(b, image.InvertCmyk);
+					}
+					_ImageBox.Image = FreeImage.GetBitmap(b);
 				}
 				catch (System.Exception ex) {
 					this.ErrorBox("无法加载图片", ex);
 				}
+				finally {
+					if (!b.IsNull) {
+						FreeImage.Unload(b);
+					}
+				}
 			}
 		}
 
@@ -62,5 +73,73 @@ namespace PDFPatcher.Functions
 					break;
 			}
 		}
+
+		static FIBITMAP ConvertCmykToRgb(FIBITMAP cmykDib, bool invert) {
+			int width = (int)FreeImage.GetWidth(cmykDib);
+			int height = (int)FreeImage.GetHeight(cmykDib);
+
+			FIBITMAP rgbDib = FreeImage.Allocate(width, height, 24, 0, 0, 0);
+
+			FIBITMAP cChannel = FreeImage.GetChannel(cmykDib, FREE_IMAGE_COLOR_CHANNEL.FICC_BLUE);
+			FIBITMAP mChannel = FreeImage.GetChannel(cmykDib, FREE_IMAGE_COLOR_CHANNEL.FICC_GREEN);
+			FIBITMAP yChannel = FreeImage.GetChannel(cmykDib, FREE_IMAGE_COLOR_CHANNEL.FICC_RED);
+			FIBITMAP kChannel = FreeImage.GetChannel(cmykDib, FREE_IMAGE_COLOR_CHANNEL.FICC_ALPHA);
+
+			unsafe {
+				var cPtr = (byte*)FreeImage.GetBits(cChannel);
+				var mPtr = (byte*)FreeImage.GetBits(mChannel);
+				var yPtr = (byte*)FreeImage.GetBits(yChannel);
+				var kPtr = (byte*)FreeImage.GetBits(kChannel);
+				var rgbPtr = (byte*)FreeImage.GetBits(rgbDib);
+
+				var pitch = (int)FreeImage.GetPitch(rgbDib);
+
+				for (int y = 0; y < height; y++) {
+					int rowOffset = y * pitch;
+					int srcBaseIdx = y * width; // 假设通道也是连续的，无行填充（通常 FreeImage 通道如此）
+
+					for (int x = 0; x < width; x++) {
+						int srcIdx = srcBaseIdx + x;
+						int dstIdx = rowOffset + x * 3;
+
+						// 读取原始值
+						int c = cPtr[srcIdx];
+						int m = mPtr[srcIdx];
+						int yVal = yPtr[srcIdx];
+						int k = kPtr[srcIdx];
+
+						// 如果需要取反（之前的逻辑）
+						if (invert) {
+							c = 255 - c;
+							m = 255 - m;
+							yVal = 255 - yVal;
+							k = 255 - k;
+						}
+
+						// 计算红色: R = (255 - C) * (255 - K) / 255
+						int r_val = ((255 - c) * (255 - k)) / 255;
+
+						// 计算绿色: G = (255 - M) * (255 - K) / 255
+						int g_val = ((255 - m) * (255 - k)) / 255;
+
+						// 计算蓝色: B = (255 - Y) * (255 - K) / 255
+						int b_val = ((255 - yVal) * (255 - k)) / 255;
+
+						// 写入 RGB (BGR 顺序)
+						rgbPtr[dstIdx + 0] = (byte)b_val;
+						rgbPtr[dstIdx + 1] = (byte)g_val;
+						rgbPtr[dstIdx + 2] = (byte)r_val;
+					}
+				}
+			}
+
+			FreeImage.Unload(cChannel);
+			FreeImage.Unload(mChannel);
+			FreeImage.Unload(yChannel);
+			FreeImage.Unload(kChannel);
+			FreeImage.Unload(cmykDib);
+
+			return rgbDib;
+		}
 	}
 }