Skip to content

Commit 0fcd04f

Browse files
flytkglflytkgl
committed
修改图片透明度的实现方式以支持合并模式的透明,更新O2S版本以支持PNG图片
1 parent 5880745 commit 0fcd04f

File tree

5 files changed

+44
-15
lines changed

5 files changed

+44
-15
lines changed

‎PDFQFZ/Form1.Designer.cs‎

Lines changed: 1 addition & 1 deletion
Some generated files are not rendered by default. Learn more about customizing how changed files appear on GitHub.

‎PDFQFZ/Form1.cs‎

Lines changed: 42 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -175,6 +175,10 @@ private void pdfGz()
175175
{
176176
imgYz = RotateImg(imgYz, rotation);
177177
}
178+
if (opacity < 100)
179+
{
180+
imgYz = SetImageOpacity(imgYz, opacity);
181+
}
178182

179183
//目录模式还是文件模式
180184
if (wjType == 0)
@@ -237,7 +241,32 @@ private void pdfGz()
237241
MessageBox.Show(ex.ToString());
238242
}
239243
}
244+
//设置图片透明度
245+
private Bitmap SetImageOpacity(Image srcImage, int opacity)
246+
{
247+
opacity = opacity * 255/100;
248+
Bitmap pic = new Bitmap(srcImage);
249+
for (int w = 0; w < pic.Width; w++)
250+
{
251+
for (int h = 0; h < pic.Height; h++)
252+
{
253+
Color c = pic.GetPixel(w, h);
254+
Color newC;
255+
if (!c.Equals(Color.FromArgb(0, 0, 0, 0)))
256+
{
257+
newC = Color.FromArgb(opacity, c);
258+
}
259+
else
260+
{
261+
newC = c;
262+
}
263+
pic.SetPixel(w, h, newC);
264+
}
265+
}
240266

267+
return pic;
268+
}
269+
//旋转图片
241270
public Bitmap RotateImg(Image b, int angle)
242271
{
243272
angle = angle % 360;
@@ -306,8 +335,8 @@ private bool PDFWatermark(string inputfilepath, string outputfilepath)
306335
float picbl = 1.003f;//别问我这个数值怎么来的
307336
float picmm = 2.842f;//别问我这个数值怎么来的
308337

309-
PdfGState state = new PdfGState();
310-
state.FillOpacity = 0.01f*opacity;//印章图片不透明度
338+
//PdfGState state = new PdfGState();
339+
//state.FillOpacity = 0.01f*opacity;//印章图片不透明度
311340

312341
//throw new NotImplementedException();
313342
PdfReader pdfReader = null;
@@ -353,10 +382,10 @@ private bool PDFWatermark(string inputfilepath, string outputfilepath)
353382
waterMarkContent = pdfStamper.GetOverContent(page);//获取当前页内容
354383
int rotation = pdfReader.GetPageRotation(page);//获取当前页的旋转度
355384
iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(page);//获取当前页尺寸
356-
iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(nImage[x - 1], System.Drawing.Imaging.ImageFormat.Bmp);//获取骑缝章对应页的部分
357-
image.Transparency = new int[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };//这里透明背景的图片会变黑色,所以设置黑色为透明
358-
waterMarkContent.SaveState();//通过PdfGState调整图片整体的透明度
359-
waterMarkContent.SetGState(state);
385+
iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(nImage[x - 1], System.Drawing.Imaging.ImageFormat.Png);//获取骑缝章对应页的部分
386+
//image.Transparency = new int[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };//这里透明背景的图片会变黑色,所以设置黑色为透明
387+
//waterMarkContent.SaveState();//通过PdfGState调整图片整体的透明度
388+
//waterMarkContent.SetGState(state);
360389
//image.GrayFill = 20;//透明度，灰色填充
361390
//image.Rotation//旋转
362391
//image.ScaleToFit(140F, 320F);//设置图片的指定大小
@@ -398,7 +427,7 @@ private bool PDFWatermark(string inputfilepath, string outputfilepath)
398427
}
399428
image.SetAbsolutePosition(xPos,yPos);
400429
waterMarkContent.AddImage(image);
401-
waterMarkContent.RestoreState();
430+
//waterMarkContent.RestoreState();
402431
}
403432
startpage += tmp;
404433
}
@@ -414,8 +443,8 @@ private bool PDFWatermark(string inputfilepath, string outputfilepath)
414443

415444
if (yzType != 0)
416445
{
417-
img = iTextSharp.text.Image.GetInstance(imgYz, System.Drawing.Imaging.ImageFormat.Bmp);//创建一个图片对象
418-
img.Transparency = new int[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };//这里透明背景的图片会变黑色,所以设置黑色为透明
446+
img = iTextSharp.text.Image.GetInstance(imgYz, System.Drawing.Imaging.ImageFormat.Png);//创建一个图片对象
447+
//img.Transparency = new int[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };//这里透明背景的图片会变黑色,所以设置黑色为透明
419448
//img.RotationDegrees = rotation;
420449

421450
if (sizeType == 0)
@@ -466,8 +495,8 @@ private bool PDFWatermark(string inputfilepath, string outputfilepath)
466495
int rotation = pdfReader.GetPageRotation(i);//获取指定页面的旋转度
467496
iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(i);//获取当前页尺寸
468497

469-
waterMarkContent.SaveState();//通过PdfGState调整图片整体的透明度
470-
waterMarkContent.SetGState(state);
498+
//waterMarkContent.SaveState();//通过PdfGState调整图片整体的透明度
499+
//waterMarkContent.SetGState(state);
471500

472501
float wbl = 0;
473502
float hbl = 1;
@@ -499,7 +528,7 @@ private bool PDFWatermark(string inputfilepath, string outputfilepath)
499528
}
500529
img.SetAbsolutePosition(xPos, yPos);
501530
waterMarkContent.AddImage(img);
502-
waterMarkContent.RestoreState();
531+
//waterMarkContent.RestoreState();
503532

504533
//普通印章跟数字印章已经完美重叠,所以就不需要通过以下方法特殊区分了
505534
//同时启用印章和数字签名的话用最后一个印章用数字签名代替
@@ -680,7 +709,7 @@ public void PDFToiPDF(string pdfPath)
680709
{
681710
Bitmap pageImage = pdfFile.GetPageImage(i, dpi);
682711
bitmaps[i] = pageImage;
683-
// pageImage.Save("D:\\tmp\\img\\" + i + ".png", System.Drawing.Imaging.ImageFormat.Png);
712+
pageImage.Save("D:\\tmp\\img\\" + i + ".png", System.Drawing.Imaging.ImageFormat.Png);
684713
}
685714
pdfFile.Dispose();
686715

‎PDFQFZ/PDFQFZ.csproj‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -95,8 +95,8 @@
9595
</Compile>
9696
<Compile Include="Program.cs" />
9797
<Compile Include="Properties\AssemblyInfo.cs" />
98-
<None Include="Resources\itextsharp.dll" />
9998
<None Include="Resources\O2S.Components.PDFRender4NET.dll" />
99+
<None Include="Resources\itextsharp.dll" />
100100
<EmbeddedResource Include="Form1.resx">
101101
<DependentUpon>Form1.cs</DependentUpon>
102102
<SubType>Designer</SubType>

‎PDFQFZ/Resources/O2S.Components.PDFRender4NET.dll‎

216 KB
Binary file not shown.

‎pdfqfz.jpg‎

371 Bytes
Loading

0 commit comments

Comments
 (0)