Transparent Handwritten Signatures

参考：Handwritten Signatures in MS Word

1. Take a white A4 paper and put your signature on it using a nice, thick pen.
2. Scan it at 300 DPI (grey-scale is fine, too).
3. Crop out everything but the signature. This can usually be done in the scanner program itself if you do a pre-scan. But you can also do it with MS Paint.
4. Save it as JPG.
5. Open Inkscape.
6. Drag and drop your scanned JPG into Inkscape.
7. Select the image in Inkscape and choose Path -> Trace Bitmap from the menu.
8. Use “Brightness Cutoff” with a high threshold (over 0.9) and press Ok.
9. It will create a vector version of the signature and place it directly above the image. Drag it away to see the difference between the two.
10. Feel free to play with the threshold until you get a good reproduction of the original image.
11. Now select the original image and delete it (DEL).
12. Select the good vector version and do File -> Document Properties -> Fit page to selection.
13. Now save as EMF.
14. You can now drag and drop this EMF into Word. Make sure the Text Wrap property of the image in Word is set to “In Front of Text” and then just place it over the signature space.

  ——Handwritten Signatures in MS Word

Inkscape是跨平台的自由软件，很多方面可以替代PhotoShop。我们将用Inkscape制作签名图片的透明背景矢量图，并插入到PDF中。步骤如下：

1. 在白纸上签名并拍照，可以用“扫描全能王”等手机扫描软件进行增强锐化处理。
2. 将照片传到电脑，用Inkscape制作透明背景矢量签名。保存成pdf格式以便导入pdf。
3. 使用福昕阅读器的图章功能，制作图章。