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This FREE PDF Tool can create a transparent image with options to adjust one color and the left colors' transparency.  This is useful when you need to make a transparent PDF signature stamps from your Image file (PNG, JPG, BMP, TIF, GIF).

Here are the steps on how to create a transparent image:

1. Choose  Free PDF Tools > Create Transparent Image

2. Select an image (PNG, JPG, BMP, TIF, GIF) that you want to change the transparency.

3. The Transparency Properties selection dialog box comes up:

 

• Select a Color and its transparency.
• Single Color Selection Tolerance.
• Select the transparency for the other colors.

4. Click OK to have a new PNG file. 

5. Do experiment with the options available to see which best suit your needs.  Click Close to finish.