How to make a color to transparent?

To make a color transparent, please do according to the following steps,

Step 1. Select the "Pipe" tool (also called color picker) from the toolbox, or select menu item "Pipe" from the pull-down menu "Tools".

Step 2. Use the color picker to pick a color from the editor window.

Step 3. Click the "Transparent Color ..." menu item from the "Tools" pull-down menu to activate the color palette dialog.

Step 4. The color that picked should have been set to the selected color in the palette, if not please re-select the color that you want it to be set to transparent. Then click the "OK" button.

Step 5. All the points that matches the selected color will be set to transparent.

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