Things You'll Need:
- Adobe Photoshop CS3
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Step 1
Start Adobe Photoshop CS3 and open an existing document from your files or create a new, blank document.
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Step 2
Make a selection to any object in your Photoshop document by using one of the marquee, lasso or quick selection tools from the Photoshop toolbox. The selection you make should be one that you want to save that you can use later when making an additional selection.
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Step 3
Choose the "Select" menu and click "Save Selection" to open the "Save Selection" dialog box.
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Step 4
Verify that the document you have open is displayed in the "Document" drop-down list and "New" is displayed in the "Channel" drop-down list.
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Step 5
Type a name for the new alpha channel selection in the "Name" text box. This is the name that you will later use to open the selection you are saving.
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Step 6
Be sure that "New Channel" is selected under the "Operation" section of the "Save Selection" dialog box.
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Step 7
Click the "OK" button to close the "Save Selection" dialog box and return to your Photoshop document.








