What's the purpose of Paint Only Alpha

Hey,
I have started using the SIlhouette paint OFX and Its just awesome, BUt I would like to know what’s the use of ‘Paint Only Alpha’ in the Paint parameters. I couldn’t find the definition in the userguide.

Thanks in advance,
Manooj Manoharan

In the Paint plug-in, Paint Only Alpha in the Node parameters window is not used. By default, the Node parameters windows is not displayed. You must have manually turned it on.

No, there are two options, Hard and Soft. Not able to judge the difference between the both

If you want to see what Paint Only Alpha does in the plug-in, select View > Paint above the Viewer and then change Paint Only Alpha from Hard to Soft. However, Paint Only Alpha is only used in the standalone.

Paint Only Alpha in the Node parameters window is not used in the Paint plug-in. As I previously mentioned, by default, the Node parameters windows is not displayed when the Paint node is selected in the plug-in. You must have manually turned it on.

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Thanks for the clarity!