Step 2: Select the Layer you would like to Blur in the Layer Panel. This feature is located in the Filter dropdown menu and lets you add a Gaussian Blur to a target layer.įollow the steps below to add blur in PaintTool SAI. PaintTool SAI has one native feature to add blur to an image. Method 1: Adding Blur with Filter > Blur > Gaussian Blur Unfortunately, this tool was not integrated with Version 2.