Step 4: Customize the focal points
By default, the Colorize filter will automatically select the colors to use in the photo. However, you can easily customize the colors by using the Focal points within the filter. You can either use a combination of the “Auto color image” setting plus adding your own customizations, or you can start from scratch and select everything yourself.
To adjust the Focal points, hover over the preview image in the filter panel, and click over the area you want to adjust. Then use the Size slider to help Photoshop determine the size of the area for that specific region.
In this example, I changed my dad’s jacket to a light-blue color and fixed some of the discolorations in other parts of the photograph.