To apply filter to an Konva.Image, we have to cache it first with cache() function. Then apply filter with filter() function.
To brighten or darken an image with Konva, we can use the Konva.Filters.Brighten filter and set the brightness amount with the brightness property. The brightness property can be set to any integer between -1 and 1. Negative values darken the image, and positive values brighten the image.
Instructions: Slide the control to adjust the brightness