Download the EntierPageScreenshotByAShotInKatalonStudio-0.1.0.jar and save it into your Katalon Studio project's Drivers dir or Plugins dir.
my.AShotWrapper class and my.DevicePixelRatioResolver class are included in the jar.
See Test Cases code for example:
Test Cases/TC3: take entire page screenshot of a web page and save it into PNG file.Test Cases/TC4: take screenshots of a pair of web pages, and compare them while creating a diff image; measure the image difference.