Another tool you may want to explore is Pixel Perfect.
The Pixel Perfect window displays a magnified version of the screen that's currently visible on the attached Android device or emulator, and lets you scrutinize the individual pixels that make up your UI. You can also use it to overlay an image over your UI, which is handy for checking how your UI compares to your digital wireframes.
Pixel Perfect is integrated into the Android Device Monitor. To launch Pixel Perfect, select Window from the Android Device Monitor toolbar, followed by Open Perspective, Pixel Perfect, and OK.
The Pixel Perfect window contains the following areas.
This window displays a magnified version of the UI that's currently visible on the connected Android device or AVD.
By default, Pixel Perfect doesn't update automatically to reflect changes that occur on screen, so you'll need to keep clicking this pane's Refresh Screenshot icon. Alternatively, if you want Pixel Perfect to...