When building a template you will see an option to select 'High Resolution' and 'Anti-Alias'.
Selecting high resolution will create a retina image (i.e. the live image will be twice the size of the template). You will need to set the width / height in the template to scale the image back to the size you need. This means that it will look high definition on retina devices.
A high resolution image contains 4 x more pixels than a non-high resolution image.
Select High Resolution when you see it to banish blurry images!
Selecting Anti-Alias improves the quality of text contained in the live image. Anti-aliasing is the smoothing of jagged edges of the font so that it appears smoother and clearer.