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Including two different images to support retina or just scaling down the retina image, as in this video?
When I search the internet, most people recommand using two kind of images, one with a @2x postfix, and one "normal" image. But in treehouse courses, I often see them simply scaling a retina image down, and use one image for both retina and normal displays.
What are the pros and cons about the 2 different techniques ?
The main problem with just scaling down the 'retina' images is that the file size is larger than required for lower resolution displays.
The main advantage is that you have fewer files stored on a server and the CSS would be simpler.