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High-end smartphones, such as the latest Apple iPhone and Google Pixel 2, offer the so-called Portrait Mode when taking pictures. This mode blurs the background so that the foreground object stands out, thereby creating a professional-looking photo with almost zero effort. Fortunately, this act of blurring the background also reducing the size of the JPEG file of that picture. In a nutshell, JPEG compression works by reducing the details which our eyes do not pay attention to. This is why when ...