Because PNG is best for images with large areas of the same color. With photographs or images with large numbers of color, JPEG becomes the smaller format. A desktop screenshot can be 800kb in maximum compressed PNG but less than 200kb in maximum quality JPEG.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Because PNG is best for images with large areas of the same color. With photographs or images with large numbers of color, JPEG becomes the smaller format. A desktop screenshot can be 800kb in maximum compressed PNG but less than 200kb in maximum quality JPEG.