Why can’t JPEGS be transparent?
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Because their encoding does not include transparency. Every digital image is made of grids of values, which describe the brightness for that point. In a greyscale image, all the values describe levels of brightness from black, through levels of grey, to white. Expanding on this, a colour image has three grids, one each for red, green and blue. In a .png there is a fourth grid, which allows levels of transparency. So in a way, asking why a .jpg can’t do transparency is similar to asking why a greyscale image can’t do colour. It could if it had a channel for it, but it doesn’t.
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