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PNG is a losless format, JPEG is not. that's why PNG's are bigger. But maybe you want to check the PNG compression rate, not all apps compress the PNG file to the optimum...
Screenshots, IE, and transparany are no problem at all because screenshots should not use transparancy. Anyway, IE only has transparancy problems if you use multiple alpha channels for your PNG file.
Microsoft just doesn't like PNG that much, on the other hand: you can store PNG files from MS Paint.
Lossless compression is very differently grounded to lossy compression.
In short, jpeg adds rubbish to an image to fill up the spaces. When you then make a png version, you save all that rubbish, pixel for pixel, which takes a lot of memory. If you went straight to png on the other hand, you would simply save the fact that there was an empty space at a particular point.
Obviously, this is exactly true, but I think it gets the point across.







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Have these people ever heard of PNG? Oh wait, PNG support in the proprietary Internet Explorer is horrible. Stupid piece of shit proprietary Microseft software.
That skin looks like shit, btw. I'd rather run CDE than their new piece of shit proprietary software.