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I found JPG does not support transparency, the alpha value is always 255. I am wondering only png supports transparency?
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JPEGs don't support transparent backgrounds. Non-rectangular logos and graphics featuring lots of text are unlikely to work well in this format as a result. JPEG images will also struggle to blend seamlessly with web pages that feature different background colors. PNG files, on the other hand, do support transparency.
The JPEG format doesn't support transparency. But we can create our own transparency using a second image as an alpha channel.
png-32 supports different levels of transparency. Each pixel can have an opacity between 0 and 255, with 0 as completely transparent.
png-24 supports setting one color as fully transparent. Everything else will be opaque.
gif uses a color palette. You can specify that one color in the palette is fully transparent.
png-8 also uses a color palette but each color in the palette has its own opacity value, so it supports varying levels of transparency too.
jpg does not support transparency.
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JPEG 2000 supports full transparency. See JPEG 2000 Side channel spatial information.
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