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imageimage-processingpngjpegtransparency

Only PNG supports transparency, is that true?

I found JPG does not support transparency, the alpha value is always 255. I am wondering only png supports transparency?

Solution

    • 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.