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What is the 4th component of JPEG test image by ISO?

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amith

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JPEG

Hi All,
I have a 4 component jpeg test image provided by ISO, but generaly it is of 1 compent (grayscale) or 3 component(RGB ), but what is of 4 component , if i run this image IJG code
it is saying that the out put file must be gray scale or RGB , what does it mean .can any one explian me .

Gemini.
 

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