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how to detect if a jpeg file is progressive or not


I have searched google but haven't found an answer I was looking for. I
want to upload some family pics to share among relatives. Some have
dialup connections. To facilitate image downloads in their browsers, I
want to upload progressive jpegs. How do I find out if the jpegs I
already have are progressive or not? If they are not, how do I convert
them to progressive jpegs?

I have:
ii imagemagick


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