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I have image that is not opening. However online convertors are able to convert it.

How do I retrieve the image format?

When opening file in text editor, the following information may be found:

Creator: JasPer Version 1.600

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The file utility might be helpful in this case. – Marco Jul 19 '12 at 10:19
    
Or the identify utility from ImageMagick. – grawity Jul 19 '12 at 10:19
up vote 3 down vote accepted

JasPer is a library codec for JPEG-2000.

As of 2012, JPEG-2000 is not widely supported in web browsers, and hence is not generally used on the Internet.

Most JPEG images probably still use the 1992 JPEG Codec and the EXIF and JFIF file formats. So those are probably what a lot of software still assumes.

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