What the imfinfo function of matlab return size of compressed or uncompressed image?

I imfinfo function of the matlab return the size of image in bytes. I want to know whether it returns size of the compressed or uncompressed jpeg image?

Answer 1

[Walter Roberson]

The FileSize field it returns is the size of the file on disk. If you want to know the size of the uncompressed JPEG image you can multiply Width times Height times BitDepth and divide by 8

[anu]

Thank a lots. You mean to say FileSize field returns size of the compressed jpeg image?

[Image Analyst]

Yes. When it's on disk, it's compressed. It only gets decompressed after you call imread() which reads it from disk, uncompresses it, and places it into the variable you specified.

[anu]

Thank you very much