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May 2005

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2005.05.27 07:46 "how to convert a JPEG-IN-TIFF file to jpeg file without decomress & compress", by Kelvin Zhong

2005.05.28 17:21 "Re: how to convert a JPEG-IN-TIFF file to jpeg file without decomress & compress", by Joris Van Damme

2005.05.30 09:58 "Re: how to convert a JPEG-IN-TIFF file to jpeg file without decomress & compress", by Kelvin Zhong

2005.05.30 13:32 "Re: how to convert a JPEG-IN-TIFF file to jpeg file without decomress & compress", by Jean-yves Le Ridant

2005.05.31 07:24 "Re: how to convert a JPEG-IN-TIFF file to jpeg file without decomress & compress", by Kelvin Zhong

2005.05.31 07:24 "Re: how to convert a JPEG-IN-TIFF file to jpeg file without decomress & compress", by Kelvin Zhong

Thanks Jean,

This time I "attach"(or convert) a JFIF-FILE to a JPEG-IN-TIFF FILE
I parsed some infomation i need to know,such as ImageWidth,ImageLength,BitsPerSample,
SamplesPerPixel...,(this data are contained in the SOF0 MARKER,)
and i also figure out the YCBCRSUMPLING value i need to use for a JPEG-IN-TIFF FILE.

but i failed to Get the DPI value of jpeg image file.
(xresolution or yresolution ?) ,
i search for a detailed specification of JFIF (JPEG IMAGE file format),but failed.

does anyone have a detailed information about JFIF format 
(i only have got a specification called:<JPEG File Interchange Format v1.02.>

my question is :how i can a DPI value from a JPEG-DATA stream ?
where does it reside in ?

thanks in advance
yourpattern@126.com
Kelvin Zhong