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2005.01.24 03:43 "[Tiff] about jpeg sample factor", by
2005.01.24 05:29 "Re: [Tiff] about jpeg sample factor", by Lee Howard

2005.01.24 03:43 "[Tiff] about jpeg sample factor", by

Hi all:

Now I am developing a camera application,

but the data image format from camera driver is YCbCr 4:2:2.

I plan to use jpeg_write_raw_data() function of libjpeg to save it as a photo jpeg file,

I am newer to jpeg and I want to know how to set the values of sampling factor to YCbCr422,

   as follow:

    cinfo->comp_info[0].h_samp_factor =2   for Y
    cinfo->comp_info[0].v_samp_factor =2

    cinfo->comp_info[1].h_samp_factor =?   for Cb
    cinfo->comp_info[1].v_samp_factor =?

    cinfo->comp_info[2].h_samp_factor =?   for Cr
    cinfo->comp_info[2].v_samp_factor =?

or where can find some example of using the jpeg_write_raw_data() function?

thanks in advance

 Best Regards.
yangrz