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January 2006

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2006.01.12 10:39 "support scaling parameters while read tif file with JPEG compression.", by Kelvin Zhong

Hi All,

I found Jpeglib is enable to read the image data with DCT scaling
choices.
see function  jpeg_calc_output_dimensions in jdmaster.cpp file. this will
accelerate read image while the custom only need a preview image.
(say 1/4 size of the original size).

And i found it's can be done through the 
JPEGState.cinfo.d(jpeg_decompress_struct) parameters. in libtiff.
so why not such functionality isn't available today , I think it's very
powerful.

Do anyone have do similiar things ?
any things (codes or ideas) for share ?

Kingore@126.com
Kelvin Zhong
01/12/2005