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June 2012

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2012.06.17 00:18 "another problem about TIFFSetField Precision", by He Yang

2012.06.17 07:56 "Re: another problem about TIFFSetField Precision", by Andreas Kleinert

2012.06.17 07:56 "Re: another problem about TIFFSetField Precision", by Andreas Kleinert

E.g. ensure that float and double are of same size?

-------- Original Message  --------
Subject: [Tiff] another problem about TIFFSetField  Precision
From: He Yang <he-yang@live.com>
To: tiff@lists.maptools.org
Date: 17.06.2012 02:18

> 
>   I want set a rational field,  the value is 1/1250,
>   I first compute the value use two doubles 1 and 1250, and then convert 
> the value to float, which is 0.0007999999998
> and use TIFFSetField,  then I immediately use TIFFGetField to read the 
> value out,  and the result is a float value which
> is correct, but after i write the tiff to file and read the file back, 
> then I use the TIFFGetField, the value become
> 0.00079999999821, which likes a value compted use two float 1 and 
> 1250.   Is there another method can set the rational value with more 
> accurate result?
> 
> Thanks