Re: ColorPort and target precision
Re: ColorPort and target precision
- Subject: Re: ColorPort and target precision
- From: Rolf Gierling <email@hidden>
- Date: Mon, 5 Jun 2006 13:34:58 +0200
Hello Roberto,
Am 05.06.2006 um 07:23 schrieb Roberto Michelena:
<snip>
Take for example 5% ; if you create an 8-bit TIFF it ends up being
4.7059% (value 12/255), an error of 0.29% which is 6% of the original
value. Granted it doesn't sound as much, but why have it so if we can
do things better?
Main issue:
5% ends up with as value 12/255 or 4.7059 as you write.
5% should be 5*255/100 equal 12.75 rounded mathematically to
a value of 13 in 8-bit.
13/255 transformed back is 5.097, an error of 0.097% which
is only 2% of the original value.
Certainly a programming error.
Regards
Rolf
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