Jpg compression allows for greater savings in filesize if you have large expanses of continuous tone. More noise which is inherent with higher ISOs means that there is much less smooth continuous areas to compress. This is in VERY layman terms, but is how I understand it in my minds eye. A completely blank canvas can compress down infinately, but a speckled surface holds a lot more information to be recorded.
> -----Original Message----- > From: mike wilson [mailto:[EMAIL PROTECTED] > Sent: 04 March 2003 16:36 > To: [EMAIL PROTECTED] > Subject: Digital file sizes (on topic now, I presume?) > > > Hi, > > Cotty wrote: > > > File sizes increase with ISO speed. > > I would have assumed that they would decrease with increase > in speed. Bigger "grain" = less information. Is this a typo > or have I (as usual) missed something? > > mike > >
