On 2010-01-16 06:55, Cristian Secară wrote:
> On Fri, 15 Jan 2010 21:56:40 +1100, Philip Rhoades wrote:
>> - When saving as JPG with 85% quality am I losing information?
> Yes, but still with the same 85% quality you may obtain different
> results by changing other parameters.
> Just look at the following example. Note the file size for each, but
> most of all, look at the color quality and the outline of objects
> (the files are quite small; save them somewhere and look at them by
> switching forth and back so you can notice the differences).
> The JPEG were both saved with 85%, but one with subsample for best
> quality and the other with subsample for minimum file size:
> Take the .bmp and do further tests with the save options.

Yep, the only one where I could see a difference was with the last one.

It still seems counter intuitive that opening a JPG (even if it is a 
photo rather than a computer generated image) and immediately saving it 
with 100% "quality" increases the size by 2.5 . .


Philip Rhoades

GPO Box 3411
Sydney NSW      2001
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