>But, this 8600 has, shall we say, some "issues" with
>monitors in general, which leads me to be a bit
>suspicious of the 8600 itself. I suspect that
>something's toast in there, that's what I think - both
>the bus speed and the processor speed are
>ever-so-slightly above specs, which seems a bit
>suspicuous, doesn't it? like (speculation follows)
>maybe some previous owner turned it up, had problems
>or partially fried something on the motherboard,
>turned it back down to sell the thing quick before
>something else went out, but didn't get it *quite*
>back to factory specs?? Anyway, the 6360 never behaved
>like this, *whether* using two monitors or *not* (yes,
>I had dual monitors on the 6360 - it was great - made
>the thing actually usable). I was hoping that the
>72.001 thing maybe was a valuable clue to eventually
>solving the other problems.
>
>Maybe it's unrelated though.
>- JMarie
Hi,
I would guess it's unrelated - the whole ppi measurement thing is
quite misleading when applied to the analogue output of a monitor as the
values can be interpolated to optimize the digital image info for the
capabilities of the display. To display on two monitors is just another
calculation. Image retouching in Photoshop is all complex number
crunching which is why it is such a cpu, ram and disk hog.
So an image of 300ppi can be viewed in Photoshop at say 25% on a
72ppi display just by crunching the numbers and a scanner with a poor
optical res of 600ppi can boast 9600x9600ppi interpolated res just by
educated guesswork - it calculates an average of the neighbouring pixels
by varying methods and just drops it in - hey presto! double the res for
a bit of maths instead of a more expensive ccd array.
But the calcs do not always work out pat and 'spare' parts of pixels
are kept or discarded according to their worth in the image - or they can
be interpolated into the nearest pixel. The calculation is much improved
with error diffusion - which distributes the spare parts created by a res
change.
Different macs can give different measurements if the onbard
graphics is older or newer and calculates slightly differently -
similarly with video cards.
Pete
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