Picture size

"Grumpy AuContraire" wrote in message
news


§qu@re Wheels wrote:

On this particular day of this month, in the Year Of The Golden Pig, P &
H Macguire did state:


I am in the process of scanning some old slides of 60s to 90s and
wondered what the optimum size should be for posting on this N/G. They
will be scanned at about 300dpi.

Regards

PJM


Absolutely scan at 300dpi or even more. You can always reduce (dpi, size,
etc.) but no matter what, no matter how a pic is, enlarging more than 25%
is useless and there is much quality degradation.

Avoid 72 dpi like unto the plague. That was a semi-arbitrary resolution
based on the early browsers that could not display more than that, and
the
palettes were also fewer than 256 colours. Those were the old days.
And today's monitors, both LCD and CRT, can display even more than 300
dpi, and do it well.


Please list monitors (any) that display higher resolution than 72 dpi.

My monitor is an Apple Mac 23" (running on a PC) and it has 1920 X 1200.
The vertical dimension is 12" So about 100dpi.

My Sony VAIO notebook has 1920 X 1200 and the screen is 9" high. That's 133
dpi.

There are two issues. Scanning for archive and then the (reduced) size for
posting.

When I scan a slide I do it for archiving and I use 4800. Even that doesn't
do the slide its full credit. For archival, you also need to consider the
colour depth. 48 bit is great for a slide, but normal jpg will only save 32
bit. There is a higher depth jpeg (jpeg2000, I think) but I don't use it.
It's a rare format and I don't trust trust it to supported in 20 years time.

If you do scan a slide at 72 dpi, then you will have an image that is
roughly 72 X 72. Almost unusable.

Regards


snip

On this particular day of this month, in the Year Of The Golden Pig, The
Old Bloke did state:

There is a higher depth jpeg (jpeg2000, I think) but I don't use it.
It's a rare format and I don't trust trust it to supported in 20 years time.

It's not even supported now, AFAIK. Haven't seen one in over a year, and
even then the poster got blasted for using it.

I think PNG will be around for a while; it at least is being used, but
mostly as a hi-res high-colour GIF would be because it has transparency
capabilities.

Filesizes are out of line, though. If they can get that under control, it
might hang around a while.

Meanwhile, the JPEG crowd (Joint Photographic Expert Group) are trying (or
were) to grab royalties as a propriety format. If they ever succeeded,
which is about as likely as me inheriting the British Crown Jewels, it
would be a revenue-neutral business.


SW


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