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Subject: [filmscanners] RE: dpi - formerly PS sharpening
Bob,
Since this has gone beyond the pale of what might be relevamnt to the list
and could result in another terminological free for all with everyone and
their brother jumping in with their two cents, I have decide to post this to
you privately
-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of bob frost
Sent: Saturday, August 17, 2002 12:09 PM
To: [EMAIL PROTECTED]
Subject: [filmscanners] Re: dpi - formerly PS sharpening
Laurie,
I don't want to get into an endless argument over niceties of linguistics
either, but I still
I don't know what units the resolution is measured in: dots per inch or dots
per meter or whatever. And as to what formats indicate resolution, all I did
was open a bunch of files in ThumbsPlus and see which ones had a resolution
listed. It's possible that BMP files have an optional resolution
-Original Message-
From: [EMAIL PROTECTED]
By
leaving the dpi at 2700 or 4000, is the file size larger than it
would be at
72dpi?
Not really. What your are doing is creating an image with a certain
dimension, i.e. 450x300 pixels. Then you set the dpi to for instance 4000
without
On Thu, 15 Aug 2002 18:33:15 -0400, you wrote:
What on earth are you talking about? Where do you set the DPI of the scan?
I'm not Anthony, but on every piece of scanning software I've owned -
all three of them! ;-) (HP, CanoScan and Vuescan) Even Vuescan
calls it dpi. I'm aware, from
What on earth are you talking about? Where do you set the DPI
of the scan?
I'm not Anthony, but on every piece of scanning software I've owned -
all three of them! ;-) (HP, CanoScan and Vuescan) Even Vuescan
calls it dpi. I'm aware, from reading www.scantips.com that ppi is
perhaps
On Thu, 15 Aug 2002 20:35:02 -0400, you wrote:
I understand. The comment was specifically about saving the file...and you
don't save dots, you save pixels. The file, according to PS, is N pixels in
width, by M pixels in height.
After you scan, what does Viewscan show for units? How about
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Subject: [filmscanners] RE: dpi - formerly PS sharpening
I usually leave images on my site set to the DPI of the scans,
so they are
always at 2700 or 4000 dpi.
Anthony,
What on earth are you talking about? Where do you set the DPI of the scan?
Scanners scan in SAMPLES PER INCH, and create
Hi Ken,
2592x3888 pixels, 2720 dpi, 4x6inch, 22.7MB
So it *is* saving a resolution in dpi
I believe it is simply calculating the DPI. It's certainly easy enough to
do... What file format are you talking about, BTW?
The numbers you gave above don't seem to fit...did you make those numbers
On Thu, 15 Aug 2002 21:45:28 -0400, you wrote:
2592x3888 pixels, 2720 dpi, 4x6inch, 22.7MB
So it *is* saving a resolution in dpi
I believe it is simply calculating the DPI. It's certainly easy enough to
do... What file format are you talking about, BTW?
TIFF files.
The numbers you gave
Gee Austin, thanks for that insight. I NEVER would have figured out what
Anthony was getting at without your clear, exacting, obsessive attention
to detail and need to find someone wrong and fix things that aren't
broken. I feel SO much better informed now. What a very useful posting.
But Ken, you've missed the whole point of that posting... it is because
this poster's purpose for living is to correct all the minutia(e) that
doesn't conform with his reality. With that in mind, you'll certainly
now understand the full value of that edification.
Basically worthless to most
On Thu, 15 Aug 2002 19:35:45 -0700, you wrote:
But Ken, you've missed the whole point of that posting... it is because
this poster's purpose for living is to correct all the minutia(e) that
doesn't conform with his reality. With that in mind, you'll certainly
now understand the full value of
Ed writes:
By leaving the dpi at 2700 or 4000, is the
file size larger than it would be at
72dpi?
No. DPI is just a number recorded in the file; it has no influence at all
on the file size.
Also, by leaving the dpi at 2700 or 4000
are you creating a higher quality graphic
file?
No.
Paul writes:
Just changing the dpi number doesn't change
the size of the file; it changes the size
(in inches) of the image.
Sort of. An image file doesn't actually have a size in inches. However, if
you record a DPI setting in the file, and if a program reading the file
chooses to
Nick writes:
One of the reasons for the confusion is that
Photoshop (stupidly, in my opinion) insists
on changing the pixel dimensions when you change
the dpi. That, of course, will change your image.
Photoshop is designed to prepare images for print use as well as online use.
When you are
Austin writes:
Where do you set the DPI of the scan?
The DPI of the scan in the image file is set by the scanning software that
creates it. The Nikon scanners I use routinely set the DPI to the actual
DPI used to create the scan (usually 2700 or 4000, the two resolutions I
most often use).
Anthony,
The DPI setting of the file is just an information field,
Exactly what field is it, and in what file format are you talking about?
A few
programs look at the DPI setting when you select options like display at
actual print size or when you try to print a file.
Display actual
I didn't say it changed the size of the image file in inches, I said it
changes the size of the image in inches. But basically, we agree.
--
Ciao, Paul D. DeRocco
Paulmailto:[EMAIL PROTECTED]
From: Anthony Atkielski
Paul writes:
Just changing the dpi number
JPEG and TIFF both store horizontal and vertical dots per inch in their
headers. GIF and BMP don't. I haven't checked other formats, but I expect
any modern format do.
--
Ciao, Paul D. DeRocco
Paulmailto:[EMAIL PROTECTED]
From: Austin Franklin
The DPI setting
2592x3888 pixels, 2720 dpi, 4x6inch, 22.7MB
So it *is* saving a resolution in dpi
I believe it is simply calculating the DPI. It's certainly easy
enough to
do... What file format are you talking about, BTW?
TIFF files.
Hi Ken,
TIFF files can have resolution tags (two, one for X
Hi Paul,
JPEG and TIFF both store horizontal and vertical dots per inch in their
headers.
Yep, but in TIFF the tag is called resolution, not DPI...
GIF and BMP don't. I haven't checked other formats, but I expect
any modern format do.
Do they store image dimensions, like inches? They
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