Archived from groups: comp.periphs.scanners,rec.photo.digital,alt.comp.periphs.scanner (
More info?)
<nomads_05@yahoo.com> wrote in message
news:1116807311.987333.130370@g47g2000cwa.googlegroups.com...
> Thank you,
> Paul and Bart's replies about a scanning calculations, has been very
> helpful. Philip, Adobe Photoshop is magnificent. It lets you put in
> any variable and solve for the missing input.
>
> Someone far away, in another land, will be running scans for me. These
> will be saved to CD so size does not matter. I am thinking about
> "Portable Network Graphics," (.png). What do you think?
Tiff is more portable and widely supported and lossless.
If you do not mind a lossy format, then High Quality Jpeg is the way to go.
Image formats:
http://www.scantips.com/basics09.html
>
> Should I have him shoot it in the scanners, natural/optical resolution,
> and I just take it from there?
>
> So Photoshop it is for the scanning calculations, however, for those
> not fortunate enough to have Adobe, what Paul has posted needs some
> comment. Although other sources agree, "Scanning an image for the
> screen is the same as scanning one for printing except the output is
> usually specified in pixels, not inches." Scanning an Image for
> Screen Display at
http://www.shortcourses.com/pixels/scanning.htm also
> say's "images are usually scanned at 72pp for screen display."
> This is simply not true and flies in the face of what we learn from
> Wayne Fulton's visual examples at the web site posted by CSM1.
> Shortcourses also says the screen's resolution is on average 72 dpi.
> This appears to be pure bull. You do not measure pixels in inches. I
> am sorry but it looks like this writer has a problem explaining what
> he, thinks he means.
>
> 1 Enter the width in inches of the image to be scanned.
> 2 Enter the depth or height of the image to be scanned.
> 3 Enter the screen's resolution in dots per inch (dpi). This is
> normally 72 dpi on average.
> 4 Enter the desired width of the image in pixels.
> 5 The vertical size of the image is calculated by dividing its width on
> line 4, by the ratio of the original's width to height; calculate by
> dividing line 1 by line 2.
>
> Does this make any sense to you?
>
> www.scantips.com/no72dpi.html site is very informative, but it does
> NOT have a calculation from inches to pixels, which was the question.
> Fulton's calculator would be much more useful if you could pose
> questions for any missing variable, and not just linearly. All you can
> do with that thing is to print. I do not want to print. The question
> involves the natural flow of the universe. Moving from hard to soft,
> yang to yin, print (inches) to screen (pixels.) In essence moving from
> the past into the future.
A calculation from Pixels to Inches or Inches to Pixels requires the DPI
(Dots Per Inch) or PPI (Pixels Per Inch) that you are going to use for the
scan.
You can scan a 8.5 x 11 magazine and make it fit any screen size by Resizing
and Cropping. A magazine should be descreened with the scanner descreen
function at scan time.
http://www.scantips.com/basics06.html
The quality of the image depends on the DPI the document was scanned at.
For a Paper product, it has been shown that 300 DPI to 600 DPI is about all
the information contained in a paper document or photograph. (Not true for
film).
Since you are not the person making the scan, I would ask for 300 DPI at a
minimum. You can resize the image in Photoshop, but you can not put back
what was loss in the scan.
Now for the size of the image in pixels if you scan that 8.5" X 11" document
at 300 DPI.
The math: DPI or PPI can be used (they are almost the same thing).
(Inches) times (Dots Per Inch) = Pixels.
(Pixels) divided by (Dots Per Inch) = Inches.
(Pixels) divided by (Inches) = Dots Per Inch (or in this case PPI).
8.5 times 300 = 2550 pixels
11 times 300 = 3300 pixels
So you get 2550 X 3300 pixels from a 8.5" x 11" magazine when scanned at 300
DPI.
If you scan at 600 DPI (this is over kill).
8.5 * 600 = 5100
11 * 600 = 6600
At 600 DPI you get 5100 x 6600 Pixels.
To fit any of your screen sizes takes some resizing and cropping of the
image.
Adobe Photoshop is very good at that job!
Personally, I very seldom scan a 8.5 x 11 document at more than 150 DPI.
I make copies (scan/print) at 150 DPI. A fax is 200 DPI.
>
> Much Mahalo..
>
> CSM1 wrote:
> > <nomads_05@yahoo.com> wrote in message
> > news:1116727113.784937.9960@g47g2000cwa.googlegroups.com...
> > > Is there a Scanning Calculator that will help you calculate the
> > > variables to be used when you have the Input Size of the Photo,
> Film,
> > > or Document in length (8.5 by 11 inches) and you want the output in
> > > pixels?
> > >
> > > For example how do you scan a magazine cover so that it will fill
> the
> > > screen of various Apple monitors?
> > >
> > > 2560 x 1600 pixels
> > > 1920 x 1200 pixels
> > > 1680 x 1050 pixels
> > > 1280 x 854 pixels
> > >
> > The easiest calculator to use is:
> >
http://www.scantips.com/calc.html
> >
> > --
> > CSM1
> >
http://www.carlmcmillan.com
> > --
>
--
CSM1
http://www.carlmcmillan.com
--
Facebook
Twitter
Instagram