Archived from groups: alt.comp.periphs.scanner (
More info?)
Once again, thanks for the info. My scanner is Epson perfection 3170
http://www.epson.com/cgi-bin/Store/consumer/consDetail.jsp?BV_UseBVCookie=yes&oid=35836301
"Wayne Fulton" <nospam@invalid.com> wrote in message
news
uudnaF4FsW2_eDdRVn-uw@august.net...
> In article <107pg7b55iqrm7c@corp.supernews.com>, dgvxfcsrt@okghbvg.org
> says...
> >
> >
> >
> >
> >Thanks for the info. For your info I have a HP Photosmart printer, it
takes
> >2 colour cartridges, one is the typical tri-color the other is 3 "pastel"
> >colors. When I open up print dialogue it gives me the option of printing
in
> >4800 dpi "optimized" I'm guessing that means the software will "pixelize"
> >the file to create a better photo. On another note, if my printer does
take
> >2 cartridges with more than 3 colors does that affect the 24 bit limit
you
> >mentioned?
>
>
> There is a huge conceptual difference between the printers ink dot ratings
> (like 4800 dpi), and the image's pixel resolution (like 300 dpi, but this
dpi
> term has a very different meaning).
>
> The printers rating is about motor steps to position ink drop dots of 3 or
6
> colors (about ink drops of 3 or 6 colors, not about pixels). This is a
> Quality setting, not really a resolution setting. This number is NOT
about
> image pixels. The 6 colors vs 3 colors does not affect resolution, but 6
can
> help to print photo quality better, so that the lighter ink dots are less
> visible in the lighter colored areas.
>
> The image resolution (like 300 dpi) is about pixels per inch (dpi or ppi
are
> interchangable in this use), where each pixel might be one of 16 million
> colors. This is NOT at all the same thing as ink drop dots.
>
> You want to select one of printers higher quality ratings to print photo
> quality (as opposed to a low quality but fast draft mode setting), but you
> scale images in the ball park of about 300 dpi (pixels per inch) for photo
> quality. Maybe print 300 dpi images at 4800 dpi printer setting.
>
> See
http://www.scantips.com/basics3b.html for more about this difference.
>
>
> >I made a mistake in my earlier posting, my scanner offers 48 bit and 24
bit
> >(not 32)
> >
> >I'm continuing to experiment, it seems that for scanning my 35mm slides
I'm
> >tending to settle with 24 bit color @6400 resolution. Keeping in mind
that
> >I'm creating a master digital archive for long term storage, and from
that
> >master file I will create scaled down images for CD/DVD viewing on a
screen
> >such as TV or monitor, However I want to have that digital archive
available
> >to be able to create the most optimum prints for various selected images
> >that family members may request.
> >
> >Am I on the right track here?
>
> I seriously doubt you have a 6400 dpi scanner? But if somehow you do,
then
> there is a special time and place you might consider using it. The concept
is
> that the ratio of (scanning resolution / printing resolution) is the
> enlargement factor. For example, scaling to (6400 dpi scan / 300 dpi
print)
> would give 6400/300 = 21.3X size enlargement, printing about 30x20 inches
> from 35 mm film size. If that is the goal, and if you have a 6400 dpi
> scanner, then that is the right plan (except that such large prints are
not
> normally printed at 300 dpi, because the requirements are so great, and
> printers that size often cannot physically do 300 dpi).
>
> More normally, we might scan 35 mm film at say 2700 dpi and print at 300
dpi,
> for 2700/300 = 9x enlargment. 35 mm film is about 0.9x1.4 inches, so this
9x
> is about 8x12 inches (about A4 size) from 35 mm film. This image size
would
> be about (8 inches x 300 dpi) x (12 inches x 300 dpi) = 2400x3600 pixels,
> about 25 MB.
>
> Again, the purpose dictates this. If you wish to print 8x12 inches, then
this
> is appropriate. If you won't print it 8x12 inches, then it is probably
still
> excessive for the purpose. When scanning prints, enlargement is less
often
> an issue, so we might scan at 300 dpi, print at 300 dpi, for 100% size (no
> enlargement).
>
> Some scanners can output 48 bits, but only a few photo editor programs can
> accept 48 bits, and our printers and video want 24 bits too. I think you
> probably want 24 bits. If you have a 16 bit program (like full Photoshop),
> then some people do like to output 48 bits, correct the tone adjustments,
and
> then convert to 24 bits for printing or archiving.
>
> The site below should be a big help to you getting started.
>
> --
> Wayne
>
http://www.scantips.com "A few scanning tips"
>