Pete wrote:
> Oversampling in audio is a hardware implemented function, which is
> really only of any worth when it's applied at the recording stage.
> The primary use is to make the 'brick wall' low-pass filter more
> effective (and cheaper to make) prior to the A to D conversion stage.
Er. Sor
Austin wrote:
>> Er - I thought we were talking about *decreasing* the
>> apparent grain by filtering?
>I must have misread the post i replied to...I thought I read
>INcrease, which made no(t much) sense to me...
I probably referred to the fact that aliasing in a scanner *increases* the
apparent
I recently had a computer crash and had to re-install just about everything.
I also recalibrated my monitor using Photocal and the mc7 sensor. After I
did this I opened some b&w files in Photoshop and discovered posterization
in the very dark areas that I hadn't noticed before. I use Vuescan to
> Er - I thought we were talking about *decreasing* the
> apparent grain by filtering?
I must have misread the post i replied to...I thought I read
INcrease, which made no(t much) sense to me...
-
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on 12/7/00 3:51 PM, Rob Geraghty at [EMAIL PROTECTED] wrote:
> Do the filter in Photoshop work with 16bit data yet?
The important ones (Gaussian Blur, Add noise and most importantly Unsharp
Mask) sure do in Photoshop 6!
Andrew Rodney
Tony wrote:
>Rob Wrote:
>> My point was - I wonder whether digital interpolation would be
>> useful in a scanner design to smooth the output?
>That's what anti-aliasing filters in image editing software do, interpolate
>pixels to achieve smoothing.
Sure, but as I pointed out elsewhere:
1) There's
Dieder wrote:
>i.e. 2000.11.30 0X, 2000.11.30 01, etc etc. Now I realize that you
>have to choose a separator that is compatible with your OS.
I've been using a similar method on the PC but without any punctuation;
date in reverse order followed by a film number followed by a frame number
viz: "
Austin wrote:
>Rob Wrote:
>>Putting a smoothing function into the scanner's own interface would be
>> much simpler from the user perspective.
>Simpler, yes, but how many people would actually use it?
I would for one! Last I checked, I wasn't the only one appalled by the
coarse "grain" appearing
Rob Geraghty wrote:
> When I was reading something someone else wrote on this topic I couldn't
> help wondering about the kind of oversampling used in CD players to filter
> the output. I wonder if similar technology could be used to smooth the
> output from a scanner - maybe some scanners alrea
Thanks guys,
I did'nt think it could be so easy.
I think I can say that now I have learnt everything about scanning.
>From which scanner and printer I needed and to the knowledge to get results,
from this list.
Thanks again,
David.
Let me try this again, this time directly linking to the files instead of
cutting and pasting...
> --
>
> > I always thought that down sampling consisted of some kind of averaging
> > (of
> > samples).
> > I thought bicubic and bilinear and such terms could as well be related
> to
> > do
> Further, at least at first,the
> "oversampling" CD players were low end units
That's not quite true, they were mid range units, and it was because the
initial interpolation filters were quite bad, and were only 2x to 4x, and
certainly did not meet the audio quality that was achievable withou
> My point was - I wonder whether digital interpolation would be useful in
> a scanner design to smooth the output?
That's what anti-aliasing filters in image editing software do, interpolate pixels to
achieve smoothing.
Regards
Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibi
> In summer '99, for the total eclipse, I experimented with
> viewing the sun through CDs, and found two together gave
> comfortable viewing.
*That* would have made a nice photo :-)
Regards
Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info &
comparisons
> Save them as 2 digit numbers. 01, 02 03, etc
Yes, this is what I do : assign each film a reference number (which relates to a
database record), and then number each frame with the frame number on the film rebate.
eg 1234_03
Regards
Tony Sleep
http://www.halftone.co.uk - Online portfoli
Dale,
To be sure I will contact the Canadian sales manager. Either he or I will
get back to you soon.
David
-Original Message-
From: Dale & Gail [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 07, 2000 7:23 AM
To: [EMAIL PROTECTED]
Subject: Re: filmscanners: Polaroid Sprintscan 120?
Austin Franklin wrote:
>
> > The oversampling business in CD players is mostly a method
> > to save as much as maybe a dime in their production costs to reduce the >
> > cost of the analog output reconstruction filter.
>
> Not quite. There is no oversampling in a CD player, it is interpolation
David,
you filenames might also appear to be a little random when
you initially write the name or move a file from one folder to
another. To clear this up just run Windows Explorer and view a folder
that has your images in it and click on Name at the top. This will
re-aarange your file
> I always thought that down sampling consisted of some kind of averaging
> (of
> samples).
> I thought bicubic and bilinear and such terms could as well be related to
> down sampling as they could to upsampling.
> Now I wonder: how does downsampling work?
> Does it exist of sampling only one of
> I always thought that down sampling consisted of some kind of averaging
(of samples).
It SHOULD work that way, if the system (hardware/firmware/driver) is
designed properly. But, just as a note, when doing a pre-scan, I assure
you it doesn't do it at full resolution...obviously, or it woul
>Putting a smoothing function into the scanner's own interface would be
> much simpler from the user perspective.
Simpler, yes, but how many people would actually use it?
> Why would you want to do it... haven't we been talking about increased
> apparent grain for a couple of years now?
How doe
David,
I've seen an add in Canada reducing the price of the Sprintscan 4000 by
$500.00 Cdn to $1799.00. Could you tell me what is shipped with the 4000,
i.e does it come with a SCSI adapter ?
Thank you
Dale
http://albums.photopoint.com/j/AlbumList?u=10024
"If you aren't the lead dog the scen
My wallet is recommending I look at the UMAX 3450 since its only $179 CDN
(about $110 USD)
I am looking for something to 'proof' my 4x5 - anything I really like I can
have enlarged normally, the rest I can print out.
regards Dave
David,
I can't stress enough the need to create and organise folders
and file names.
I stores the images from my digital camera in the form of...
01-Garage,jpg
02-Cat.jpg
et cetera
This method does have the
Wait a minute,
I always thought that down sampling consisted of some kind of averaging (of
samples).
I thought bicubic and bilinear and such terms could as well be related to
down sampling as they could to upsampling.
Now I wonder: how does downsampling work?
Does it exist of sampling only one
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