Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Carlos E.R." Newsgroups: alt.os.linux,uk.comp.os.linux,alt.comp.microsoft.windows,alt.comp.os.windows-11 Subject: Re: scanners. Date: Fri, 14 Nov 2025 20:31:39 +0100 Lines: 76 Message-ID: References: <10e2bmf$g287$1@dont-email.me> <10etvu3$d2va$1@dont-email.me> <10eubg4$fm2h$1@dont-email.me> <10evd4s$oa70$1@dont-email.me> <10evjrd$q7oc$1@dont-email.me> <5ljjulxgot.ln2@Telcontar.valinor> <10f7qtl$30r7q$1@dont-email.me> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: individual.net iRrsGL/7NsNBYasffk1/FQdN6U6M1847ouqE2Kgs43RRwBsx3o X-Orig-Path: Telcontar.valinor!not-for-mail Cancel-Lock: sha1:Q5C/MAkmja/XAWkGTeff6SVk6SI= sha256:aY/BPOU+mbHJZzV9xwIdQvdVdi1x+aePTI+mQfysEjM= User-Agent: Mozilla Thunderbird Content-Language: es-ES, en-CA In-Reply-To: <10f7qtl$30r7q$1@dont-email.me> Xref: csiph.com alt.os.linux:82008 uk.comp.os.linux:23829 alt.comp.microsoft.windows:2973 alt.comp.os.windows-11:27076 On 2025-11-14 19:03, Paul wrote: > On Fri, 11/14/2025 7:24 AM, Carlos E.R. wrote: >> On 2025-11-11 16:13, Paul wrote: >>> On Tue, 11/11/2025 8:19 AM, Java Jive wrote: >>>> On 2025-11-11 03:45, Paul wrote: >>> >>>> >>>>> Regarding scanners, there is the commercial scanner driver package for old scanners. >>>>> That could allow you to access the old scanner from a 64-bit OS, for a price. >>>>> (hamrick.com VueScan). The main concern for old scanner users, is whether all >>>>> the capabilities of the scanner are available, when a novel driver is used. >>>> >>>> Yes, I've heard that mentioned before. >>>> >>>> Tx. >>>> >>> >>> See if there is a Trial Version. >>> >>> One of the main benefits of old scanners, is the CCD based >>> ones (instead of CMOS sensor) have better depth of field >>> and most of the scans done on them will be in focus. >>> I have trouble on my CMOS based scanner, getting >>> the paper pressed hard enough to the screen for >>> a focused copy. >> >> Interesting. I have scanned some flat objects in the scanner, with some relief, worked really well. Or scanned a "page" of on ebook; the display is depressed about 1 mm from the edge. It came out perfect. I know that there was a setting in xsane to change the focus to some small distance, or to the glass surface. I can not find it now, though. Ah! Show advanced options. "Focus 2.5 mm above glass". Means that if I buy a scanner, it has to be CCD. Good to know. >> > > I scanned a sheet the other day, that had been folded > in a box. It's a sample sheet for testing scanners. > > The text right next to the fold is in focus, > the text further from the fold is not. And it > is an appreciable degradation. It could affect > the accuracy of an OCR done on it. That is a CMOS > sensor, which is cheaper to make as the materials > are not as obscure as CCD sensor materials. > > This is why I would recommend finding a scanner > with a CCD (charge-coupled device) sensor. Those don't > have the depth-of-field problem. That's what my old > scanner used. > > In the picture here, you can see an "exaggeration" > of the value of a CCD sensor :-) The book shown would > be perfectly reproduced because the spine on the source > there is unrealistically compliant. You couldn't lay > War&Peace on the scanner and get the spine to lay that flat. > This is only 800DPI. But the scan surface is pretty large. > > https://www.thescannershop.com/plustek-opticpro-a320e-flatbed-scanner/ Yeah, that book has been domesticated :-D I have a low priority project, from an idea I got in one usenet conversation, which is scan my magazines and notes, to save space in the house. That person used an automatic feed scanner, double side pages, coupled with cutting magazines in half first with a big guillotine cutter. -- Cheers, Carlos. ES🇪🇸, EU🇪🇺;