Archived posting to the Leica Users Group, 2010/06/09

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Subject: [Leica] Film/slide scanner recommendations? Samples?
From: lluisripollquerol at gmail.com (Lluis Ripoll Querol)
Date: Wed, 9 Jun 2010 22:57:42 +0200
References: <AANLkTikYPlv1b1VCrgkBhukfRiHn3aBs1XAQ9RWKzPD2@mail.gmail.com> <AANLkTilkb_UD_h7v9KoXLW2iCzlkLpJoGmivwzvap7pf@mail.gmail.com>

Hi Jean,

Thank you for your details, I didn't do any calculation, I simply read  
the data of my scans. Believe me, I'm not really concerned by the  
pixels, in fact they are lovely, quite, silentious, discret...

Fins aviat too!
Lluis


El 09/06/2010, a las 2:25, Jean Louchet escribi?:

> Hi all,
>
> Sorry Lluis, I don't agree with your calculations.
> A 6x6 neg. is actually 56x56 mm
> At 3200 ppi it makes 3200 x 56 / 25.4 = 7055 pixels wide
> hence the scan makes 50 MPixels (actually 49.77)
> Then the file size depends on coding. In uncompressed raw (bitmap)
> format such as .pbm, if using 8 bits per channel, it will use a memory
> space of 50 MBytes in monochrome or 150 MBytes in colour.
>
> If one scans at 1200 ppi it makes 1200 x 56 / 25.4 = 2645 pixels wide
> hence 7 MPixels.
> A 8 bit-depth .pbm monochrome file will then be 7 MBytes.
> A 8 bit - depth .pbm RGB (colour) file will be 21 MBytes.
>
> One should add the header sizes but this is negligible (.pbm headers
> use 15 bytes plus the optional comments )
>
> Some scanners may use more than 8 bits depth in order to give deeper  
> dynamics.
> Once compressed it will use much less space, of course, but the
> compression ratio depends on the picture itself and on coder
> adjustments.
>
> Fins aviat,
> Jean
>
>>
>>
>> Message: 6
>> Date: Tue, 8 Jun 2010 00:51:15 +0200
>> From: Lluis Ripoll Querol <lluisripollquerol at gmail.com>
>> Subject: Re: [Leica] Film/slide scanner recommendations? Samples?
>>        Anyone  use     Braun?
>> To: Leica Users Group <lug at leica-users.org>
>> Message-ID: <91DA40FD-337F-484D-80A5-D0342CDDD273 at gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed;  
>> delsp=yes
>>
>> At 3200 ppi 6863 x 683 pixels , 90 MB
>>
>> At 1200 ppi 2400 x 2400 pixels, 5,8 MB
>>
>> If you need others, let me know
>>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information



In reply to: Message from jean.louchet at gmail.com (Jean Louchet) ([Leica] Film/slide scanner recommendations? Samples?)