Archived posting to the Leica Users Group, 2012/07/10

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Subject: [Leica] Daguerreotype Plate Sizes at 72 dpi
From: mark at rabinergroup.com (Mark Rabiner)
Date: Tue, 10 Jul 2012 17:03:44 -0400

Daguerreotype Plate Sizes were based on the avaible size of plate glass used
in windows. Well the full size would have been I don't know about the
cutting down into the quarter and sixteenth plate sizes the logic which was
used. You often see the list on the internet listed as inches. I've not yet
seen them metric. I think inches was a UK thing from way back was it not
also a French thing?

http://en.wikipedia.org/wiki/Daguerreotype

Ok from this source here
Whole Plate:    6.5 x 8.5 inches    (16.5 x 21.5 cm)
Half Plate:    4.25 x 5.5 inches   (11 x 14 cm)
Quarter Plate:    3.25 x 4.25 inches    (8 x 11 cm)
Sixth Plate:    2.75 x 3.25 inches    (7 x 8 cm)
Ninth Plate:    2 x 2.5 inches    (5 x 6 cm)
Sixteenth Plate:    1.375 x 1.625 inches    (3.5 x 4 cm)
It appears  from this list the inche sizes were based on the original CM
sizes not the other way around.
Perhaps I should redo it with a straight to pixel from CM conversion.
Though I don't know what the math is on that.
Here is the source
http://cwfp.biz/platesizes.php




- - from my iRabs.
Mark Rabiner
http://gallery.leica-users.org/v/lugalrabs/


> From: Philippe Amard <philippe.amard at sfr.fr>
> Reply-To: Leica Users Group <lug at leica-users.org>
> Date: Tue, 10 Jul 2012 22:52:22 +0200 (CEST)
> To: Leica Users Group <lug at leica-users.org>
> Subject: Re: [Leica] Daguerreotype Plate Sizes at 72 dpi
> 
> Are you sure the unit used then was the inch?


I'm sure the photos will be
> better if you use cms


;-)


Nice idea about the format, unsure about the
> pixel count though.


AMiti?s
Philippe


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========================================

Message du : 10/07/2012
> 22:04
De : "Mark Rabiner " <mark at rabinergroup.com>
A : "Leica Users Group"
> <lug at leica-users.org>
Copie ? : 
Sujet : [Leica] Daguerreotype Plate Sizes at
> 72 dpi


 Whole plate        6-1/2" x 8-1/2"     468 x 612 pixels
Half plate
> 4-1/4" x 5-1/2"     306 x 396
Quarter plate     3-1/4" x 4-1/4"     234 x
> 306
Sixth plate         2-3/4" x 3-1/4"     198 x 234
Ninth plate        2" x
> 2-1/2"         144 x 180
Sixteenth plate     1-3/8" x 1-5/8"     99 x 117

I
> worked the math on these plates sizes into pixels.

I plan on working up some
> images at these sizes which perhaps will have some
resonance in our photo
> DNA.

Sometimes I  plan on just entering the inch sizes at whatever resolution
> I'm
using on the print. As they are a bit small for the screen even.
I really
> don't know. Maybe I'll find myself using these all the time. Or
hardly ever.
> But It was fun doing it.


- - from my iRabs.
Mark
> Rabiner
http://gallery.leica-users.org/v/lugalrabs/



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Replies: Reply from mark at rabinergroup.com (Mark Rabiner) ([Leica] Daguerreotype Plate Sizes at 72 dpi)
In reply to: Message from philippe.amard at sfr.fr (philippe.amard at sfr.fr) ([Leica] Daguerreotype Plate Sizes at 72 dpi)