Archived posting to the Leica Users Group, 2012/07/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Well I'm trying to keep it simple as possible so I can see some of my images now the way for many decades the first photos " Daguerreotypes" were seen and experienced. I'd like to hold a whole plate in my hand from an image I'm made on 300 width rag paper and see if it does not strike some kind of chord in me that a "letter size" 8.5 x 11 inch does not or my default which is 5 x 7 Inch or other normal darkroom sizes. 8x10 inch, 11 x 14 inch. Even though the Daguerreotype era was only the first two decades of photography. 1839 to 1860. I still think some of that DNA is left in my bones. And optic nerve. I can see how it may be. But maybe not. We'll see. - - 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 23:24:54 +0200 (CEST) > To: Leica Users Group <lug at leica-users.org> > Subject: Re: [Leica] Daguerreotype Plate Sizes at 72 dpi > > De : "Mark Rabiner " <mark at rabinergroup.com> A : "Leica Users Group" > <lug at leica-users.org> Copie ? : Sujet : Re: [Leica] Daguerreotype Plate Sizes > at 72 dpi 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? France went metric at the Revolution, circa > 1789 the values of inches, feet, etc varied from one part of the country to > another - it was decided to use a common system, 1790 - then the metric > system > was adopted in 1795. At the time the Daguerotype was patented by the French > Academy of Sciences I doubt that the window panes had standardized sizes, > rather, the guys cut the glass to fit into the gap the joiners had made, by > hand ... 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) Really surprising maths WP = 354,75 cm2 HP = > 154cm2 can't be half the remainder is lost in translation :-) I'm no > scientist, I have doubts all the same here. Now about the pixels, I'm sure > that the English language version of PS allows for cms - after all don't > Canada and Australia use them on a regular basis? KISS principle > ;-) Amiti?s Philippe 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 > > Reply-To: Leica Users Group > Date: Tue, 10 Jul 2012 22:52:22 +0200 > (CEST) > To: Leica Users Group > 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 Tous vos emails en > 1 clic avec > l'application SFR Mail sur iPhone et Android - En savoir > > plus. ======================================== Message du : 10/07/2012 > > 22:04 De : "Mark Rabiner " A : "Leica Users Group" > 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/ _______________________ > > ________________________ Leica Users Group. See > > http://leica-users.org/mailman/listinfo/lug for more > > information _______________________________________________ Leica Users > > Group. See http://leica-users.org/mailman/listinfo/lug for more > information _______________________________________________ Leica Users > Group. See http://leica-users.org/mailman/listinfo/lug for more > information _______________________________________________ Leica Users > Group. See http://leica-users.org/mailman/listinfo/lug for more information