Archived posting to the Leica Users Group, 2012/07/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]A quick search and it seems to really be 4.25 x 5.5 inches coming from all directions on the list. - - from my iRabs. Mark Rabiner http://gallery.leica-users.org/v/lugalrabs/ > From: John McMaster <john at mcmaster.co.nz> > Reply-To: Leica Users Group <lug at leica-users.org> > Date: Tue, 10 Jul 2012 21:30:24 +0000 > To: Leica Users Group <lug at leica-users.org> > Subject: Re: [Leica] Daguerreotype Plate Sizes at 72 dpi > > Isn't half plate 4.25" x 6.5" (rather than 5.5")? > > Ah, 6.5" for glass plates and sheet film but 5.5" for tintypes - > http://en.wikipedia.org/wiki/Tintype > > Learnt something already today :-) > > john > ________________________________________ > > > Here are the Daguerreotype Plate sizes worked into pixels from the I think > original Cm sizes > Whole Plate: 6.5 x 8.5 inches (16.5 x 21.5 cm) 462 x 602 pixels > Half Plate: 4.25 x 5.5 inches (11 x 14 cm) 308 x 392 > Quarter Plate: 3.25 x 4.25 inches (8 x 11 cm) 224 x 308 > Sixth Plate: 2.75 x 3.25 inches (7 x 8 cm) 196 x 224 > Ninth Plate: 2 x 2.5 inches (5 x 6 cm) 140 x 168 > Sixteenth Plate: 1.375 x 1.625 inches (3.5 x 4 cm) 98 x 112 > > Its the cm size times 28 > > Introducing the numbers 28 and 72 to them certainly does not turn them into > any warm and fuzzy numbers. > > Here was the conversions from inches. > > 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 > > Its like translating the bible from Greek instead of Hebrew. Or whatever it > was originally written in. > > > > - - from my iRabs. > Mark Rabiner > http://gallery.leica-users.org/v/lugalrabs/ > > >> From: Mark William Rabiner <mark at rabinergroup.com> >> Date: Tue, 10 Jul 2012 17:11:27 -0400 >> To: Leica Users Group <lug at leica-users.org> >> Conversation: [Leica] Daguerreotype Plate Sizes at 72 dpi >> Subject: Re: [Leica] Daguerreotype Plate Sizes at 72 dpi >> >> Not 32 but 28 >> Conversion table >> DPI >> (dot/in) dpcm (dot/cm) Pitch (?m/dot) >> 72 28 350 >> >> " There are some ongoing efforts to abandon DPI in favour of metrication, >> giving the inter-dot spacing in dots per centimetre (dpcm) or micrometres >> (?m).[5][6] A resolution of 72 DPI for example equals a resolution of >> about >> 28 >> dpcm or an inter-dot spacing of about 350 ?m." >> >> >> - - 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 > > > 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 " <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. > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information