Archived posting to the Leica Users Group, 2012/07/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]This just in: "Re: Half plate - exact size? Whole plate is 6.5 x 8.5 inches. Cut it in half and you get the "European Half-Plate", which is 4.25 x 6.5 inches. "American Half-Plate" is 4.25 x 5.5 inches. I don't know why the Americans went with the less-elongated format... maybe someone else can chime in." >From the internet. So it must be true. - - 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 17:52:41 -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 > > 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