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2005-02-03 by jsigmonmd24
Anyone know the appropriate papersetting/curve setting when using epson prem luster or prem semimatte paper with QTR. Should I use the ilford smoothpearl setting, one of the epson settings, velvet? Just thought I'd save myself some paper if someone has some info
2005-02-03 by Steve Kale
Try the Ilford Smooth. But it is worth understanding what a QTR curve is a little more because (you have a great printer and) ideally you would have a curve linearised for that specific paper (and your specific printer). Take a look at one of the ink descriptor files (.txt) and then look at its .quad file. The .txt file is how you instruct QTR to create a set of lookup tables - the .quad file - for a specific ink/paper combo. In essence, QTR for each file pixel value looks up the tables and fires each ink according to the % indicated in the lookup table (expressed as an 8 bit number). When you do an ink descriptor file you tell QTR which inks are going to be used to make up the greyscale (eg K and LK combined with LM and LC to cool the LK down => UC_Neutraliser=yes), what the ink limits are and at what point are the cross-overs, and importantly, at the end you linearise this, meaning you want nice even steps in Lab's luminance from paper white to ink black. Combine this nicely linearized greyscale output with Roy's perceptual rendering and you have a sweet workflow.
> From: jsigmonmd24 <jsigmonmd24@...> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Date: Thu, 03 Feb 2005 17:00:22 -0000 > To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Subject: [Digital BW] QTR paper settings for Esemimatte or prem luster > > > > > > Anyone know the appropriate papersetting/curve setting when using epson prem > luster or > prem semimatte paper with QTR. > > Should I use the ilford smoothpearl setting, one of the epson settings, > velvet? > > Just thought I'd save myself some paper if someone has some info > >
2005-02-03 by jsigmonmd24
Steve, Thank you very much. You have no idea how much your input/instruction is appreciated! Jason --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale <stevekale@b...> wrote:
> Try the Ilford Smooth. > > But it is worth understanding what a QTR curve is a little more because (you > have a great printer and) ideally you would have a curve linearised for that > specific paper (and your specific printer). Take a look at one of the ink > descriptor files (.txt) and then look at its .quad file. The .txt file is > how you instruct QTR to create a set of lookup tables - the .quad file - for > a specific ink/paper combo. In essence, QTR for each file pixel value > looks up the tables and fires each ink according to the % indicated in the > lookup table (expressed as an 8 bit number). When you do an ink descriptor > file you tell QTR which inks are going to be used to make up the greyscale > (eg K and LK combined with LM and LC to cool the LK down => > UC_Neutraliser=yes), what the ink limits are and at what point are the > cross-overs, and importantly, at the end you linearise this, meaning you > want nice even steps in Lab's luminance from paper white to ink black. > Combine this nicely linearized greyscale output with Roy's perceptual > rendering and you have a sweet workflow. > > > >
2005-02-03 by Steve Kale
You are welcome. BTW I should have said 16 bit not 8 bit. Poke around under the hood a little and things will begin to click. Also run the Graph Curve programme that Roy has (I think it is still in the current download set). You just launch it and then drag a .quad file (from your CurveDropBox under the app CurveDesign...Mac users) into the window and then hit return. Look at the chart. It shows you how each of the inks is behaving for values from paper white at the top of the Y axis to black at the bottom.
> From: jsigmonmd24 <jsigmonmd24@...> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Date: Thu, 03 Feb 2005 18:12:19 -0000 > To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Subject: Re: [Digital BW] QTR paper settings for Esemimatte or prem luster > > > > Steve, > > Thank you very much. You have no idea how much your input/instruction is > appreciated! > > Jason