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2006-03-08 by Keith Cooper
Hi I've been having a go at using the PrintFIX PRO for luminance icc profile building and have got a short article about it at. http://www.northlight-images.co.uk/article_pages/printfix_pro_for_bw.html The improvement in BO printing with an Epson 1290 was quite noticeable (see the graph at the bottom of the page) Using Excel to handle the data might have been a bit excessive, but it did make lots of pretty graphs :-) Keith Cooper
2006-03-09 by Howard Shaw
Thanks Keith The usual way of linearising QTR curves is to insert the density or luminance figures from the 21-step into the bottom of the .qidf file. Are you using the icc profile as an additional check on this method or as a replacement for it? If the latter case could you explain why you think this use of icc profiles is a better way of linearising? Thanks Howard Keith Cooper wrote:
> Hi > > I've been having a go at using the PrintFIX PRO for luminance icc profile building and have > got a short article about it at. > > http://www.northlight-images.co.uk/article_pages/printfix_pro_for_bw.html > > The improvement in BO printing with an Epson 1290 was quite noticeable (see the graph at > the bottom of the page) > > Using Excel to handle the data might have been a bit excessive, but it did make lots of pretty > graphs :-) > > Keith Cooper >
2006-03-09 by Howard Shaw
Actually, that's a silly question because you're using the epson driver, not qtr. Let me rephrase it then - for someone with qtr would there be any benefits in this method over using a properly linearised qtr curve? Howard Howard Shaw wrote:
> Thanks Keith > > The usual way of linearising QTR curves is to insert the density or > luminance figures from the 21-step into the bottom of the .qidf file. > Are you using the icc profile as an additional check on this method or > as a replacement for it? If the latter case could you explain why you > think this use of icc profiles is a better way of linearising? > > Thanks > Howard > > > Keith Cooper wrote: >> Hi >> >> I've been having a go at using the PrintFIX PRO for luminance icc profile building and have >> got a short article about it at. >> >> http://www.northlight-images.co.uk/article_pages/printfix_pro_for_bw.html >> >> The improvement in BO printing with an Epson 1290 was quite noticeable (see the graph at >> the bottom of the page) >> >> Using Excel to handle the data might have been a bit excessive, but it did make lots of pretty >> graphs :-) >> >> Keith Cooper >> >
2006-03-09 by Steve Kale
Yes - considerable.
> From: Howard Shaw <glassman@...> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Date: Thu, 09 Mar 2006 08:12:50 +0000 > To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Subject: Re: [Digital BW] QTR icc profiles with PrintFIX PRO > > Actually, that's a silly question because you're using the epson driver, > not qtr. Let me rephrase it then - for someone with qtr would there be > any benefits in this method over using a properly linearised qtr curve? > > Howard > > Howard Shaw wrote:
2006-03-09 by CDTobie@aol.com
In a message dated 3/9/06 3:24:51 AM, glassman@... writes: > Actually, that's a silly question because you're using the epson driver, > not qtr. Let me rephrase it then - for someone with qtr would there be > any benefits in this method over using a properly linearised qtr curve? > I believe one is linearlzing the prints (your method), the other is linearizing the print preview, after the fact. C. David Tobie Product Technology Manager ColorVision Business Unit Datacolor Inc. CDTobie@... www.colorvision.com [Non-text portions of this message have been removed]
2006-03-09 by Steve Kale
Sorry maybe my earlier post was based on a misunderstanding. I meant that ideally someone using QTR should linearise their greyscale ramp (fed into the "curve") and then profile this linearised output with a QTR Create ICC profile. That is don't stop at the first step.
> From: <CDTobie@...> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Date: Thu, 9 Mar 2006 09:53:08 EST > To: <DigitalBlackandWhiteThePrint@yahoogroups.com> > Subject: Re: [Digital BW] QTR icc profiles with PrintFIX PRO > > > In a message dated 3/9/06 3:24:51 AM, glassman@... writes: > > >> Actually, that's a silly question because you're using the epson driver, >> not qtr. Let me rephrase it then - for someone with qtr would there be >> any benefits in this method over using a properly linearised qtr curve? >> > > I believe one is linearlzing the prints (your method), the other is > linearizing the print preview, after the fact. > > C. David Tobie > Product Technology Manager > ColorVision Business Unit > Datacolor Inc. > CDTobie@... > www.colorvision.com > > >
2006-03-09 by Keith Cooper
> The usual way of linearising QTR curves is to insert the density or > luminance figures from the 21-step into the bottom of the .qidf file. > Are you using the icc profile as an additional check on this method or > as a replacement for it? If the latter case could you explain why you > think this use of icc profiles is a better way of linearising? The whole point with the stuff I was describing was that I was not actually printing using QTR to print at all - it was the use of the profiles to linearise some -other- B/W printing setup. You're quite right about using the values in the curve file - that's what I'd do for printing with QTR bye for now Keith