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Invalid curve produces very dark output

Invalid curve produces very dark output

2016-11-08 by jeff.grant@...

In experimenting with Richard's linearisation process, I managed to generate a curve for my 3880 with OR and GR after the valid inks. They had values of 0 in each position. The result of printing with this curve is that QTR produces very dark prints across the full range.


I know that I shouldn't get the curve wrong and that QTR has no way of posting an error but, should QTR ignore inks that aren't identified in the Quad header?


Cheers,


Jeff

Re: [QuadtoneRIP] Invalid curve produces very dark output

2016-11-09 by Roy Harrington

The dark print is because QTR driver is rejecting the curve. Or and gr are illegal for 3880.
Roy
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On Wednesday, November 9, 2016, jeff.grant@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:


In experimenting with Richard's linearisation process, I managed to generate a curve for my 3880 with OR and GR after the valid inks. They had values of 0 in each position. The result of printing with this curve is that QTR produces very dark prints across the full range.


I know that I shouldn't get the curve wrong and that QTR has no way of posting an error but, should QTR ignore inks that aren't identified in the Quad header?


Cheers,


Jeff





--
Sent from Gmail Mobile

Re: [QuadtoneRIP] Invalid curve produces very dark output

2016-11-09 by richard@...

I spoke to Jeff privately about this yesterday, but wanted to respond here as well. There are instructions in the template and a button in the QuadLin interface to clear the existing quad values before pasting in the ones you want to linearize. I am working on an update that will use a method of parsing the ink list in the header info to count the number of inks used rather than the way it counts the number of lines in the original quad values. I'm also going to start shipping it without some of the dummy data in the inputs to cut down on these kinds of surprises...

Richard Boutwell

http://www.richardboutwell.com/

Re: Invalid curve produces very dark output

2016-11-09 by brian_downunda@...

Since it was I who encouraged Jeff off-forum to ask his question, I feel I should add something. I took a look at the .quad file in question and was puzzled why QTR behaved the way it did. The header line in the .quad lists the eight inks in the correct order, and I'd have thought that QTR should either refuse to print with an invalid curve, or ignore the surplus two ink positions, since the header line only lists eight. It's not a major issue once you realise the source of the problem, but it struck Jeff and I as odd behaviour by QTR.

Re: [QuadtoneRIP] Invalid curve produces very dark output

2016-11-09 by Walker Blackwell

QTR on Mac actually does ignore the last two if not delineated above on first line (although QTR curve viewer does not).

Permissions issues and wrongly encoded .quads will also make this happen. This can be related to people's various versions of excel and encoding preferences, file name length, default permissions, etc. basically a support can of worms. Don't say I didn't warn anyone.

Best,
Walker
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On Wednesday, November 9, 2016, brian_downunda@yahoo.com [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:

Since it was I who encouraged Jeff off-forum to ask his question, I feel I should add something. I took a look at the .quad file in question and was puzzled why QTR behaved the way it did. The header line in the .quad lists the eight inks in the correct order, and I'd have thought that QTR should either refuse to print with an invalid curve, or ignore the surplus two ink positions, since the header line only lists eight. It's not a major issue once you realise the source of the problem, but it struck Jeff and I as odd behaviour by QTR.

Re: [QuadtoneRIP] Invalid curve produces very dark output

2016-11-09 by jeff.grant@...

Walker,

Just to be clear, this was a question about QTR and not any other software product, and this is the QTR forum, is it not? If you want to take cheap pot-shots, you need to take better aim. As for the comment "QTR on Mac actually does ignore the last two ...", this was QTR on a Mac.

Cheers,
Jeff

Re: [QuadtoneRIP] Invalid curve produces very dark output

2016-11-09 by forums@walkerblackwell.com

sorry. Did not mean to offend. My emotions are entirely raw today.

I should give myself a no-email reminder on days like these.

best all,
Walker
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> On Nov 9, 2016, at 6:19 PM, jeff.grant@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> Walker,
> 
> 
> Just to be clear, this was a question about QTR and not any other software product, and this is the QTR forum, is it not?  If you want to take cheap pot-shots, you need to take better aim.  As for the comment "QTR on Mac actually does ignore the last two ...", this was QTR on a Mac.
> 
> Cheers,
> Jeff
> 
>

Re: [QuadtoneRIP] Invalid curve produces very dark output

2016-11-10 by James Irelan

Nearly half the country is.


James
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> On Nov 9, 2016, at 6:51 PM, jeff.grant@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
>
> Thanks Walker, I can understand that you are in a state of shock today. I certainly am.
>
>
> Cheers,
> Jeff
>
>

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