Re: About Averaging
Re: About Averaging
- Subject: Re: About Averaging
- From: edmund ronald <email@hidden>
- Date: Mon, 23 May 2011 16:04:59 +0200
Ernst,
Some of us are struggling with contamination issues where the target is
getting damaged by ink coming off transport rollers. As you know this
happens with printers but also with iSis, and here reading the same physical
squares twice doesn't help.
Edmund
On Mon, May 23, 2011 at 3:41 PM, Ernst Dinkla <email@hidden>wrote:
> On 05/23/2011 02:54 PM, edmund ronald wrote:
>
>
>> A cheap way to improve your profile by averaging is probably to print at
>> least 4 rotated scrambled versions of your target in different places on
>> the
>> sheet, and average the measurements of those sheets.
>>
>> Edmund
>>
>
> I suggested to create a target sheet and patch distribution that allows
> spectrometer scanning in two directions. That does not have to be a
> topological miracle but the right margins and an extra table of reference
> data should be enough. It can deal with the paper texture (scan direction)
> and print direction (inkjet) artefacts. Must be cheaper than printing the
> target twice.
>
> With printer integrated spectrometers the print width differences could
> either be positive or negative if the patches are spread on the paper roll
> width. The HP Z models allow that. I doubt they show much variation over the
> print width though, they only know a bidirectional print mode and if ink
> feed starvation or heads hotting up play a role then the minimal patch width
> of 14 mm (square) 16mm (hexagonal) should compensate that. There is more
> integration happening too with that spectrometer not so close to the media.
>
>
> --
> Met vriendelijke groeten, Ernst
>
>
> Dinkla Gallery Canvas Wrap Actions
>
>
> | Dinkla Grafische Techniek |
> | www.pigment-print.com |
> | ( unvollendet ) |
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