Digital BW, The Print

Steve Kale wrote:
> Ernst
> 
> I am not sure I understand this:  what doesn't work?  What is the difference
> between trying to match a step vs a direct patch measured from the problem
> area (either lassoed or eye-dropped)?  (The reason why I am being persistent
> is because the step approach doesn't work for colour images.)
> 
> Steve
> 
> 
> 
> 
>>From: Ernst Dinkla <E.Dinkla@...>
>>Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
>>Date: Thu, 16 Dec 2004 09:19:59 +0100
>>To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
>>Subject: Re: [Digital BW] Spotting Prints
>>
>>
>>Nick H. Nugent wrote:
>>
>>>This is an excellent tip. I always fumbled around trying to create a
>>>match but this is the best technique yet. But isn't it easier
>>>to "lasso" the areas that have specs and print them onto the glossy
>>>paper as your spotting palette? This way you will have an exact
>>>match, well almost.
>>>
>>>--nick
>>
>>Have done that for spotting color prints and it doesn't work.
>>The way the inkjet heads put down a color is different to mixing
>>the same ink with a brush and applying it. It may work for quad
>>inks but I think you better use the wedge as that gives you a
>>wider range of greys to spot with.
>>
>>Prefer the drawing pens filled with inkjet inks though.
>>
>>Ernst

The way CMYK dots are laid down on the paper while printing (with 
as little bleed = dotgain as possible) is totally different to 
the way you retouche with a mix of the same ingredients. For 
example any printed color with a bit of black in it will become 
quite green when you use the same mix of ink in the brush, the 
black just bleeds into the mix in a sense.  I tried to spot a 
creme color with the same ink mix printed on PET and it just 
didn't work. My guess is that you will get that problem as well 
with quad inks but then there's just a shade shift, taking a 
lighter shade of the wedge will fix that. I don't see how you can 
do that as well with color work or you have to print a 
calibration style target to get all kinds of color shades as a 
palette for the brush. Maybe I have no painter skills :-)

I'm using Staedtler MarsMatic 700 0.25 ISO drawing pens filled 
with the cmYk inkjet inks for retouching. Stipple technique like 
in chromo-lithography. Suits me better.

Ernst