[pure-silver] Re: Digital Negatives from Imagesetters
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 14 Apr 2006 14:51:47 +0200
Tim
In Germany I pay 11.80 Euros for A3 and 7.80 Euros for A3, before tax (I pay
cash). Don't know the price elsewhere, but it is the same cost as one pays
for a piece of film to etch a printing plate. Very reasonable compared to
film writers and even inkjets after you considers the materials and the
usual scrap.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2006-04-14 09:40, "Tim Rudman" <tim@xxxxxxxxxxxxxxx> wrote:
> How much does it cost you for an A3 neg Ralph?
> Tim
>
>
> http://www.worldbookoflithprinting.com
>
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx
> [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Ralph W. Lambrecht
> Sent: 14 April 2006 00:06
> To: PureSilverNew
> Subject: [pure-silver] Re: Digital Negatives from Imagesetters
>
> Sorry to hear about your troubles. I had no such problems. Your description
> sounds a bit odd to me, I'm not even familiar with the terms you used (not
> in combination with halftones and imagesetters anyway).
>
> Here is how I do it:
>
> 1. Get the image on the screen to your liking.
> 2. Boost or reduce it to 450 dpi at full print size.
> 3. Run the transfer function I supply on my website.
> 4. Invert the image and save it to a CD.
> 5. Take it to the service bureau and ask for a film at 3,600 dpi with a 225
> line screen, emulsion side up.
>
> Result: a superb halftone, invisible to the naked eye, no banding, no
> mottling, and when contact printed on MG-IV-FB paper, matching the screen as
> much as technically possible.
>
>
>
>
>
> Regards
>
>
>
> Ralph W. Lambrecht
>
> http://www.darkroomagic.com
>
>
>
>
>
>
>
> On 2006-04-14 01:17, "Claudio Bonavolta" <claudio@xxxxxxxxxxxx> wrote:
>
>> Ralph W. Lambrecht a écrit :
>>
>>> To whom it may concern.
>>>
>>> I have reorganized the 'Library' section of my web page. While doing
>>> so, I've added a digital step tablet, a process checker and a
>>> Photoshop transfer function for digital negatives from imagesetters with
> brief instructions.
>>>
>>> The system work very well and produces high-quality FB prints from
>>> digital files. As always, downloads only for your own private use.
>>>
>>>
>>>
>>>
>>>
>>> Regards
>>>
>>>
>>>
>>> Ralph W. Lambrecht
>>>
>>> http://www.darkroomagic.com
>>>
>>>
>>>
>> Thanks for your contribution Ralph.
>>
>> A couple of weeks ago, I finally found an imagesetter in my area
>> (Geneva
>> - Switzerland), which wasn't that easy because they're all going CTP
>> (Computer-To-Plate) now.
>> So I designed a step tablet in Illustrator (using only the black
>> channel) with a 2% increment between each step and a 1% for the
>> darkest and lightest steps, added a 4000dpi scan of a 35mm TMX film
>> converted to a 8-bits gray scale and a pair of the common USAF1951
>> test target. I then converted it to a negative without applying any
>> curve (the objective was to trace the curve ...).
>> You can find it on http://www.bonavolta.ch/hobby/en/photo/digineg.htm
>>
>> I went to the service bureau, had to re-explain 3 times what I wanted
>> to do (I much better understand why extra-terrestrians avoid any
>> contact with humans) and we finally agreed for an A3 digital neg made
>> with a 20-microns diffusion pattern obtained directly from the AI file.
>> I suppose the 20-microns is the dot size. The finest size they can do
>> is 13-microns and that's probably what I should have asked.
>>
>> I received the neg the next day and printed it around 2:00AM (I
>> couldn't sleep anyway ...).
>> Result is disappointing: contrast is very high but this was expected
>> and can be adjusted, print is really grainy and this isn't the TMX
>> grain, but the worst, because I don't know how to cope with them, are
>> banding and some mottling in uniform areas, already visible on the
> digineg.
>> A pair of articles on how imagesetters work and their features which
>> may explain part of the problems I've had:
>> http://www.exxtra.com/imagesetters/whybetter.html
>> http://www.initpress.ru/eng/stat004.htm
>>
>> I'll try to apply your transfer curve and ask for the maximum
>> resolution but I'm afraid banding and mottling will remain.
>> Finding a good service bureau seems harder than the Graal's quest ...
>>
>> I'll be out for Easter and only be back next Tuesday.
>
>
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