Re: About digital curves

hi Nzé,

I tried to scan some gray scale prints, but it was difficult to get
linear data even if I adjust gamma.
Can I get linear date with vuescan? If I can easily get good scan
data, I can add function that semi-automatically make curve files with
scanned image.

Some people requested me DotCalc windows and OS9 version.
I just put them following URL. I fixed some localization problem and
file open dialog problems.
http://platinotype.jp/
modules.php?op=modload&name=Downloads&file=index&req=viewsdownload&sid=4
&newlang=eng

any impressions, bug reports and requests are welcome.

maru

On 2003.11.14, at 04:39 PM, nze christian wrote:

> Hello Masayuki Nishimaru,
>
> I use about the same way to do my curves before. but I give some
> platinum workshop and some of my student don't have acces to a
> densitomter so I was looking for a way to ceate curve without anything
> more than your computer and your scanner.
>
> For those who don't have a densitometer, I remember you that Vuescan
> give density file , and can be used as a densitometer.
>
>
>
> Amicalement
> best regards
>
> Nzé Christian
> mailto:christian_nze@hotmail.com
> http://www.c-nze.com
>
>
>
>
>
>> From: Masayuki Nishimaru <nisimaru@kt.rim.or.jp>
>> Reply-To: alt-photo-process-l@sask.usask.ca
>> To: alt-photo-process-l@sask.usask.ca
>> Subject: Re: About digital curves
>> Date: Fri, 14 Nov 2003 05:28:28 +0900
>>
>> Hello nze and folks,
>>
>> If you have a reflection densitometer and use Mac OS X, try my
>> software.
>> http://platinotype.jp/download/dotcalc/eng/DotCalcMacX.sit
>>
>> This software make photoshop curve.
>> You can make your own photoshop curve files for your printer in 3
>> times tests with this software.
>>
>> 1. make 101 steps gray scale negative without applying any curve.
>> 2. print with this negative, minimum exposure time you can get deep
>> black on clear film.
>> 3. read density of 100% black (d-max) and paper white with
>> densitometer
>> 4. input 100% step density and paper white then dotcalc software show
>> correct densities for each steps.
>> 5. find the steps indicate correct density
>> 6. input percent numbers where shows correct densities
>> 7. save .acv file
>> 8. open 101 steps gray scale with photoshop and apply the curve you
>> saved, and make negative
>> 9. print with this negative
>> 10. run dotcalc, load the curve file that you applied for test
>> negative
>> 11. return step5
>>
>> I can compile this software for windows or Mac OS 9, if anyone need.
>> please try.
>>
>> Masayuki Nishimaru
>> Kawasaki, Japan
>>
>
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Received on Fri Nov 14 14:22:47 2003