[pure-silver] Re: estimating filter factor: gray card?
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 01 Oct 2006 21:24:14 +0200
Bruce
Thanks for letting me know. Here it is again:
Shannon
The math shown in the post is not correct. Each doubling is an f/stop. Try:
f/stop = log(filter factor)/log(2)
Filter factors of 2, 4 and 8 must return 1, 2, 3 f/stops respectively.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2006-10-01 17:28, "Camclicker@xxxxxxx" <Camclicker@xxxxxxx> wrote:
> In a message dated 10/1/2006 6:39:16 A.M. Eastern Daylight Time,
> info@xxxxxxxxxxxxxxxx writes:
>> Bruce
>>
>> I hope my note made it. I still can¹t see my own mail postings here, which
>> is very annoying, but not PureSilver¹s fault.
>>
>>
>> Regards
>>
>>
>> Ralph W. Lambrecht
>>
>> http://www.darkroomagic.com
>>
>
> I don't believe it did. I have not received any email from you and only
> PureSilver messages and I haven't seen anything directed to me.
>
> Bruce Osgood
> Camclicker @ aol.com
> Brooklyn, NY.
>
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