Re: Newcomer w/ laundry list...

[Alfredo Mateus <almateus@globalsite.com.br>]

Broker wrote:
> 
> Hi all,
> 
> I just joined the group  (and hope I'm mailing this to the right address).
> I didn't see the address for posting to the list in the welcome message.

The address is ff@aurdev.com (you sent it to the address to reach the
owner of the list (me), owner-ff@aurdev.com)
> 
> With respect to Jenn's question on who is www.netins.net, a freeware
> program  (WhoIs204.zip)  I just recently downloaded from
> http://members.xoom.com/LunaSoft/ provided this (and more) information:
> 
> Registrant:
> netINS, Inc. (NETINS-DOM)
>    4201 Corporate Drive
>    West Des
> Moines, IA 50265-0110
>    US
>  Domain Name: NETINS.NET
>  Administrative
> Contact, Technical Contact, Zone Contact:
>       netINS Network Operations
> Center  (INS-NOC)  noc@NETINS.NET
>       800-205-1110
> Fax- 515-830-0345
> 
> Billing Contact:
>       Eggley, Michael  (ME2555)  mse@NETINS.COM
> 
> (515) 830-0110 (FAX) (515) 830-0123
>
The page is Steve Fisher's page. Steve, where are you, it's been some
time since your last post. Your page keeps growing though...
 
> ---     Thank you Werner and Tatsuya for the great tutorials on FF.  They really helped to launch me!  I'm grateful.
> 
> ---      The contest looks interesting...I'm thinking about submitting.
> 
> I've been experimenting with Filter Factory for about a month.  I'm
> fascinated by the mathematics involved [not that I understand it :-(], and so most of my work is shoot from the hip, trial and error.  I'd like to  compile a booklet of my experiments to see if I can understand how the  functions are related to the output.  Right now I copy/paste the FF formula  into the PS caption area and manually enter the  slider values and  comments.  Then I save the file as the smallest possible JPEG.  This way I  can always easily regenerate the uncompressed image by rerunning the  filter, and in the meanwhile my very small jpg will serve as a close  approximation.  Of course, I am only doing FF formulas--if I were doing  something more complex it wouldn't work as well.
> 
Feel free to share your experiences and questions here, this is THE
place to find answers.


> Question:  I still struggle with inaccurate preview windows.  I've read  Mario's comments in the FFPG, and I still don't get it.  Can any FF program  create an accurate preview window if coded properly?  I'd sure like some  assistance in that area!
> 
Yes, FF can make accurate previews for any size of image. You just have
to take care to scale things. Let's say you type this code:

R: x
G: x
B: x

If your image is 256 pixels wide, you should see a gradient from black
(x=0) to white (x=255).  If your image is 400 pixels wide, you will see
a gradient from black to white and then a white bar on the right,
starting on the pixel 255 up to the pixel 399, since FF cannot assign a
value greater than 255 for the color. How do you get around this? You
use the scale function:

R:G: and B: scl(x,0,X,0,255)

You can read this as "take x and scale it from 0 to X (the width of the
image) to from 0 to 255. This will give you the correct b/w gradient for
a picture with any width. Of course other codes will be much harder to
scale, and maybe you already knew this, bnut it is a start. Hey, this is
not that much math! You don't need to know integrals and derivatives to
create a filter!

> Question:  What is UF?, FM?  What other softare is there that is similar to FF?

UF = ultimate filter
FM = filter meister
FiFo = filter formula

I will let the authors explain them.


Alf
> 
> I'm going to be travelling over the next 3 weeks, so my participation may be spotty.  But, I'll be back.  Thanks for the opportunity to share info.
> 
> Broker