a nice Helicon Filter review

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lutz
Posts: 155
Joined: 14.04.2006 02:51

a nice Helicon Filter review

Unread postby lutz » 01.06.2007 22:19

Found a nice Helicon Filter review at:

http://www.photozone.de/7Digital/heliconindex.htm

Hhhmm, rather short and it does not cover many unique HF features like the retouching tab. At least they have noticed how ingenious the equalizers are.

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Dan Kozub
Posts: 1157
Joined: 24.03.2004 18:14

Unread postby Dan Kozub » 04.06.2007 20:27

Thanks, good reviews indeed. Maybe we should add true chromatic aberration filter indeed :)

firexball
Posts: 21
Joined: 07.07.2007 18:10

Unread postby firexball » 07.07.2007 19:41

Hello,
I think it would be greate, if you could add a "real" chromatic correction!!!

lutz
Posts: 155
Joined: 14.04.2006 02:51

Unread postby lutz » 09.07.2007 08:29

Hello Firexball,

have you tried the latest beta??
I personally do not need this function, but I am sure the Helicon engineers would be happy if somebody would give it real workout.

firexball wrote:Hello,
I think it would be greate, if you could add a "real" chromatic correction!!!

firexball
Posts: 21
Joined: 07.07.2007 18:10

Unread postby firexball » 09.07.2007 16:29

Hello Lutz,

I have tried the Version 4.70.1 now and saw the new Feature "Lateral CA". That is exactly what I was talking about!

But I'm sorry to say, that I'm not really satisfied with the results. :cry: I have compared the result with the "old" color method. Here are some sample Pics:

First the before and after of the new feature (200%):
Image
I have tried to reduce the CA as much as possible (parameter -2). But it seems to be a little overtuned... (and I cannot see a difference between -1 and -2).

Second the before and after of the "old" color/saturation correction:
Image
In my opinion this is not a good way to do this, because the edges are getting softer. The other disadvantage is, that the edges, which are mirrored in the window (this is a part of a building), are not corrected. I have tried different configurations but coludn't get it worked better.
So I think the new Function is maybe a step in the right direction...

Last the before and after of an other rawconverter (I don't want to say the name, because I don't want to steal Helicon customers)
Image
I don't know, why the CAs are much stronger in the bevore image (it has to be something to do with the algorithm of rawconversion). Anyway, this software has two sliders (R/C and B/Y ?) and as you can see it is posible to remove the CAs totally (as I would say).

As I know, CAs could be corrected, by scaling the color channels with different multiplier. Maybe I could get better results with finer parameter values? Maybe it should be better to control two of the three chanels seperatly?

At the end I want to emphasize, that I don't want to talk something down. I just want to help to make the product even better. :wink:
And I also know, that this is all "pixelpicking" :lol: (as a friend of mine would say).

lutz
Posts: 155
Joined: 14.04.2006 02:51

Unread postby lutz » 11.07.2007 02:34

hello Firexball,

thanks, looks like a very helpful test.

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Dan Kozub
Posts: 1157
Joined: 24.03.2004 18:14

Unread postby Dan Kozub » 11.07.2007 14:41

Hello Fireball,

I appreciate your tests very much. I had finetuned the parameters based on the images I had. I would appreciate if you can send me several your samples. I think I will make the scale more sensetive at least.

You can upload images to ftp://upload:nopassword@helicon.com.ua/httpdocs/


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