Topic: About Maps

Hello,
i find IA is an interesting proramm, there are several menu options where i can "make" different type of "maps" . But for what are these maps usefull or nessesary?

Are the some Tutorials or explanation for what i can use these maps?

greets

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Re: About Maps

The maps in IA are 64bit grayscale floating point images (actually complex valued if produced by a Fourier transform).
They can be used if you need to work in really high precision or if you need to exchange data values with e.g. Matlab or Excel. This is mostly for scientific computing application and not really "normal" photo editing.

Michael Vinther

> software developer <

Re: About Maps

ok, i thought i could use it to make a map and then reload it to use other functions of IA on this map.

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Re: About Maps

I'm not sure I understand your comment, but you can both save and load the map file format in IA.
Not all filters in IA are implemented for this high precision format so you will not be able to use all the features of IA on maps.

Michael Vinther

> software developer <

Re: About Maps

I mean this maps (i didnt find somethink in the internet help file of IA)

Operations > Transformations > FourierTransform
Operations > Transformations > Discrete Cosine Transform
Operations > Transformations > Distance Transform
Operations > Transformations > Statistics Map

for what are these maps good and could i use them in IA when i made one of the maps of an Image?


I ask because like i sawed is the deph map the only one which could loaded in IA .

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Re: About Maps

The Fourier Transform (and probably also Discrete Cosine Transform) can be used to remove pattern noise (e.g. moire) using the eraser tool. See e.g. http://www.oocities.org/~chengye/notch.html
The other map functions you mention are only for analysis.

Michael Vinther

> software developer <

Re: About Maps

ok thanks for the link.

There is said they used a notch filter, where can i find this Notch filter in the FFT-Menu ?

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Re: About Maps

Basically it is just the eraser tool. You can erase certain frequency peaks and then do the inverse transform.
Alternatively you can use the "Frequency domain filter" directly on the image.

Michael Vinther

> software developer <

Re: About Maps

I've been looking for the info this link all over internet. Thanks a lot guys!

10 (edited by deltaelite 2012-03-12 15:58:18)

Re: About Maps

that link was good and now i understand how to work with the FFT to remove noise patterns.
An interesting thing is pattern matching with FFT,
http://homepages.inf.ed.ac.uk/rbf/HIPR2/freqfilt.htm

But is there a documentation how  to work with the frequency domain filter exactly in IA?
i recognised that the FD.filter is only/most sensitive on the middle top,
and it is difficult to use because in this area it is recommend to delete only a very small amount of pixels.
Otherwise the image looks like solarised and inverted (tested on BW-image)

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Re: About Maps

Usually you will use the frequency domain filter to remove noise that is fairly high-frequent, and this will show up as dots on the frequency image. These dots can be erased in the window.
I just found this post in another forum: http://www.elementsvillage.com/forums/s … p?p=349024

Michael Vinther

> software developer <

12 (edited by deltaelite 2012-03-18 19:17:16)

Re: About Maps

that was a nice Tutorial, but one of the User made a real good Image with IA
but i didnt get the same result with only the "median Filter" of IA.
Did you know what Filter i should use instead or combination?
http://www.elementsvillage.com/forums/s … ostcount=6
the Image is smoothed but the details arent lost.

greets

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Re: About Maps

I'm sorry, but I don't understand what you mean. It is an example of using the frequency domain filter which was what you asked for, and there is no mentioning of the median filter in that post.

Michael Vinther

> software developer <

14 (edited by deltaelite 2012-03-21 5:10:21)

Re: About Maps

I was wondering how did he get the result (which filter was used?).

with only the frequency domain filter the picture looks like this:
http://www.pixentral.com/show.php?pictu … AOETN49M90

but how could i get this result?
http://www.pixentral.com/show.php?pictu … ZVmDVf8NFs

the picture looks smoothed but with no loss in details and the skin looks
color corected. The skin isnt so much red like before.
I tried to use the median filter to get the same result with all possible combinations , but with no luck.
The details got lost. I tried the Smooth filter, the adaptive noise filter, the adaptive smooth/sharpen filter and the median filter.
Maybe he used another filter in IA or how do i get this look?

ok, i got a bit further with the skin color.
i used the Colorbalancer in Lab Mode.
Here are the Pics how far i came to reproduce the image of this forum.

http://img213.imageshack.us/img213/6678/step2p.jpg

Uploaded with ImageShack.us

greets

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Re: About Maps

Ok i got now the answer to this mystery image,
when it looks like it was photoshopped, it was photoshopped!

just normal dodge and burn in PS.

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