TYPO3 Core

Where does the path come from? Is it stored in a database record? What's the TCA of this DB field?

Here is an exampe:
This will work:
<f:image src="fileadmin/Folder_øæå/Screen_Shot_2014-04-02_at_11.29.27.png" />
This will return an error:
<f:image src="fileadmin/pages/2014/%C3%A6l%C3%A5_%C3%A5%C3%A6%C3%A6_%C3%85/Screen_Shot_2014-04-02_at_11.32.46_01.png" />

The second path is created using the FILES cObject in Typoscript (not the same exact image, but you get the point):

something = FILES
something {
  references {
    table = pages
    uid.current = 1
    fieldName = tx_boliusproducts_teaserimage
  }
  renderObj = TEXT
  renderObj{
    data = file:current:publicUrl
  }
}

Having dug through the core classes I have out that publicUrl originates here TYPO3\CMS\Core\Resource\Driver\LocalDriver. The function getPublicUrl takes an identifier and returns a string.
In the process the identifier gets rawurlencoded which results in a string that looks like the one above.

So the question is: Is the folder name supposed to be rawurlencoded? And if so, shouldn't Fluid be able to render an image from a resource-uri like the one above?
If not, then creating folders with special characters shouldn't be possible at all.

Having discussed the issue with Steffen Ritter the conclusion seems to be that publicUrl should not be used when generating images like this.
A "correct" example would/could be:

Typoscript:

something = FILES
something {
  references {
    table = pages
    uid.current = 1
    fieldName = tx_boliusproducts_teaserimage
  }
  renderObj = TEXT
  renderObj{
    data = file:current:uid
  }
}

Fluid:

<f:image src="{f:cObject(typoscriptObjectPath:'something',data:'somedata')}" treatIdAsReference="true" maxWidth="200" />

Result:

<img src="/fileadmin/_processed_/csm_Screen_Shot_2014-04-02_at_11.32.46_01_942524ab1c.png" width="200" height="125" alt="">