Re: HDR filtering

Does the following brings you further (?):
http://cinepaint.bigasterisk.com/GIMPPlugInQuickPortGuide
The blur.c plug-in is a often refered one because of its simplicity.

libcinepaint dont provides templates or any C++ stuff for the Gtk version.
The plug-in needs to handle sample types, pixel layouts and colour spaces 
by its own. 

A generic float - possibly pixel - representation was discussed in the 
past but not followed upon for this development branch.

kind regards
Kai-Uwe Behrmann
--
development for color management 
www.behrmann.name + www.oyranos.org + www.cinepaint.org


Am 05.03.07, 00:47 -0500 schrieb Normand Robert:

> Hi
> 
> I am interested in writing a filter for dealing specifically with hdr 
> images. I downloaded
> cinepaint-0.22-0_rc4.tar.gz and built it on Fedora Core 6 and modified 
> the unsharp plugin to get my feet wet. I am medical imaging researcher 
> during the day.
> 
> I do get an image but I realize that I do not understand how a plugin 
> like unsharp deals with different image types. All of the data pointer 
> are of the type
> guchar  *cur_col;
> guchar  *dest_col;
> guchar  *cur_row;
> 
>  I am puzzled as to how this code works for all of the data types 
> supported in cinepaint. In C, I would have expected the need to cast 
> data pointers to unsigned short or float etc and yet this just seems to 
> work magically for all images. In C++, I would have expected to see 
> templates or function overloading.  There is no reference to colour at 
> all in this code either so does it just get called on each colour 
> channels or I am working in a colour different representation and 
> dealing with intensity?
> 
> I hope that you will not find these questions too naive but I mostly 
> work with greyscale images in my world.
> 
> Regards
> 

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV