Yes, you can alter an Fl_RGB_Image. Fl_RGB_Image::copy(w, h) for  
example copies an image and scales it to the desired size in one go.  
Fl_RGB_Image::desaturate() changes color values without copying the  
image. Everything you need is in the source code in src/Fl_Image.cxx .

Matthias

On 16.03.2008, at 23:31, Zoltan Phelps wrote:

> I searched the forum but didn't find any suitable thread.
> In my application i would like to show two images, one "original"  
> version and one "altered" version (e.g. after LUT conversion).
> My question is - how can i access the pixel data of an Fl_RGB_Image  
> directly? The source code reveals only the "const char * const  
> *data();" member function but as it is constant i'm not able to  
> change anything. Is there another suitable way? Or is it better to  
> just keep an unsigned char array with the pixel data, change it as  
> desired and redraw it with the fl_draw_image function without  
> creating any Fl_()_Image object? I'm a bit confused because with  
> different libraries i used to create an image object and to alter  
> its pixel data there had always been an access member function.
> Thanks in advance!
> ZP
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