Either I just cannot find it in the docu or it is not there. 

povdoc_206.html states for image_map: 

IMAGE_MAP:
    pigment
    {
        image_map
        {
            [BITMAP_TYPE] "bitmap[.ext]"
            [IMAGE_MAP_MODS...]
        }
        [PIGMENT_MODFIERS...]
    }
BITMAP_TYPE:
    gif | tga | iff | ppm | pgm | png | jpeg | tiff | sys
IMAGE_MAP_MOD:
    map_type Type | once | interpolate Type | 
    filter Palette, Amount | filter all Amount |
    transmit Palette, Amount | transmit all Amount

The following IMAGE_MAP_MODs are recognized by POVRay and not mentioned 
in the docu: 

    repeat <u,v>
    offset <u,v>

I suggest adding them to the docu together with some explanation on 
what they are good for. 

Wolfgang

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