Excellent. That's what I wanted to know :-)
On Thu, Aug 6, 2009 at 4:01 PM, <rocon...@theorem.ca> wrote: > On Thu, 6 Aug 2009, rocon...@theorem.ca wrote: > >> On Thu, 6 Aug 2009, Jeff Heard wrote: >> >>> I was wondering if Data.Colour supported Double-valued colour >>> components > 1.0 or less than 0. I'm looking to create an HDR image >>> processing library, and Haskell has one of the most extensive and >>> correct colour models around, thanks to Russell. With 16bpcc or >>> 32bpcc images, however, I need to be sure to be able to correctly >>> calculate colour values that fall outside the usual [0.0,1.0] gamut. >>> Does Data.Colour support this functionality? >> >> Data.Colour supports values outside the range [0,1] for most computations. > > To be slightly more techinical, I want add that Data.Colour.Colour is > abstract and its interface cares nothing about [0,1]. Gammut issue only > arise when converting the abstract data type to and from concrete > coordinates, and which colours are outside [0,1]*[0,1]*[0,1] is coorinate > system dependent. Since Data.Colour.Colour is abstract and coordinate > system indepenent, it cannot (or at least should not) care about such issues > for oprations that deal only with abstract colours (operations such as > blending, etc.) > >> Components are clamped when extracting to Bounded component types such as >> Word8 (see toSRGBBounded). There may also some issues with negaive values >> when converting to non-linear coordinate systems via a transfer function. >> This is an area I haven't thought to much about, so there could be a few >> "bugs" lurking here. If found they should be fixed, assuming "right" >> behaviour can be found. >> >>> >>> -- Jeff >>> _______________________________________________ >>> Haskell-Cafe mailing list >>> Haskell-Cafe@haskell.org >>> http://www.haskell.org/mailman/listinfo/haskell-cafe >>> >> >> > > -- > Russell O'Connor <http://r6.ca/> > ``All talk about `theft,''' the general counsel of the American Graphophone > Company wrote, ``is the merest claptrap, for there exists no property in > ideas musical, literary or artistic, except as defined by statute.'' > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe