Re: [Haskell-cafe] Colour tutorial (Was: AC-Vector, AC-Colour and AC-EasyRaster-GTK)
On Fri, Jul 10, 2009 at 12:42 AM, rocon...@theorem.ca wrote: On Thu, 9 Jul 2009, rocon...@theorem.ca wrote: You can use by lib without worrying about the CIE. You can use my library without ever importing or using the word CIE. However, the CIE stuff is there for those who need it. Perhaps I (maybe with some help) need to make a tutorial on the haskell wiki to try to make it less intimidating. Okay, I threw together a quick introduction at http://www.haskell.org/haskellwiki/Colour. Any changes, comments, corrections, and addtions are welcome. It's a wiki! The word CIE does occur at all in the document. I read this and it irks me that opaque is not a monoid homomorphism despite being the natural injection of non-transparent colours into semi-transparent colours with pureColour being the projection back. [Incidentally, you have a typo in pureColour, ac `over` mempty should be ac `over` black or opaque black presumably, or even opaque mempty, which I think was what you were going for, illustrating my point.] It's like defining mappend on Integers as (+) and on Reals as (*); actually, I think this is very close to what is actually happening. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Colour tutorial (Was: AC-Vector, AC-Colour and AC-EasyRaster-GTK)
On Sat, Jul 11, 2009 at 12:54 PM, Derek Elkinsderek.a.elk...@gmail.com wrote: On Fri, Jul 10, 2009 at 12:42 AM, rocon...@theorem.ca wrote: On Thu, 9 Jul 2009, rocon...@theorem.ca wrote: You can use by lib without worrying about the CIE. You can use my library without ever importing or using the word CIE. However, the CIE stuff is there for those who need it. Perhaps I (maybe with some help) need to make a tutorial on the haskell wiki to try to make it less intimidating. Okay, I threw together a quick introduction at http://www.haskell.org/haskellwiki/Colour. Any changes, comments, corrections, and addtions are welcome. It's a wiki! The word CIE does occur at all in the document. I read this and it irks me that opaque is not a monoid homomorphism despite being the natural injection of non-transparent colours into semi-transparent colours with pureColour being the projection back. [Incidentally, you have a typo in pureColour, ac `over` mempty should be ac `over` black or opaque black presumably, or even opaque mempty, which I think was what you were going for, illustrating my point.] It's like defining mappend on Integers as (+) and on Reals as (*); actually, I think this is very close to what is actually happening. I'm mistaken about the typo in pureColour, but luckily the mistake just further illustrates my point. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Colour tutorial (Was: AC-Vector, AC-Colour and AC-EasyRaster-GTK)
On Fri, Jul 10, 2009 at 6:42 AM, rocon...@theorem.ca wrote: On Thu, 9 Jul 2009, rocon...@theorem.ca wrote: You can use by lib without worrying about the CIE. You can use my library without ever importing or using the word CIE. However, the CIE stuff is there for those who need it. Perhaps I (maybe with some help) need to make a tutorial on the haskell wiki to try to make it less intimidating. Okay, I threw together a quick introduction at http://www.haskell.org/haskellwiki/Colour. Any changes, comments, corrections, and addtions are welcome. It's a wiki! Excellent! I admit to being Quite Baffled by the new terminology when I tried using this library a few months ago. Spent a lot of time on WP trying to find out what everything was! Even something as simple as stating yes, just use Colour Double makes the library seem a lot easier to plumb in to other things. A couple of notes: Section 4.2: Out of gamut channels be clamped to either to the range 0 to 255 -- some kind of mix-up here Section 5: Note that\n\nOne should avoid dissolving has a spurious line break, or an unfinished sentence. Cheers, D -- Dougal Stanton dou...@dougalstanton.net // http://www.dougalstanton.net ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Colour tutorial (Was: AC-Vector, AC-Colour and AC-EasyRaster-GTK)
On Thu, 9 Jul 2009, rocon...@theorem.ca wrote: You can use by lib without worrying about the CIE. You can use my library without ever importing or using the word CIE. However, the CIE stuff is there for those who need it. Perhaps I (maybe with some help) need to make a tutorial on the haskell wiki to try to make it less intimidating. Okay, I threw together a quick introduction at http://www.haskell.org/haskellwiki/Colour. Any changes, comments, corrections, and addtions are welcome. It's a wiki! The word CIE does occur at all in the document. -- 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
