sorry, "Brenton"!
On Wed, Oct 15, 2014 at 9:43 PM, Robert Hanson <[email protected]> wrote:
> http://chemapps.stolaf.edu/jmol/zip/jmol-14.3.8_2014.10.15.zip
>
> Definitely better. No more stray lines if the background is transparent,
> which is what counts.
>
> Do give this a try, Rolf.
>
> Still might find more ways to tweak the Floyd-Steinberg algorithm. I might
> take a look at what GIMP does and just copy that, but this was pretty fun
> to design, I have to say.
>
> Brandon, color dithering is when the number of unique colors is reduced to
> stay within some limit (255 in this case) and adjustments are made that
> approximate colors you do not have available. Your eye merges the color
> pixels to form colors that are not actually there. Think Renoir. It is
> really quite amazing. The red, green, and blue channels are separated, and
> a clever little algorithm does some "distribution of error" to do the magic.
>
> If you compare the two webcam images at
> http://chemapps.stolaf.edu/jmol/test/dither.htm you will see almost no
> difference. (Just click the 216 or 16777216 buttons.) I had no idea this
> was possible. What I figured out there was that rather than using 8 colors,
> we could use 216 (six for each color channel). The effect is an almost
> perfect reproduction, visually.
>
> Bob
>
>
> On Wed, Oct 15, 2014 at 6:11 PM, Robert Hanson <[email protected]> wrote:
>
>> Well, dithering does produce artifacts. But they aren't visible
>> generally. If it is mangling the transparent color, though, that's
>> something I need to consider. That's probably a bug.
>>
>> On Wed, Oct 15, 2014 at 6:01 PM, Rolf Huehne <[email protected]>
>> wrote:
>>
>>> Am 16.10.14 00:29, schrieb Robert Hanson:
>>> > I don't know what the pink color is, but I'm guessing that is an
>>> > artifact of GIMP not transferring color. The dithering just can't do
>>> > that. Is what you have there, Rolf, a white background that you then
>>> > filled with color?
>>> >
>>> I added the pink color intentially as a second layer to make the dotted
>>> lines and holes better visible and then combined the two layers before
>>> saving.
>>>
>>> Regards,
>>> Rolf
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Comprehensive Server Monitoring with Site24x7.
>>> Monitor 10 servers for $9/Month.
>>> Get alerted through email, SMS, voice calls or mobile push notifications.
>>> Take corrective actions from your mobile device.
>>> http://p.sf.net/sfu/Zoho
>>> _______________________________________________
>>> Jmol-users mailing list
>>> [email protected]
>>> https://lists.sourceforge.net/lists/listinfo/jmol-users
>>>
>>
>>
>>
>> --
>> Robert M. Hanson
>> Larson-Anderson Professor of Chemistry
>> Chair, Department of Chemistry
>> St. Olaf College
>> Northfield, MN
>> http://www.stolaf.edu/people/hansonr
>>
>>
>> If nature does not answer first what we want,
>> it is better to take what answer we get.
>>
>> -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
>>
>>
>
>
> --
> Robert M. Hanson
> Larson-Anderson Professor of Chemistry
> Chair, Department of Chemistry
> St. Olaf College
> Northfield, MN
> http://www.stolaf.edu/people/hansonr
>
>
> If nature does not answer first what we want,
> it is better to take what answer we get.
>
> -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
>
>
--
Robert M. Hanson
Larson-Anderson Professor of Chemistry
Chair, Department of Chemistry
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho
_______________________________________________
Jmol-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/jmol-users
