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Op 10/02/2022 om 19:31 schreef Kenneth:
> Thomas de Groot <tho### [at] degroot org> wrote:
>>
>> Not the same, but this reminds me of Kenneth's airbrush technique
>> (2008, iirc). I am unable to find the exact post here.
>> ...
>> I was thinking this:
>>
>
> Sorry for not posting here earlier; I was totally absorbed in running camera
> 'normal' experiments.
>
> Hmm, I don't remember posting those images, although they look like the
> experiments you and I did in my long-ago post (the one that Yadgar referenced).
> Perhaps from a different 'Kenneth'? I searched all of the image posts for 2008
> and didn't see another fellow by that name. TWO users named Kenneth??
> Impossible! :-P
>
Sorry, a little misunderstanding here. The images were by me; the
technique was yours ;-)
Probably what Yadgar mentioned. Must have been around July 2008...
> Anyway...I really like these spiral experiments. I was thinking about the
> earlier suggestion of somehow using the technique to reproduce a full-color
> photo-- perhaps by making separate spirals of the image's 3 separate color
> channels (with the spirals colored red/green/blue), but having different
> spacings or gaps between the spirals so that they sort of 'blend together' in
> the viewer's eye. I haven't thought this through in detail, though. By using
> different spiral 'frequencies? Maybe it's not possible geometrically.
>
By using eval_pigment perhaps, or a pigment function, to evaluate the
colour, then using the result to change the colour of the individual
cones in the spiral...?
--
Thomas
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Op 11/02/2022 om 08:20 schreef m@b:
> On 06/02/2022 11:22 pm, David Buck wrote:
>> This makes me wonder if you could get the illusion of a full-color
>> image by having three spirals - one red, one green and one blue - that
>> are separate but which spiral out together.
>>
>> David
>
> It's quick and dirty, but here it is, 3 spirals, one red, one green and
> one blue:
Yes! Excellent!
I wondered earlier, in my answer to Kenneth here, if it would be
possible to tint differently individual cones in a spiral? That way only
one spiral would be needed, but I guess that is not allowed.
--
Thomas
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"m@b" <sai### [at] googlemailcom> wrote:
> On 06/02/2022 11:22 pm, David Buck wrote:
> > This makes me wonder if you could get the illusion of a full-color image
> > by having three spirals - one red, one green and one blue - that are
> > separate but which spiral out together.
> >
> > David
>
> It's quick and dirty, but here it is, 3 spirals, one red, one green and
> one blue:
It worked! That is really cool.
I half-thought that the solution might be to simply scale each successive spiral
slightly larger. But instead, it looks like each spiral begins (in the center)
at 120-degree rotations from each other. Great! I imagine that *more* than 3
colors could be used with the same technique, by simply dividing-up the
rotations differently (and making the spirals appropriately thinner, maybe.)
Like, 6 spirals-colors would use 360/6 rotation adjustments.
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Wow. I think that works really well. If you look closely, you just see
red, green and blue but an overall glance gives you subtle shades of
color. Cool!
David Buck
On 2022-02-11 2:20 a.m., m@b wrote:
> On 06/02/2022 11:22 pm, David Buck wrote:
>> This makes me wonder if you could get the illusion of a full-color
>> image by having three spirals - one red, one green and one blue - that
>> are separate but which spiral out together.
>>
>> David
>
> It's quick and dirty, but here it is, 3 spirals, one red, one green and
> one blue:
Post a reply to this message
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David Buck <dav### [at] simberoncom> wrote:
> Wow. I think that works really well. If you look closely, you just see
> red, green and blue but an overall glance gives you subtle shades of
> color. Cool!
Right, I saw this effect a while ago, and hadn't gotten around to posting it.
Now it seems like it might have some utility to inspire some experimentation.
:)
https://petapixel.com/2019/07/31/this-black-and-white-photo-uses-color-grid-lines-to-trick-your-brain/
Pretty cool effect / illusion.
I wonder if all 3 spirals could be coincident or layered with rgbf pigments.
Also wondering what a single spiral of closely arranged spheres would look like
with full rgb pigmentation of each individual sphere...
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On 2022-02-06 11:22 (-4), David Buck wrote:
> This makes me wonder if you could get the illusion of a full-color image
> by having three spirals - one red, one green and one blue - that are
> separate but which spiral out together.
Turns out it wasn't so difficult.
The file sizes for these things are tricky. Quite often, the PNGs are
smaller than the JPEGs, though I can /sometimes/ get the JPEGs smaller
by using compression 75.
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Attachments:
Download 'me-pats-cspiral.png' (240 KB)
Preview of image 'me-pats-cspiral.png'
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