Distance (Logarithm) test

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Offline claude

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« on: September 13, 2017, 03:17:16 PM »
Distance (Logarithm) test



https://fractalforums.org/index.php?action=gallery;sa=view;id=61

Testing the "ColorMethod: 7" corresponding to the new Distance (Logarithm) mode in the very latest Kalles Fraktaler 2 + GMP build (kf-2.11.1​+gmp​.20170913​ or later required to load this parameter correctly).

6h27m render time at 16000x9000, 105 references, image min iters 105898, series approx skip 104455

Postprocessed in GIMP (gamma 2.4, white point 240, cubic downscale to 1920x1080, export to JPEG at best quality as PNG was slightly too large to upload here).

.kfr file:
Code: [Select]
Re: -1.941563195323275091103595662130981297561744603524632904085587899999999999999999999999999999999999400
Im: -0.000121068761937254858741658175731135230541351004242361346346900000000000000000000000000000000000000
Zoom: 3.00000000000E31
Iterations: 12345678
IterDiv: 0.036000
SmoothMethod: 0
ColorMethod: 7
ColorOffset: 0
Rotate: 0.000000
Ratio: 360.000000
Colors: 255,255,255,0,0,0,64,64,128,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
Smooth: 1
MultiColor: 0
BlendMC: 0
MultiColors:
Power: 2
FractalType: 0
Slopes: 0
SlopePower: 50
SlopeRatio: 50
SlopeAngle: 45
imag: 1
real: 1
SeedR: 0
SeedI: 0
FactorAR: 1
FactorAI: 0
(also embedded as JPEG comment)

Offline Adam Majewski

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« Reply #1 on: September 13, 2017, 08:40:11 PM »
Cool
Where is the code of the method :
I have searched:
a@zelman:~/Pobrane/kf-2.11.1+gmp.20170508/kf-2.11.1+gmp.20170508-src$ grep -Rn "ColorMethod"

but can't find the method
« Last Edit: September 13, 2017, 08:52:13 PM by Adam Majewski »

Offline claude

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« Reply #2 on: September 14, 2017, 03:47:56 PM »
It's not present in that old version.  Try the latest build and source. or browse the formulas branch online at https://code.mathr.co.uk/kalles-fraktaler-2/blob/5ebdd80c5b8b19d8bf0d8f314ca2b661229797d2:/fraktal_sft/fraktal_sft.cpp#l564

Offline Adam Majewski

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« Reply #3 on: September 14, 2017, 08:37:51 PM »
ok.Thx
So difference  between stndard DEM is :
(m_nColorMethod == ColorMethod_Logarithm){                 iter = log(iter);

and :
if (m_nColorMethod = ColorMethod_DistanceLog)                 iter=log(iter+1);


Are there any more ?


Offline claude

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« Reply #4 on: September 14, 2017, 10:08:09 PM »
No, ColorMethod_Logarithm is not DEM at all, it's escape time with non-linear transfer function.

ColorMethod_Distance* have some image processing (looking up iteration values of neighbouring pixels) to generate a pseudo-de colouring.  It's not true DEM but looks pretty close sometimes.


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