Bill, You asked: "Is [Sylvie's] methodology similar to your [Albrecht's] multifrac technique?" PHC - Pseudo High Color (and PTC - Pseudo-TrueColor) are essentially dithering. Albrecht does not use dithering. He uses "augmented algorithms" (my term) to calculate each of his pixels. PHC is like rendering fractal A on a chess board's red squares, and fractal B on its black squares. I personally don't think the name "pseudo high color" describes the use of the technique as shown in Sylvie's examples very well. She describes using PHC to do something more like "overlaying two different images." With some work, it might be possible to use the eye's blending of the colors of pairs of adjacent pixels to carefully blend fractint's 255 available colors to have the pairs create a color "in between" those of the 255. I haven't thought about how one would go about doing that in a practical formula, though. Modern computers, displays, and fractal programs don't have the 255 color limitations that the older graphics adapter display modes originally targeted by Fractint. The code has that color depth deeply embedded in it... I eventually located Sylvie's Tutorial on pseudo high color: https://tinyurl.com/phc-tutor or: https://web.archive.org/web/20090101125929/http://spanky.fractint.org/www/fr actint/phc/phc-tutor.html Bill, You also posted: "I need to post a correction - it was actually Lee Skinner who developed the PHC methodology." Excerpt from article by Sylvie Gallet at the link above: "Pseudo-HiColor (PHC) was co-discovered by Jim Deutch, who wrote the very first PHC formula, and Lee Skinner" - Hal Lane ######################## # hallane@earthlink.net ######################## -----Original Message----- From: Fractint [mailto:fractint-bounces@mailman.xmission.com] On Behalf Of Bill Jemison Sent: Wednesday, February 14, 2018 4:18 PM To: Fractint and General Fractals Discussion <fractint@mailman.xmission.com> Subject: Re: [Fractint] InterAction An interesting image - I note that the colors are from Sylvie Gallet. As I recall, she developed a "PHC" - pseudo high color - method which allowed fractint to render "high-color" images. Is her methodology similar to your multifrac technique? Bill Jemison Audio Fractals <https://sites.google.com/site/audiofractals/home> On Wed, Feb 14, 2018 at 8:19 AM, Albrecht Niekamp <multifrac@t-online.de> wrote:
; https://1drv.ms/u/s!AmWYApv7ZBFGgZ88oN-Ce2QMjF25qg ; -------------------------------------------Start_Par--------------- 22222-53 { ; InterAction ; 5 Times Mandelbrot ; Time 0.32.27.77 ; Colors S.Gallet reset=2004 type=formula formulafile=mfr_14.frm formulaname=mfr_14_2 function=sin/exp/exp/sin passes=t center-mag=-1.23319977358200300/-0.04790860568120862/4.042717e+007/1/-12\ 1.960599442188297/1.90295706283251631 params=-0.05825983458967864/0.3785210730307932/22222.64595731338/11111.4\ 911030602/152048.0404808048/384.1604894048/384.0003500001/256.1007683001\ /512.1007683001/768.1007683001 float=y maxiter=3071 inside=maxiter periodicity=0 rseed=-2436 sound=off colors=000809<5>406306305305<3>114113013<9>041051050<4>270270280<3>4905A\ 05A0<23>MO4NO4OP5<5>RS7RT7ST8<3>TWATWAUXA<8>U`FUaFUaG<3>TcIScJScJ<5>PfMO\ fNOfO<5>KhRJhRIhSHhSHiTGiT<7>AiX9iY9jY<8>3ia3ia2ib<3>1hc1hc0hd<9>0ef0df0\ df<7>3ag3`g4`g5_g<8>AWfBVfCVfDUfDUf<9>LOcLNcMNcNMbNMbOLb<4>RI`RI_SH_<3>T\ FYTEYUEX<8>U9TU9SU8S<4>S6PS6PS5O<3>Q4MP4LP3L<4>L2IL2IK1H<11>B0BA0AA0A90A\ 809 }
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