How to use blend modes to make better images ( of Mandelbrot sets and …)
These images are inspired by great technique used by Adam Saka in KFMovieMaker and his videos

Results: A picture is worth a thousand words

Algorithm

Blend modes

Blend types (= modes) definition


typedef enum  {
    no = 0,
    average = 1    
        } BlendType;

How to compute blended color from 2 input colors ? Here color is a single number (shades of gray)

Basic is average

unsigned char GiveBlendedColor( double c1, double c2, BlendType Blend){
    unsigned char t;
    switch (Blend){
        case average: {t = (c1+c2)/2.0; break;}
        default: {}
    }
    return  t;
}

There are many blend modes

photoshop

potential (Linear step) plus slope

Here exterior of the Mandelbrot set is:

described by potential
coloured with 1D gray gradients

Interior is solid colour blue

First image is slope ( normal map = Lambert reflection (Illumination model or shader )

Second image:

level sets of potential
linear step function

3-rd image = Result of blending above images in average mode

Potential ( sqrt step ) + slope

First image is the same as above = ( normal map = Lambert reflection (Illumination model or shader )

Second image:

level sets of potential
sqrt step function. It is inverterd

 p = 1.0 - p;

3-rd image = Result of blending above images in average mode

program

c console program for creating static images (png)

dependencies

bash
gcc
GNU Make
OpenMP
Image Magic convert ( from ppm to png )

to run

make

licence

LICENCE

git

git init
git add README.md
git commit -m "first commit"
git branch -M main
git remote add origin git@github.com:adammaj1/Mandelbrot-set-with-blended-gradients.git
git push -u origin main

local repo: ~/Mandelbrot-set-with-blended-gradients