It is here: Under the Magical Sky

It is here…

After a year of hard work and dedication, we are pleased to announce the launch of our first book and brand new website! Under the magical is finally here!

We are very proud of the result, excited about the future and so grateful for the opportunity to make a difference.

We are deeply passionate about creativity and arts, but can’t ignore the fact that millions of children face the least stable living and learning circumstances every day. That’s why we have decided that every time you purchase at Under the Magical Sky, we will donate to those in need.

Now, we invite you all to visit our site: https://underthemagicalsky.com/

Under The Magical Sky. By Valeria Bressan and Tauno Erik

Rembrandt Self-Portraits

0. Prologue

Here to not have all Rembrandt van Rijn self-portraits. Only these one of which there are good and large images.

1. Age of 21 or 22

1628

Image source: https://artsandculture.google.com/asset/rembrandt-laughing-rembrandt-harmensz-van-rijn/vgFXBjXYko3rWA

2.

1628-1629

Image source: https://artsandculture.google.com/asset/self-portrait-rembrandt-harmensz-van-rijn/AQHvOEXiF3p9fg

3. (copy?)

1629

Image source: https://artsandculture.google.com/asset/self-portrait-rembrandt-harmensz-van-rijn/pgESLEqtPqksZw

4. Age of 23

1629

Image source: https://artsandculture.google.com/asset/self-portrait-aged-23/VwGuMEq_Grsd-w

5.

1630

Image source: https://artsandculture.google.com/asset/selfportrait-rembrandt-harmensz-van-rijn/WAGlk3EYZbNjQQ

6.

1630-1631

Image source: https://artsandculture.google.com/asset/portrait-of-the-artist-as-a-young-man-rembrandt-van-rijn/QgEfUHzCkN472g

7.

1634

Image source: https://artsandculture.google.com/asset/self-portrait-with-velvet-beret-rembrandt-harmenszoon-van-rijn/mQGjCu2ESqQc_w

8.

1635

Image source: https://artsandculture.google.com/asset/self-portrait-with-shaded-eyes-rembrandt-van-rijn/GgEmZsdLFgLVrg

9.

1635

Image source: https://artsandculture.google.com/asset/rembrandt-and-saskia-in-the-scene-of-the-prodigal-son/fAFXpfS8tdF_Eg

It has a different pose and facial expression because it is part of a larger double portrait.

10.

1642-1643

Image source: https://artsandculture.google.com/asset/self-portrait-wearing-a-hat-and-two-chains-rembrandt-harmensz-van-rijn/MgG4MCN2pWPF6Q

11. Rembrandt with earrings

Image source: https://www.rct.uk/collection/search#/18/collection/404120/self-portrait-in-a-flat-cap

11. Rembrandt with earrings

1650

Image source: https://artsandculture.google.com/asset/self-portrait-rembrandt-harmenszoon-van-rijn/qgHjmzuyB9bkUg

There is another painting from Rembrandt Worksop (made by his pupils?) were he also wears earrings.

Rembrandt Worksop 1650

Image source: https://artsandculture.google.com/asset/portrait-of-rembrandt-rembrandt-workshop/VwH0YVIZS7toxw

12.

1652

Image source: https://artsandculture.google.com/asset/large-self-portrait-rembrandt-harmenszoon-van-rijn/dQG9VR8cLvD7EQ

13.

1658

Image source: https://artsandculture.google.com/asset/self-portrait/rgElkn0Mx7Hgnw

14.

1659

Image source: https://artsandculture.google.com/asset/self-portrait/-gHQe8vbiHn2xw

15. Age of 54

1660

Image source: https://artsandculture.google.com/asset/self-portrait-rembrandt-rembrandt-van-rijn-dutch-leiden-1606%E2%80%931669-amsterdam/yAHCmDlsTexTXQ

16.

1661

Image source: https://artsandculture.google.com/asset/self-portrait-as-the-apostle-paul-rembrandt-harmensz-van-rijn/LwGcE5lQC5dLUg

17.

1665

Image source: https://artsandculture.google.com/asset/portrait-of-the-artist-rembrandt-van-rijn/QgHkNBGhrxU0Ww

18. Age of 63

1669

Image source: https://artsandculture.google.com/asset/self-portrait-rijn-rembrandt-van/QgHA3WPpbgKD6g

1669

image source: https://en.wikipedia.org/wiki/Self-portraits_by_Rembrandt#/media/File:Rembrandt_Harmensz._van_Rijn_135.jpg

Ambient light sensor TEMT600

TEMT6000 is ambient light sensor. It is sensitive to visible light much like human eye and has peak sensitivity at 570nm.

Visible spectrum is 390 – 700 nm.

TEMT6000

The sensor can handle voltages from 3.3v and 5v. The sensor has been designed into a voltage divider circuit. To read that voltage connect SIG pin to any analog to digital conversion pin on microcontroller.

Ambient light sensor for control of display backlight dimming in LCD displays and keypad backlighting of mobile devices and in industrial on/off-lighting operation.

TEMT6000 measures illuminance (measured in lux (lx). It is a measure of the total quantity of visible light emitted by a source (referred to as luminous flux, measured in lumens (lm) divided by an area in square meters. 1 lx = 1lm/m2.

Image: Sparkfun

To get the brightness the sensor measures, we then simply have to measure the voltage on the SIG (also called OUT) pin using the Analog To Digital Sensor and convert those voltage measurements to illuminance values in lux.

To get the illuminance in lux, we first need to convert the measured voltage to the current flowing across the TEMT6000 sensor. This current is also equal to the current flowing across the 10kΩ resistor in the voltage divider circuit, which is I = adc_value/10000kΩ.

Volts = analogRead() * 0.5 / 1024.0

Amps = volts / 10000.0

microamps = amps / 1000000

lux = microamps *2.0

float lux = analogRead(TEMT6000_PIN) * 0.9765625; // 1000 / 1024 = 0.9765625

The datasheet for the TEMT6000 specifies a proportional correlation between current and illuminance: Every 2 µA of current correlates to 1 lx in the illuminance.

Code

I’m using Visual Studio Code + PlatformIO. Arduino Uno

#include <Arduino.h>

#define TEMT6000_PIN A0 

void setup() {
  pinMode(TEMT6000_PIN,  INPUT);    
  Serial.begin(9600);
}

void loop() {
  float reading = analogRead(TEMT6000_PIN); //Read light level
  Serial.print("Reading: "); Serial.println(reading);

  double volts = reading * 5.0 / 1024.0;
  Serial.print("Volts: "); Serial.println(volts);

/*
  In the case of 8-bit AVR Arduino boards, 
  the float type is 32-bits 
  which makes the limit 6 or 7 digits.

  double amps = volts / 10000.0; // = 0
  Serial.print("Amps: ");Serial.println(amps);

  double microamps = amps / 1000000; // = 0
  Serial.print("Microamps: ");Serial.println(microamps);

  double lux = microamps * 2.0; // = 0
  Serial.print("Lux: "); Serial.println(lux); 
*/
  Serial.print("Lux: ");
  float lux2 = analogRead(TEMT6000_PIN) * 0.9765625; // 1000 / 1024 = 0.9765625
  Serial.println(lux2);
  Serial.println("");

  delay(1000);
}

Demo:

Links:

Translations:

  • illuminance (lux = lumens/m2) – valgustatus
  • luminous – helendav, valgusküllane
  • luminous flux (lumens) – valgusvoog
  • luminous intenity (candela) – valgustugevus
  • luminance (candela m3) – heledus, eredus
Fotomeetria

Exercising portrait painting

The background are gold with gold leaves. This is already second layer and when it is dried up i my add the glazes.