Paintings mixing system for plastic arts
Presented by: Ángela Patricia Hoyos GómezDirector: Carlos Alberto Parra Rodríguez, Electronics Engineer, PHDCollaborators: César Bustacara, Martha Manriqueand Juan Daniel Hernández Vega, Engineers.
Bachelor’s degree on Electronics Engineering final term projectSchool of Engineering, Javeriana University
Historical background about
color and technology in the field of plastic arts
Harold Cohen, former director of the CRCA at Stanford University and Aaron, his“painting-robot”
Block diagram of the system developed
Color sensor
Analysis of the color sample using Matlab-Lingo
Percentage of primary colors in the sample
hue, saturation and intensity values of the sample
Electro-mechanical systemof mixing paintings
in the three primary colors
Input : color sample selected from a virtual catalogue
16 secondary colorsand 11 thirds colors
Input : random color sample
Output: 20 ml of the painting in the same color
of the input
Methodology used Methodology used and development of the systemand development of the system
The type of painting chosen for the system
‘Ecolín’Liquid watercolor
brand
Low viscosity
Low cost $5600 per bottle of 500 cc
Easy to clean
Limitations: •To be used with watercolor paper, or cardboard•Transparency characteristicsOther possible choices:
Positive aspects of using watercolors:
primary colors CMY found
Acrylic, Gouache ,oils ,different pigments, and solvents
The HSI model related to
a traditional method of mixing paintings
2
12
1
))(()(
)()(2
1
cosBGBRGR
BRGRH
),,min()(
31 BGR
BGRS
)(3
1BGRI
Color Magenta(%) Yellow(%) red 50 50 n1 40 60 n2 30 70 n3 20 80 n4 10 90
Color Cyan (%) Yellow(%) yw 0 100 g1 10 90 g2 20 80 g3 30 70 g4 40 60
Color Cyan (%) Yellow(%) green 0 100 g5 10 90
g6 20 80 g7 30 70
g8 40 60
Color Magenta(%) Yellow(%)magta 100 0
n5 90 10n6 80 20n7 70 30n8 60 40
Color Cyan (%) Magenta(%)cyan 100 0
b1 90 10b2 80 20b3 70 30b4 60 40
Color Cyan (%) Magenta(%)blue 50 50
b5 40 60b6 30 70b7 20 80b8 10 90
Secondary colors
Numeric method of mixing paintings: Concentrations varying from 10% to 10%
Color Mapping of the samples
Detection of signals: A regular distribution of the reference signals
and other signals close to these references
The visible spectrum:Irregular distribution of the colors
in the spectrum
Color samples identification:Polygonal areas of different sizes
between the reference colors
Establishing relationships between colors
Possible development of the mixing system
Using timers and controlling the flowof the watercolor painting
Dosing system implementedtaking in account
the number of pulses discharged of each color
Using pneumatic systems
Hardware of the system implemented
PIC MicrocontrollerValves
& Pneumatic cylinders
Two 8 bits words with information about the
percentages of C,M,Y to be mixed
On/Off control signalsof the electromechanical system
Serial Tx
Feedback signals of the movement of the cylinders
Check valve
Body of the valve
Gates
Checks
Conclusions: results and initial goals
•Numerical analysis method
Initial goal, studying 16 colors => finally 48 samples of color were studied
+ A random sample of color could be mapped on the HSI color space=> This color space offers a more human perception of color than the RGB color space.
•The electromechanical system was fully developed
Precision was reached using the counting pulses method. It allows the system to extend the number of colors to be prepared. Financial costs were reduced by the design of the check valve and the use of pneumatic elements.
New questions and possible future developments
SWR and HWR: Implementing color analysis and the electromechanical system for quality control, in paintings related industries lacking of it,in Colombia - i.e Roseta Co. , IMA S.A
Research on color theory: Cross-disciplinary research group (Physics, Arts, Engineering, Medicine Schools)
References
Color chapters of booksabout image processingwww.handprint.com
Bibliographyof the course ‘Color’ of the Visual Arts Department
the world's finest guideto watercolor painting
Bruce McEvoy
PUJ Industrial Automation Technological Center
PUJ
¡Thank you!