<< Chapter < Page Chapter >> Page >
Introduction on how images and sounds are represented (including colors and coordinates) in processing.

Visual elements

Coordinates

In Processing, the representation of graphic objects is based on a cartesian 3Dcoordinate system, as displayed in [link] .

Coordinate system

3D coordinate system used in Processing
2D images are processed by acting on the X-Y plane, thus assuming that the Z coordinate is zero. The function size() defines the display window size and the rendering engine that will be used to paint onto the window. The default engine is JAVA2D, the 2Dgraphic Java libray. A bidimensional rendering engine, especially suitable for faster pixel-based image processing, is P2D(Processing 2D). If one wants to program in 3D, he must choose either the P3D (Processing 3D) rendering engine,especially suited for web-oriented graphics, or OPENGL, which delegates many typical 3D operations to the graphicboard thus freeing the CPU from many computations. Moreover, if the objective is high-quality printing with vector graphics, a PDFrendering option is available.

Images

In Processing, an image can be assigned to an object of the class PImage . The function loadImage("myImage") takes a file (gif or jpg) myImage , containing the pixel coding of an image, and gives back the content of such image, which can beassigned to a variable of type PImage . The file myImage must be loaded in the data folder of the directory having the same name as the Processing sketch we are working at.

When the New command is executed, processing opens up a folder named sketch_??????? within the Processing directory, corresponding to the name assigned bye the system to the newly created file. Such folder is accessible from theProcessing menu item Sketch/Add File .
The class PImage gives access, by the fields width and height , to the width and height of the loaded image. The image content is accessed viathe pixels[] field.

Loading and visualizing an image

size(400,300); PImage b;b = loadImage("gondoliers.jpg"); println("width=" + b.width + " height=" + b.height);image(b, 0, 0, 400, 300); // position (0,0); width=400; height=300; image(b, 20, 10, 100, 80); // position (20,10); width=100; height=80;
Got questions? Get instant answers now!

Colors

Since our color receptors ( cones ), each tuned to a wavelength region, are of three kinds, color modelsare always referred to a three-dimensional space. In additive color models, each of three axes correspond to a base color,and by mixing three colored light beams one can obtain all colors within a gamut volume in the space defined by the three axes. The three base colors can be chosenarbitrarily or, more often, based on the application domain (e.g., color of three phosphors or laser beams). In printingprocesses, subtractive color models are used, where the starting point is the white surface and primary ink colors areused to subtract color from white.

Guide to color models: (External Link)

In processing color is a primitive type used to specify colors. It is realized by a 32-bit number, where thefirst byte specifies the alpha value, and the other bytes specify a triple either in the RGB or in the HSB model. Thechoice of one model or the other is made by the colorMode() function. With three bytes, a number of 256 256 256 16777216 are representable.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Media processing in processing. OpenStax CNX. Nov 10, 2010 Download for free at http://cnx.org/content/col10268/1.14
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Media processing in processing' conversation and receive update notifications?

Ask