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(Instructions for writing an image explorer sketch were provided in Pr0120-Image Explorer .)

Program output

Image 1 shows the raw image being displayed in an image explorer window. Note the red, green, and blue color component values and the coordinates of the pixel to which those colors belong.

Image 1. the raw image displayed in an image explorer.

The raw image displayed in an image explorer.
Image 1. The raw image displayed in an image explorer.

Image 2 shows the modified image in an image explorer window. Once again, note the red, green, and blue colorcomponent values and the coordinates of the pixel to which those colors belong.

Image 2. the modified image displayed in an image explorer.

The modified image displayed in an image explorer.
Image 2. The modified image displayed in an image explorer.

The algorithm

The algorithm required to transform the image from Image 1 to Image 2 is:

  • Set the blue color value for every pixel to zero.
  • Invert the red and green color values for every pixel.

A color value is inverted by subtracting the color value from 255.

Obvious that the blue color value is reduced to zero

By exploring the pixel colors at several different locations, it should be obvious to the student that the blue pixel value has been set to zero forevery pixel in the modified image.

Color inversion is not quite so obvious

Deducing that the red and green colors in the output pixels are the inverse of the red and green colors in the input image isn't as straightforward.However, color inversion is one of the most common forms of image color manipulation, so a little research on the web should suffice to figure it out. I have also publishedseveral online tutorials that involve color inversion.

The implementation of the algorithm will be explained below.

Discussion and sample code

Will explain in fragments

This sketch consists of two classes, which are provided in Listing 4 and Listing 5 .

I will break the sketch down and explain it in fragments.

The driver class named Pr0130a

The driver class named Pr0130a , which is shown in its entirety in Listing 4 , is almost exactly like the class that I explained in Pr0120-Image Explorer . Therefore, I won't repeat that explanation in this module.

The runner class named Pr0130aRunner

The runner class named Pr0130aRunner is shown in Listing 5 . This class is only slightly different from the class that I explained in Pr0120-Image Explorer . Therefore, I will explain only those portions of the class that are different inthis module.

The first difference

The first difference begins within the for loop shown in Listing 1 . Recall that in the original version in Pr0120-Image Explorer , the code in the for loop copied pixel colors from the input image to the output image taking the different widths of the images intoaccount.

This version is essentially the same except that in this version, the code inverts the red and green color values and sets the blue color value to zerobefore inserting the pixel color into the output image.

Listing 1. copy pixel colors from the input image to the display image.

//Copy pixel colors from the input image to the // display image.for(int cnt = 0;cnt<img.pixels.length;cnt++){ //Get and save RGB color values for current pixel.reD = red(img.pixels[cnt]);greeN = green(img.pixels[cnt]);bluE = blue(img.pixels[cnt]);//color c = color(reD, greeN, bluE);//raw color c = color(255-reD, 255-greeN, 0);//modified
Listing 1. Copy pixel colors from the input image to the display image.

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
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Source:  OpenStax, The processing programming environment. OpenStax CNX. Feb 26, 2013 Download for free at http://cnx.org/content/col11492/1.5
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