UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Learn C Language from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

C Language > Learn C Language > How do I write a C++ program to read the JPG format...
✕

Search in

How do I write a C++ program to read the JPG format picture, square the dots per pixel and output the image?

Asked by Last Modified  

2 Answers

Learn C Language

Follow 1
Answer

Please enter your answer

You probably don’t actually want to do what you are asking how to do. As Jim Clack pointed out in his answer, a JPEG file doesn’t store a raster image, it stores a compressed image as a set of transforms. When you convert this image into a bitmap in memory, that’s a process called rendering. Say...
read more
You probably don’t actually want to do what you are asking how to do. As Jim Clack pointed out in his answer, a JPEG file doesn’t store a raster image, it stores a compressed image as a set of transforms. When you convert this image into a bitmap in memory, that’s a process called rendering. Say I had a JPEG image, and the image was, in theory, “naturally” 400x400 pixels in size. I could render it into a bitmap in memory as a 400x400 image, and that would get me a 400x400 raster image, as a bitmap. And then I take that image, and do as you suggest, to magnify it into an 800x800 image, turning each pixel into a square composed of 4 pixels, at two pixels on a side. You’re going to get a pretty crappy image, and unless your intent is to make the image look as if it were being displayed on an old-time 8-bit computer, like an Atari 2600, or a Commodore 64, or an old game console, such as the original Nintendo/Famicon system, or an old Mattel Intellivision, etc. — you’re going to end up with a pretty terrible image. If, instead, you created an 800x800 canvas (an empty bitmap), and rendered the JPEG into it at that resolution directly — then the math is going to work out in such a way as to make the image look a whole heck of a lot better. The reason for this is that the 2x2 pixel regions won’t all be the same color; instead, what gets rendered into an individual pixel is going to depend on the adjacent information — in other words, it’s going to decompress into different pixel colors, for each of the pixels in the 2x2 region. read less
Comments
Dislike Bookmark

Tutor

The logic of this program includes the size of an image. Assuming the size of an image as 250x250. function img_read( ) { image(i,j)=0; for(i=0;i<=249;i++) { for(j=0;j<=249;j++) { image(i,j) = image(i,j)+25; } } printf("The read image with enhanced contrast is:"ima...
Comments
Dislike Bookmark

Related Questions

What are the average charges for online teaching per hour basis for computer languages like C?
Rs:600/Hr
Sumit Kumar
Why is C programming language called C?
The C programming language is named "C" because it was developed as a successor to an earlier programming language called "B." B was created by Ken Thompson at Bell Labs in the early 1970s, primarily for...
Ashwini
0 0
6
What is the concatenation operator?
The concatenation operator (##) is used to concatenate (combine) two separate strings into one single string. The concatenation operator is often used in C macros.
R.s.praveen
how much time does it take to learn c language from basic to advance range
3 month and also depend in your skill to learning power...
Nithin
How can you avoid including a header more than once?
Most common ways, use: #pragma once on top of the each header file (though non standard but most compilers support it) or do the following, if you want to protect abc.h from multiple inclusions then...
Deepak
0 0
7

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

C-Program Swapping Contents Of Variables Using Function [Call By Reference Method]
//Header Files #include#include // User defined functions swap with 2 pointer variables passed as an argument list void swap(int*i,int*j){ // Local variable temp int temp; // swapping contents using...

Salim Ahmed Ansari

0 0
0
Functions In C Programming
A C-language program is nothing but collection of Function, these are the building blocks of a ‘C’ program. Generally, a function mans a task. “Function is a...

M Chandra Rao

0 0
0
Java and C trainer
Always think any conspect with real-time example like Object -- object must have states and behaviour then only we will call that thing is Object like fan is Object (rotating,color)

Jadav Avinash

0 0
0
Structures in C
A structure is a collection of one or more data members possibly of different data types, grouped together under a single name for convenient handling. Defining a Structure: In general terms,...

Venkateswararao S.

0 0
0
Static and dynamic libraries
A library is a package of code that is meant to be reused by many programs. A static library (also known as an archive) consists of routines that are compiled and linked directly into your program. When...

Vijay Kumar

1 0
0

Recommended Articles

Brilliant Academy, a reputed B. Tech Tuition...

Brilliant Academy is one of the reputed institutes for B.Tech tuition classes. This institute is specialised in delivering quality tuition classes for B.E, Engineering - all streams and Engineering diploma courses. Incorporated in 2012, Brillant Academy is a brainchild of Mr Jagadeesh. The main motto of the academy is to...

Read full article >

Lasya Infotech: An educational Training...

Lasya Infotech is a Hyderabad based IT training institute founded in 2016 by O Venkat. Believing in his innovation, passion and persistence and with a diverse blend of experience, he started his brainchild to deliver exemplary professional courses to aspiring candidates by honing their skills. Ever since the institute envisions...

Read full article >

Make a Career in Mobile Application Programming

Almost all of us, inside the pocket, bag or on the table have a mobile phone, out of which 90% of us have a smartphone. The technology is advancing rapidly. When it comes to mobile phones, people today want much more than just making phone calls and playing games on the go. People now want instant access to all their business...

Read full article >

What is Applications Engineering all about?

Applications engineering is a hot trend in the current IT market.  An applications engineer is responsible for designing and application of technology products relating to various aspects of computing. To accomplish this, he/she has to work collaboratively with the company’s manufacturing, marketing, sales, and customer...

Read full article >

Find C Language Classes near you
C Language Classes in Bangalore
C Language Classes in Delhi
C Language Classes in Hyderabad
C Language Classes in Chennai
C Language Classes in Pune
C Language Classes in Mumbai
C Language Classes in Kolkata
C Language Classes in Noida
C Language Classes in Ahmedabad
C Language Classes in Ghaziabad

Looking for C Language Classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for C Language Classes?

The best tutors for C Language Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn C Language with the Best Tutors

The best Tutors for C Language Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2025 All Rights Reserved