C :: Read A 24 Bit Image Using 2D Array

Oct 29, 2013

I am trying to read a 24 bit image but I'm getting errors when I'm tryting to read the pixels.

-The reading part looks bad because I'm reading both headers field by field. But I'm sure that it is reading both headers correctly.

-Right now my biggest concern is to get it to read successfully an entire bmp image

I'm using this calculation to get my padding bytes:

padding bytes = [4-(3*width)mod 4]mod 4

When I use a 2x2.bmp file to test it, I get an error that the [1][1] pixel was not read. When I use a bigger image it gives me the same error after about 100 rows and then every pixel is an error from that point on. This is what I got so far:

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
const size_t cSizeofPixel = 3; //size of struct tPixel
typedef struct{
unsigned char blue;
unsigned char green;
unsigned char red;

[Code]...

I read this post Reading 24 bit BMP file into a 2d array.

I still don't know if my error is when I allocate memory to my 2d array, or if I'm doing the padding bytes wrong or if it is something else.

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C++ :: Program To Read Image (Later Represent By Array 3D)

May 1, 2013

I will make a program to read the image in C++. And later, the image will represent by array 3D, which (x,y) represent the spatial coordinate of (height*weight) image (pixel) and z represent the intesity of those image (0-255).

In matlab, the code for do that is --> imread('image.jpg')

How can I do that in C++?

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Apr 8, 2014

I am trying to read the information from a .bmp file into my program while dynamically allocating memory for all of it. So I defined the structures for the headers and for a pixel, and then I have to read each pixel into a multi-dimensional array of pixels. I am completely new to structures, and definitely new to pointers combined with structures. I will have to use a filter with the information later, but right now I just want to read everything in correctly. The array of pixels will be two-dimensional -- the width by the height of the image, I guess.

Here's my code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
FILE *inFile, *outFile;
typedef struct

[Code] ....

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Nov 20, 2014

I have an *.lct file. I like to read *.lct file and save an bmp image.

I can not read this file using usual file read.

Code:

void CLCTtoBMPDlg::OnBnClickedReadlctfile() {
CFileException CFileEx;
CStdioFile ReadFile;
CString OpenlctfilePath;
TCHAR szFilters[]= _T("LCT Files (*.lct)");
CFileDialog fileDlg(TRUE, _T("bmp"), _T("*.lct"), OFN_FILEMUSTEXIST | OFN_HIDEREADONLY, szFilters);

[Code]...

Find the attachment. change the file extension *.lct instead of *.txt. I like to read ASCII Data into Hex, Example : Data "A" as "41" (Refer the jpeg image). How is possible?

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Apr 4, 2013

I have an assignment where I need to take an assigned image, rotate it 90 degrees to the right, flip it upside down, and turn it to grayscale; each with different outputs.

I was thinking if I can read in the image into a 2d array //array[height][width] or even just an array with the values of each pixel (r, g, b), I can just modify the array and spit it out when done.

if i can just get it into the array, I think I'll be fine. We've done similar assignments with modifying arrays for grayscale images and the other two I can probably figure out. But how am I going to read in each pixel into an array with three different values in each slot? This is my code so far:

Code:
#include<stdio.h>

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C++ :: Use 3D Array To Create Image

Sep 16, 2014

My assignment is use a 3D array to create an image. Use an array of the form arr[300][200][3]. For this homework, you need to use an array of the form arr[3][400][500]. It will have 400 rows and 500 columns. You need to first initialize the array as described in class and after that write the array to a ppm image file. When viewed using Gimp, it should display USM. The letters would be 200 pixels high and 100 pixels wide each. Use at least 15 pixels for the width of the stroke. Use different colors for each letter and a different color for the background.This is what I have so far.

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

void initialize(unsigned char a[][200][3], int nrows, int ncols, int nc);
void printAll(unsigned char a[][200][3], int nrows, int ncols, int nc);

[code]....

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Jul 3, 2014

Im trying to compare the image of a button to another image in Visual Studio like so...

//variables
Image active = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\active.png");
Image stunned = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\stunned.png");

[Code]...

btnStatusPlr1.Image SHOULD come back as True.Then I realized it might not be the same as setting the buttons image in the properties (Which is what i did to get the original image (the one being compared to))

I do have a feeling ive done something wrong here (Yes im a noob /> )

Variable active, is the same image as the buttons default (Well should be)

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Nov 29, 2014

I'm trying to read a PPM image into an array. The header will have already been read in and I'm trying to put in a 2-d array to make manipulations easier. This is the code I have so far with LOTS of errors and warnings and I honestly don't know what almost any of them mean.

Code:

int imageArray( FILE *input, struct pixel *theArray ){
int i, j;
int col, row;
int *imageArray = (int**)malloc(row * sizeof(int*));
for(i=0; i<row; i++){

[Code]...

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C++ :: Transform Integer Array To BMP Image

Jun 8, 2013

I have a problem concerning transforming int array into bmp image. I wanted to add a post in this topic: [URL] .... , but unfortunately it is closed. Actually I have a question concerning the code written by Duoas. I have a function which takes values from the file and I want to convert it into bmp with the use of Duoas code. I do it like that(it's Duoas code + my load and main function) Is it something wrong with how I do it or it's rather sth wrong with the file.

It compiles without errors but when I run it: core dumped.

According to gdb debugger problem is here: double hue = (intarray[ row - 1 ][ col ] - min_value) * granularity; programs stops, segmentation fault ...

#ifndef INTARRAY2BMP_HPP
#define INTARRAY2BMP_HPP
#include <fstream>
#include <iostream>
#include <string>

[Code] ....

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Feb 17, 2015

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How can I get an array of RGB from an image? Can I do it with streams?

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I am trying to retrieve an image from its URL as an array where each box represents the pixel value of the image.

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C/C++ :: Convert 256 Color BMP Image To TXT File Of Array Of 0 - 255

Feb 5, 2015

I am working on a program which turns a 256 color bmp image to a txt file of a array of 0-255. I wrote this:

#include<iostream>
#include<fstream>
// if 1 , see bmp file header info
#if 1
#define SEE_INFO
#endif
using namespace std;

[Code] ....

Something weird happened. When I use it on simple.bmp (Attachment), it works fine. But when I use it on flower.bmp , it just give me zeros.

Attached File(s)

 simple.bmp (3.39K)
 simple.txt (8.47K)
 flower.bmp (76.05K)
 flower.txt (150.49K)

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Visual C++ :: How To Convert PNG Image Into Byte Array

Mar 12, 2013

I m loading a png image by using the ATLImage library.

CImage Image;
Image.Load (L"D:ImagesPNG_ImagesImage7.png");

how to retrieve the byte array value of this png image. I tried retrieving it as

byte *png = reinterpret_cast<BYTE *>(Image.GetBits());

but when i access the data , der is a loss of data while converting it in the above manner.

I found a snippet in net for decoding the raw data . but der is a line is the code which is unknown to me. The code is as follows :

CImage atlImage;
HMODULE hMod = GetModuleHandle(NULL);
atlImage.Load(bstr);
void* pPixel = atlImage.GetBits();
intpitch = atlImage.GetPitch();
intdepth = atlImage.GetBPP();

[Code] ....

How do I get the byte * value form the png image loaded?

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Feb 8, 2013

I like to Draw an Image Using two dimensional byte array[512][256].

I used SetPixelV method to plot the image.

But Its very slow & hidden some buttons(Controls) at run time in the same dialog.

For reference i send some code,

Code:
for(row = 0; row <512; row ++)
{
for(col = 0; col < 256; col++)
{
Data[row][col] = y;
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Jan 6, 2015

I need to save RGB values of each pixel in a 3D array A[width][height][3]. I found a code online that transfers the bytes into an array but I cant understand how bytes are saved them so i could transfer them into an array. The truth is I dont know much about working with images at all so i have a problem working on them. How to transfer the RGB data from an .jpeg image into a 3D array? This is my code so far:

#include <iostream>
#include <jerror.h>
#include <jpeglib.h>
using namespace std;
int main(){
FILE *pic = fopen( "image.jpeg", "rb+" );

[Code] .....

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Mar 11, 2014

My requirement is,

Read *.bmp image and displaying bitmap image with scrollbar in a MFC dialog application.

I was done using this

I was read the *.bmp image as a pixel data and stored by 2D Array,

Now i want to Display this 2D array as bitmap image with scrollbar separately in the same dialog. How can i display bitmap with scrollbar using 2D array?

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Aug 27, 2013

I am writing a class which loads a bitmap image into a one dimension char* array.

This class has methods to allow for resampling and cropping the image before saving the bitmap image. It works perfectly for all images in which the width is divisible by 4. However when the width is not divisible by 4 the resulting bitmap is all mixed up.

I have spent much of the day googling this problem but to no avail. I know it is a problem with making sure the scanlines are DWORD aligned, and I believe I have done that correctly. I suspect that the problem is that I need to take the padding into account during the crop for loops but am lost to how to do this.

BTW: Coding on Linux using GCC

The following code is a cut down version from my bitmap class. I have removed methods which are not needed to make reading a little easier.

#include "BMP.h"
// FIXME (nikki#1#): Portrait bug on images of specific sizes
// TODO (nikki#1#): Memory leak checks
// THIS METHOD WRITES A BITMAP FILE FROM THE CHAR ARRAY .
bool BMP::saveBMP(string fileName, string *err) {
FILE *filePtr;

[Code]...

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Jul 30, 2013

im trying to read in 1 array and get 2 as outputs from 3 different functions.my read array is easy enough were im getting confused is how to read that array, separate it and take out only the parts i want and place them into a 2nd, then again a 3rd array.i have the following so far:

Code:

#include<stdlib.h>#include<stdio.h>
#include<unistd.h>
#define SIZE 10
}

[code]....

this compiles without a complaint, but when i go to run it no longer responds after taking the 10th element (well 9th if counting from 0).I think i have the if correct for the even odd section, but when i try to populate B or C array with the output of that if statement from A is were i think things are dying...

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Code:

void word_reversal(void) {
char array[100];
int index=0;
printf("Enter the number of characters less than 100
");
do {
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Nov 15, 2014

I'm finishing up my first semester as a Computer Science major, but I'm struggling with programming.

I need to read a file into a 2D array.

Here is what the file contains (90 characters):
S
R
R
S
R
R
R
R
S
....

Here is my current code:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

[Code]....

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Jul 4, 2013

I need to do a program that reads a file, that contains something like this:

8 2 3 4 2
5 6 1 3 4
3 1 4 6 7
7 2 4 1 3
3 2 1 6 8

and put in a array[][] in the program..I did this:

int main(){
using namespace std;
int size=0;
char line[1300];
FILE *file;
char path[50];
int l=0,c=0;

[code].....

But when i print A[3][3], it does not contain the correct value, but I strange value, like -36893488147419103000 .My idea was to pass line by line of the file, including the values that were not " ", to get only the numbers.

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Apr 11, 2014

I can't get the values correctly parsed.

Code:
float **get(int sizeX, int sizeY) /* Allocate the array */ {
float** ary = new float*[sizeX];
for(int i = 0; i < sizeX; ++i)
ary[i] = new float[sizeY];
return ary;

[Code] ....

test.txt (without the comments).

Code:
2 3 // columns and rows of 2D array
0 0
1 1
2 2

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Jan 30, 2013

here is my code, I'm trying to read a .txt file into a 2D array... what's wrong with my code?

Code:

#include <stdio.h>
#define INPUT_FILE_GET_NAMES "names.txt"
#define INPUT_FILE_GET_SALES "sales.txt"
#define MAX_ROWS_NAMES 25
#define MAX_COLS_NAMES 20
#define MAX_ROWS_SALES 25
#define MAX_COLS_SALES 6
//Function Declarations
char getNames(char namesArray[][MAX_COLS_NAMES], char filename[]);

[Code]...

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I need to be able to take a bitmap e.g. "untitled.bmp" (bit depth: 24) and loop through every pixel from top left to bottom right and find the rgb (or hex) value for each pixel e.g. (255,255,255) for white and store this rgb (or hex) value in a two-dimensional array depending on its [column]and[row].

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so im trying to read in the name of a vendor into an array of structures. and write the name into a file.

#include <iostream>
#include <cstring>
#include <cctype>
#include <fstream>
using namespace std;
struct booth

[code]....

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