Handdrawing image and saving it as an array?

Question

Question: What program / file format should I use?

I want to create an image (handdrawn pixel by pixel) and have it exported to text file formated as a pseudo-array of integers like this:

16  8

0   0   0   0   0   0   0   0   1   1   1   1   0   0   0   0
0   0   0   0   0   0   0   0   0   0   0   2   0   0   0   0
0   0   0   0   0   0   0   0   0   0   0   3   0   0   0   0
0   0   0   0   0   0   0   0   0   0   0   4   0   0   0   0
0   0   0   0   0   0   0   0   0   0   0   9   0   0   0   0
0   0   0   0   0   0   0   0   0   0   0   10  0   0   0   0
0   0   0   0   0   0   0   0   0   0   0   11  0   0   0   0
0   0   0   0   0   0   0   0   0   0   0   12  0   0   256 0

I want every number to represent unique color (not actually matter what color as long as drawing program (the simpler, the better - MS Paint would do) itself can read it and I can distinguish it from others). Ultimately I want the ability to quickly draw an image with external program and use such exported data within my code. Can someone point me to the right direction?

I tried to export image to .c with GIMP, but the results:

/* GIMP RGB C-Source image dump (Bez nazwy.c) */

static const struct {
  guint      width;
  guint      height;
  guint      bytes_per_pixel; /* 2:RGB16, 3:RGB, 4:RGBA */ 
  guint8     pixel_data[64 * 64 * 2 + 1];
} gimp_image = {
  64, 64, 2,
  "\377\377\0\0\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
  "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
  "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
  "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
  "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
  "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"...

though close to the point, are not exactly what I expect.

And here I see other possible solution: draw simply bmp image and try to translate it to an array of ints in my actual code (C#). But I would like to avoid this unless there is some simple and quick way / handy library to do this.

Or maybe some of You know any online converter that can take .bmp and return an array of ints?

Can you use something like this http://stackoverflow.com/questions/19586524/get-all-pixel-information-of-an-image-efficiently ? — KMoussa, May 17 '17 at 12:20
Nice, but I'm looking rather for something like this [link]http://www.digole.com/tools/PicturetoC_Hex_converter.php — Math Guy, May 17 '17 at 15:52

score 0 · Accepted Answer · answered Jun 22 '17 at 18:27

#include "ui_mainwindow.h"
#include <QString>

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>

using namespace std;

void generate(Ui::MainWindow* ui)
{
    if (ui->pic_label->pixmap() != 0)
    {
        int cap = 1024 * 4;
        int ct = 32;    //color tolerance
        //int number_of_colors_third = 256 / color_tolerance;//=256/32=8
        int *uncompressedcolortable = new int[256*256*256];
        for (int k=0; k<256; k++){
            for (int j=0; j<256; j++){
                for (int i=0; i< 256; i++){
                    uncompressedcolortable[k*256*256+j*256+i] = k*1000000+j*1000+i;
                }
            }
        }
        int width = ui->pic_label->pixmap()->width();
        int height = ui->pic_label->pixmap()->height();
//        int tiles = width * height;

        if ( (width > cap || height > cap) && !(ui->actionSurpass_sanity_check->isChecked())){
            ui->label->setText("File is too big to generate map. Check menu option if you want to process it anyway.");
            return;
        }

        QImage image = ui->pic_label->pixmap()->toImage();
        ui->lcdRED->setPalette(Qt::red);
        ui->lcdGREEN->setPalette(Qt::green);
        ui->lcdBLUE->setPalette(Qt::blue);
        ui->progressBar->setMaximum(height);
        QColor pixel_color;
        ofstream outfile ("C:/Users/Niewzruszony/Desktop/map.map");
        outfile << width << " " << height << std::endl;

        for (int j = 0; j < height; j++ )
        {
            outfile << std::endl;
            for (int i = 0; i < width; i++)
            {
                pixel_color = image.pixelColor(i,j);
                outfile << uncompressedcolortable[pixel_color.red()*256*256 + pixel_color.green()*256 + pixel_color.blue()];
                if(i != width-1) outfile << "\t";
                ui->lcdRED->display(QString::fromStdString(to_string( pixel_color.red())));
                ui->lcdGREEN->display(QString::fromStdString(to_string( pixel_color.green())));
                ui->lcdBLUE->display(QString::fromStdString(to_string( pixel_color.blue())));
            }
            ui->progressBar->setValue(j+1);
        }

        ui->lcdRED->setPalette(Qt::lightGray);
        ui->lcdGREEN->setPalette(Qt::lightGray);
        ui->lcdBLUE->setPalette(Qt::lightGray);
        ui->lcdRED->display(QString::fromStdString("0"));
        ui->lcdGREEN->display(QString::fromStdString("0"));
        ui->lcdBLUE->display(QString::fromStdString("0"));

        ui->label->setText("Generated RGB map.");
        return;
    }
    ui->pic_label->setText("First please choose image to process!");

}

Done it wit Qt. Just thougth I will share the code. Note I've done some quick cleanup while posting, to not to include unimportant stuff (at least not all).

Handdrawing image and saving it as an array?

1 Answers1