Displaying image (in raw format)

The first question that comes to my mind is, do you understand the format of each pixel in that raw image data?

Raw images aren't formally standardized, though most are along the lines of 24 bit pixels (8 bits per channel), but they can be 16 bits per channel or even floating point. They could even by non RGB.

The basic plan would be to create a wxImage object, initialize to an appropriate size, use the GetData member function of wxImage to get a pointer to the pixel data and copy the pixels into position with whatever color conversion is required.

If, for example, your source image is RGB 8 bits per channel, you have very little work to do other than ensuring the order of the color channels matches (some, occasionally, could be BGR, and there could be an alpha channel).

In other words, this isn't the most complicated thing to do, but you'll need to research a little on the colorspace conversion (if any), and experiment with wxImage. After that, widgets is fairly good about converting the wxImage to a wxBitmap which can be displayed as a DIB using blits.

Thanks for your replies

@Loki
My application is ok with bmp, jpg images but stuck with .raw

I am reading the data into a 2d array of unsigned char
then I am trying to use to create image
wxImage(int width, int height, unsigned char* data, bool static_data = false)

i am declaring array as:
unsigned char *pixevalues[rows][cols]

user slelcts the file through the GUI --the data is read through a fstream object opened for input

fstream rawimage;
rawimage(filename, ios::in) ///filename got through the File open dialog box

then with a nested for loop the data is read into the array
rawimage>>pixelvalues[rows][cols]

it compiles ok but the problem is that whenever the pogram is run it throws an exception--maybe because the data is not being read into the array...i am confused because apparently above code worked well when i tried it in a separate program with just cout statements. kindly check the code is there something wrong with declaration etc. any help will be appreciated
thanks

@Loki
My application is ok with bmp, jpg images but stuck with .raw

i realised that - what i mean is that you will have to create your own image handler to read the pixel information from the RAW format and create a bitmap to display.

windows can only display bitmaps, it is just that your jpg handler is already written for you :)

should it not be:

//width and height must first be obtained from somewhere
//unless they are 256 as your loop suggests?

int width, height;
width = height = 256;

unsigned char pixelval[width][height];

...

for(row=0; row<width;row++)
{
for(col=0; col<height;col++)
{
rawimage>>pixelvalue[row][col];
}
}
rawimage.close();
}

size of the image is known
thanks for the link but but last question:) what could be the reason for data not being read into the array?

include "fstream"

ifstream rawimage;
rawimage(filename, ios::in);

.....
rawimage>>pixelvalues[row][col]

thanks

I have tried that but still there is problem
thanks

thanks
this problem :)is solved