Pixel value from Image

[vicer1234]

HI,
         I am trying to get the pixel value from  a .TGA file.
After reading the value it is stored in a buffer array. then the buffer array is manipulated to get the desired effect.

It is used for the 2d water ripple effect.

My problem is when I use
                      Image.GetPixel(i,j);
it returns value that is not numeric for eg: it sends value as r='L' g = '£'  b='A'

as a result i am not able to retrieve the numeric value of each pixel. So i cannot store proper value in BUFFER.

And i cannot use  the function     Image.SetPixel(i,j, sf::color( r,g,b))

since the value of (r,g,b)  cannot be properly set since its not retrieved properly from the GetPixel();

What should i do get the proper (r,g,b) value

All suggestions are welcome

[Laurent]

it returns value that is not numeric for eg: it sends value as r='L' g = '£' b='A'

They are numeric, you're just displaying them as characters instead of integers (because their type is sf::Uint8, which is a typedef for unsigned char).

[vicer1234]

hi,
     I am trying this code for the pixel value but it crashes

Code: [Select]



#define RGB32(r,g,b) ((r << 16) + (g << 8) + b)

long* buffer;

buffer[0] = RGB32(0, 154, 191);



it compiles with no error but crashes at run time at the statement buffer[0] = RGB32(0, 154, 191);


A 'long' can store int value...so why is it crashing???

[Nexus]

buffer is an unitialized pointer.

By the way, you should use functions instead of macros.

[vicer1234]

buffer is an unitialized pointer.

if I initialize the the buffer in the beginning like

long* buffer = 0;


Still it crashes!!!!!

[Nexus]

You should really learn the C++ basics before you use pointers or arrays... Null pointers may not be dereferenced.

And don't use macros when you can use functions.

[vicer1234]

You should really learn the C++ basics before you use pointers or arrays... Null pointers may not be dereferenced.

And don't use macros when you can use functions.

ok..got it