Hi With 1024*1024 chunks I could display image as huge as possible. Thanks. 8-bit image display is not providing any problem and is well. In case of 16-bit image, black stripes are appearing at regular interval. I am doing texture mapping in the following manner, void GetImageData_8(void) { unsigned char rgb unsigned char *ptr; int i,j,k,ind; img_data_8=new unsigned char[1024*1024*4]; ptr=img_data_8; ind=0; for(i=0;i<1024T;i++){ for(j=0;j<1024;j++){ fin.read(&rgb,sizeof(unsigned char)); ptr[ind++]=rgb; ptr[ind++]=rgb; ptr[ind++]=rgb; ptr[ind++]=255; } } } void GetImageData_16(void) { unsigned short rgb; unsigned short *ptr; int i,j,k,ind; img_data_16=new unsigned short[1024*1024*4]; ptr=img_data_16; ind=0; for(i=0;i<1024;i++){ for(j=0;j<1024;j++){ fin[k].read((unsigned char*)&rgb,sizeof(unsigned short)); ptr[ind++]=rgb; ptr[ind++]=rgb; ptr[ind++]=rgb; ptr[ind++]=255; } } } void SetTexture_8(void) { glClearColor(0.25,0.25,0.25,0.0); glEnable(GL_DEPTH_TEST); glShadeModel(GL_FLAT); glPixelStorei(GL_UNPACK_ALIGNMENT,1); glGenTextures(1,&texture_name); glBindTexture(GL_TEXTURE_2D,texture_name); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,DEFAULT_WIDTH,DEFAULT_HEIGHT,0,GL_RGBA,GL_UNSIGNED_BYTE,img_data_8); delete [] img_data_8; } void SetTexture_16(void) { glClearColor(0.25,0.25,0.25,0.0); glEnable(GL_DEPTH_TEST); glShadeModel(GL_FLAT); glPixelStorei(GL_UNPACK_ALIGNMENT,1); glGenTextures(1,&texture_name); glBindTexture(GL_TEXTURE_2D,texture_name); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,DEFAULT_WIDTH,DEFAULT_HEIGHT,0,GL_RGBA,GL_UNSIGNED_SHORT,img_data_16); delete [] img_data_16; } void Display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_TEXTURE_2D); glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_REPLACE); glBindTexture(GL_TEXTURE_2D,texture_name); glBegin(GL_QUADS); glTexCoord2f(0.0,0.0);glVertex3f(0,0,0); glTexCoord2f(1.0,0.0);glVertex3f(wind_x,0,0); glTexCoord2f(1.0,1.0);glVertex3f(wind_x,wind_y,0); glTexCoord2f(0.0,1.0);glVertex3f(0,wind_y,0); glEnd(); glFlush(); glutSwapBuffers(); glDisable(GL_TEXTURE_2D); } void Reshape(int x,int y) { glViewport(0,0,x,y); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0,x,y,0,-1,1); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } Is there any mistake in my texture mapping? Is there anything beyond to specify other than the datatype GL_UNSIGNED_SHORT for 16-bit image???

No, there's nothing else to specify. It must be the code that generates the data for the texture.

No

It shows only the white scree....
I m doubting on rgba specification...but
i m not sure..