GLuint *image; //...read in image from file
glPixelStorei(GL_UNPACK_SWAP_BYTES,GL_TRUE);

//using GLubyte and scaling to GL_UNSIGNED_BYTE
GLubyte * imageScaled = new GLubyte[512*512*3];
gluScaleImage(GL_RGB, col, row, GL_UNSIGNED_INT, image, 512, 512, GL_UNSIGNED_BYTE, imageScaled);
glDrawPixels(512, 512, GL_RGB, GL_UNSIGNED_BYTE, imageScaled);

GLuint *image;//...read in image from file
glPixelStorei(GL_UNPACK_SWAP_BYTES,GL_TRUE);

//using GLuint and scaling to GL_UNSIGNED_INT
GLuint * imageScaled = new GLuint[512*512*3];
gluScaleImage(GL_RGB, col, row, GL_UNSIGNED_INT, image, 512, 512, GL_UNSIGNED_INT, imageScaled);
glDrawPixels(512, 512,GL_RGB, GL_UNSIGNED_INT, imageScaled);