Texture appearing black

//Texture.h

#pragma once
#include <SDL/SDL_image.h>
#include <GL/glut.h>
#include <string>
#pragma comment(lib, "SDL_image.lib")

class Texture {
	public:
		unsigned int Width, Height, Image;
		Texture(std::string Filename);
};

//Texture.cpp
#include "Texture.h"

Texture::Texture(std::string Filename) {
	Width = Height = Image = 0;
	SDL_Surface* Surface;
	SDL_Surface* Blank;
	Surface = IMG_Load(Filename.c_str());
	if(!Surface)
		throw std::runtime_error("Unable to load \"" + Filename + "\": " + IMG_GetError());

	Blank = SDL_CreateRGBSurface(SDL_SWSURFACE, Surface->w, Surface->h, 32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
    0x000000FF,
    0x0000FF00,
    0x00FF0000,
    0xFF000000
#else
    0xFF000000,
    0x00FF0000,
    0x0000FF00,
    0x000000FF
#endif
	);

	SDL_Rect Area;
	Area.x = Area.y = 0;
	Area.w = Surface->w;
	Area.h = Surface->h;
	SDL_BlitSurface(Surface, &Area, Blank, &Area);

	unsigned int numColours = Blank->format->BytesPerPixel;
	GLenum Format;
	if(numColours == 4) {
		if(Blank->format->Rmask == 0x000000FF)
			Format = GL_RGBA;
		else
			Format = GL_BGRA_EXT;
	} else if(numColours == 3) {
		if(Blank->format->Rmask == 0x000000FF)
			Format = GL_RGB;
		else
			Format = GL_BGR_EXT;
	} else
		throw std::runtime_error("Image isn't truecolour");

	glGenTextures(1, &Image);
	glBindTexture(GL_TEXTURE_2D, Image);
	glTexImage2D(GL_TEXTURE_2D, 0, numColours, Blank->w, Blank->h, 0, Format, GL_UNSIGNED_BYTE, Blank->pixels);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_DECAL);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_DECAL);

	Width = Blank->w;
	Height = Blank->h;
	SDL_FreeSurface(Surface);
	SDL_FreeSurface(Blank);
}

	Texture Image("C:/Users/James/Desktop/Obj/test.bmp");
//...
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D, Image.Image);
		glBegin(GL_QUADS);
		glTexCoord2f(0.0f, 0.0f); glVertex2f(544.0f, 0.0f);
		glTexCoord2f(0.0f, 1.0f); glVertex2f(544.0f, (float)Image.Height);
		glTexCoord2f(1.0f, 1.0f); glVertex2f(544.0f + (float)Image.Width, (float)Image.Height);
		glTexCoord2f(1.0f, 0.0f); glVertex2f(544.0f + (float)Image.Width, 0.0f);
		glEnd();