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Visualizing the depth buffer

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I'm attempting to visualize the depth buffer for debugging purposes. It's mostly working, but the resulting image appears to be zoomed in. Why is it not the same size as the color buffer?
void get_gl_size(int &width, int &height)
	int iv[4];
	glGetIntegerv(GL_VIEWPORT, iv);
	width = iv[2];
	height = iv[3];

void visualize_depth_buffer()
	int width, height;

	get_gl_size(width, height);

	float *data = new float[width * height];

	glReadPixels(0, 0, width, height, GL_DEPTH_COMPONENT, GL_FLOAT, data);
	glDrawPixels(width, height, GL_LUMINANCE, GL_FLOAT, data);

	delete [] data;

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