uniform sampler2D samp0;

void main()
{
	vec4 color=texture2D(samp0,gl_TexCoord[0].st);

	color.x=color.x>1.0?color.x-1.0:0.0;
	color.y=color.y>1.0?color.y-1.0:0.0;
	color.z=color.z>1.0?color.z-1.0:0.0;
	
	gl_FragColor=color;
}