uniform sampler2D tex;

void main( void ) {
	gl_FragColor = texture2D(tex, gl_TexCoord[0].st);

	vec2 offset = vec2(0.01, 0.0);

	vec4 a = texture2D(tex, gl_TexCoord[0].st - offset);
	vec4 b = texture2D(tex, gl_TexCoord[0].st + offset);

	if(length(a-b) < 0.1 && length(gl_FragColor.rgb) > 0.3)
		gl_FragColor *= 1.0 + 0.01/length(a-b);

	gl_FragColor.a = 1.0;
}