human
Solve the following python programming problem given the following code:
@ convert ('convert test.png +matte -fx "Gold*.7" color_fx_math.miff') 
def test_color_fx_math(ctx) : 
    gold = RGBColor.parse ('gold') 
    @ image_filter 
    def gold_filter(self, * a) : 
        return (gold * 0.7) 
img = get_image ('test.png') 
    img [0].translucent = False 
    img = gold_filter (* gold) 
    ctx.compare (img, 'color_fx_math.miff') 

    
    

    Fix the buggy line: img = gold_filter (* gold)
assistant
#Here is Python code to fix the buggy line: img = gold_filter (* gold)
.

img = gold_filter (* img)