how to use dot to output an image

gistfile1.txt

digraph G{
    node [shape=record]
    a[label="ResNet50|{input:|output:}|{(224, 224, 3)|(2048)}"]
    b[label="InceptionV3|{input:|output:}|{(299, 299, 3)|(2048)}"]
    #c[label="Xception|{input:|output:}|{(299, 299, 3)|(2048)}"]
    Merge[label="Merge|{input:|output:}|{(2, 2048)|(4096)}"]
    Dropout[label="Dropout|Rate:|0.5"]
    Output[label="Output|{input:|output:}|{(4096)|(365)}"]
    Image -> a -> Merge
    Image -> b -> Merge
    #Image -> c -> Merge
    Merge -> Dropout -> Output
}

save it as .dot file

dot -Tpng -o ./test.jpg graph.dot