How to set a Heatmap like a background that is not affected by a dropdown menu?

Hello,
I want to plot trace1 on trace0 that is a Heatmap of a picture. I have a dropdown button to select different trace1 data. When I run this code, the 2 traces are perfect, but when I use the dropdown button, the trace0 is affected… It’s weird that we can see something on the left…

Thank you for you help !


os.chdir(FolderPath)
    init_file = glob.glob('*INIT.json')
    init_noz_check_image = glob.glob('*INIT.png')

    # Init NozCheck
    with open(FolderPath + "/" + init_file[0], 'r') as json_file:
        init_dict = json.load(json_file)
    nozzles_xy = np.array(init_dict["Nozzles XY-Coordinates"])

    # Detected Nozzles
    detected_noz_tab = np.zeros((NbreMeasure, 1280, 2))
    for i in range(NbreMeasure):
        with open(FolderPath + "/" + files[FirstToSee + i], 'r') as json_file:
            recreated_dict = json.load(json_file)
        boolean_vector = np.array(recreated_dict["Nozzle Vector"], dtype=bool)
        detected_noz_test = nozzles_xy[boolean_vector, :]
        # Array that contains Detected Nozzles of All selected JSON
        detected_noz_tab[i, 0:len(detected_noz_test), :] = detected_noz_test

    # Image
    img = cv2.imread(FolderPath + "/" + init_noz_check_image[0], cv2.IMREAD_GRAYSCALE)

    # Create the detected Nozzles trace
    trace1 = go.Scatter(x=detected_noz_tab[0, :, 0], y=detected_noz_tab[0, :, 1], mode='markers', name='trace1',
                        marker=dict(size=7, color='red'))

    # Create img trace for image background
    trace0 = go.Heatmap(z=img, showscale=False, colorscale='gray', name='trace0')

    data = [trace0, trace1]
    options = []

    for i in range(NbreMeasure):
        options.append(dict(label=f'Measure {i}',
                            method='update',
                            args=[{'x': [detected_noz_tab[i, :, 0]]},
                                  {'y': [detected_noz_tab[i, :, 1]]},
                                  ]))
    layout = dict(title='aaa',
                  xaxis=dict(title="aaaa"),
                  yaxis=dict(title="bbb"),
                  hovermode='closest',
                  updatemenus=[dict(
                      type='dropdown',
                      buttons=options,
                      direction='down',
                      showactive=True,
                      x=0.1,
                      xanchor='left',
                      y=1.1,
                      yanchor='top'
                  )])
    fig = dict(data=data, layout=layout)
    plot_url = plotly.offline.plot(fig, filename='scatter.html')