Dash plotly 图像不在浏览器中呈现，但在 jupyter 笔记本 python 中显示

Question

我有以下代码：

fig = go.Figure()

# Constants
img_width = 600
img_height = 400
scale_factor = 0.5

# Add invisible scatter trace.
# This trace is added to help the autoresize logic work.
fig.add_trace(
    go.Scatter(
        x=[0, img_width * scale_factor],
        y=[0, img_height * scale_factor],
        mode="markers",
        marker_opacity=0
    )
)

# Configure axes
fig.update_xaxes(
    visible=False,
    range=[0, img_width * scale_factor]
)

fig.update_yaxes(
    visible=False,
    range=[0, img_height * scale_factor],
    # the scaleanchor attribute ensures that the aspect ratio stays constant
    scaleanchor="x"
)

# Add image
fig.add_layout_image(
    go.layout.Image(
        x=0,
        sizex=img_width * scale_factor,
        y=img_height * scale_factor,
        sizey=img_height * scale_factor,
        xref="x",
        yref="y",
        opacity=1.0,
        layer="below",
        sizing="stretch",
        source="logo.png")
)

# Configure other layout
fig.update_layout(
    width=img_width * scale_factor,
    height=img_height * scale_factor,
    margin={"l": 0, "r": 0, "t": 0, "b": 0},
)
fig.show()

当我在笔记本上执行此操作时，会显示图像。但是当我在浏览器上尝试时，没有显示任何内容。我附上屏幕截图以供参考。它只显示一个空块而不是图像。我附上了应用程序布局代码供参考。知道为什么吗？ 我在浏览器上显示的代码：

app.layout = html.Div(style={'backgroundColor': 'white'},
children=[

    #Title
    html.Div(html.H1(children="My Dashboard "))

    #Generate Dash table

    ,dcc.Graph(figure=fig),



                    ])
```[![Screenshot][1]][1]


  [1]: https://i.stack.imgur.com/9EJ9W.png

Answer 1

我解决了。我使用了完全不同的方法

image_filename = 'unilogo.png'
encoded_image = base64.b64encode(open(image_filename, 'rb').read())
app.layout = html.Div([
html.Img(src='data:image/png;base64,{}'.format(encoded_image.decode()))
])