Legend color does not match graph color

[plotmaster422]

For a histogram of given random variable X, I I graph the kernal density estimation along with the correct histogram of the given sample, where the histogram has the transparency of 0.5.

I want my legend to reflect my color choice. But instead, it shows me the color of my KDE.

How do you match the 0.5 transparency, and the given color, to the legend?

[AIMPED]

Hi @plotmaster422,

could you provide the code for this chart and let us know, which colors do you want to be matched?

I assume you are plotting two traces, right?

[plotmaster422]

Yes, using the generic histogram function from go.Figure(), then a scatterplot on on top of that - here is my code

ff = go.Figure()
ff.add_trace(go.Histogram({"histfunc": "count", "x": continuous, "histnorm": "probability density",
                           "opacity": 0.7, "marker": {"color": "rgba(4, 217, 255, 255)"}}, name=continuous.name.title() + "  "))
ff.add_trace(go.Scatter({"x": density, "y": pdf, "mode": "lines", "marker": {"color": "rgba(4, 217, 255, 255)"},
                         "showlegend": False}))

Ideally, color should be rgba(4, 217, 255, 0.7), but it shows up with an alpha of one.

[AIMPED]

Could you please provide a MRE?

How to write a Minimal Reproducible Example (MRE)

Adding a minimal reproducible example to your questions will help attract community members to answer your question. The goal of writing a MRE is to allow other members of the community to run the code on their computers and “reproduce” the error, so that they can best help you. Please make sure that your MRE includes data and that the code is correctly pre-formatted. To preformat, copy and paste the code in your post and then click on </> (Preformatted text), as shown on the image: [pre-for…

[empet]

@plotmaster422

1. In your scatter trace you should set line_color, not marker_color, because you have mode="lines"!!!

2. I suspect that you are perceiving a difference in color, because you have a black background for the plot, and a white one for the legend.
   This is an example that also has a black legend background:

import numpy as np
import plotly.graph_objects as go
from scipy.stats import norm

x = np.random.normal(1, 1.2, size=300)
X=   np.linspace(1-3*1.2, 1+3*1.2, 100)
mypdf=norm.pdf(X, loc=1, scale=1.2)

fig =go.Figure(go.Histogram(x=x, histfunc="count", histnorm= "probability density",
                           opacity= 0.7, marker_color= "rgba(4, 217, 255, 255)", 
                 name="hist"))
fig.add_scatter(x=X, y=mypdf, mode="lines", line_color="rgba(4, 217, 255, 255)")
fig.update_layout(width=700, height=400, plot_bgcolor="black", yaxis_showgrid=False, yaxis_zeroline=False,  bargap=0.01, legend_bgcolor="black")
fig.show()

[plotmaster422]

Hello empet, you were right. it was an optical illusion from dark mode. colors were, in truth, both the same. legend stays unchanged.

Thank you!