问题
I need to export pictures of the graphs and plots I am creating with Bokeh.
Usually I do
output_file("test.html")
However, I want to copy that graph into an Excel Sheet. It does not have to be interactive anymore, though that would be brillant. How do I export the graph as a picture? Using code, not clicking on "preview/save".
回答1:
As of Bokeh 0.12.6, it is now possible to export PNG and SVG directly from
Python code.
Exporting PNGs looks like this
export_png(plot, filename="plot.png")
And exporting SVGs looks like this
plot.output_backend = "svg"
export_svgs(plot, filename="plot.svg")
There are some optional dependencies that need to be installed. You can find more information in the Exporting Plots section of the User Guide.
回答2:
Alternatively, if you are willing to work with JavaScript. And, for instance, if you want to save many canvas (each canvas element has a plot) at the same time you can use the JavaScript method canvas.toDataUrl() to convert the canvas to png as base64. When you get all the images you can do whatever you want with them. These images have 96dpi and it cannot be changed, so if you want more resolution you will have to update the sizes of all the elements of the plot before the convertion as well: fonts, axis, plot size...
If you use this approach you do not need to install selenium and phantomjs dependencies in your python environment.
Also, be aware that if you use export_png and you export the plot with a bigger size, the axis and fonts are not going to be proportionally bigger
回答3:
OK, correcting to myself, I miss your part about not using the preview/save... Currently we do not provide a direct programmatic way to export Bokeh plots to a png file. You will need the user interaction even using internal functions. We could probably add a feature like that in the feature.
Cheers.
回答4:
I asked a similar question yesterday. The linked solution may work for you. Basically you open the file in a web page, take a screen shot which you can then crop and save as an image.
Python open html file, take screenshot, crop and save as image
来源：https://stackoverflow.com/questions/24060173/with-bokeh-how-to-save-to-a-png-or-jpg-instead-of-a-html-file