Currently, a time stamp appears in each image on the website, but it's not present in the png file metadata. A machine-readable creation date would be a good addition. It is also possible to record the software used to make the image. This information already appears in the csv files produced by the code, but could be added to the image metadata too.
The webpage also includes links to the documentation for the individual image format writers, which further reference the relevant standards for each image type (pdf, svg, and png).
Currently, a time stamp appears in each image on the website, but it's not present in the png file metadata. A machine-readable creation date would be a good addition. It is also possible to record the software used to make the image. This information already appears in the csv files produced by the code, but could be added to the image metadata too.
This can now be done in matpotlib using the metadata keyword argument in savefig. See https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.savefig.html
The webpage also includes links to the documentation for the individual image format writers, which further reference the relevant standards for each image type (pdf, svg, and png).