colorbar | Dynamically updatable color bars for use with d3.js

Of all the answers I see on stackoverflow, such as 1, 2 and 3 are color-coded.

In my case, I wouldn´t like it to be colored, especially since my dataset is largely imbalanced, minority classes are always shown in light color. I would instead, prefer it display the number of actual/predicted in each cell.

Currently, I use:

I want to make a pandas.DataFrame.plot with colorbar. For reproducibility, here I use the code in this post on stack overflow.

I am trying to create a visualization of square matrix with seaborn heatmap, where all elements range between 0 and 1. However, I want to only show those greater than some threshold (ex. 0.5) and set other values to 0. Moreover, I want to set the range of colorbar to be shown between 0.5 and 1, but I do not want to adjust the full colormap to range between 0.5 and 1, but keep the original colormap range.

For example, I attach two examples that I tried:

1st example

Imagine you have a segmentation map, where each object is identified by a unique index, e.g. looking similar to this:

For each object, I would like to save which pixels it covers, but I could only come up with the standard for loop so far. Unfortunately, for larger images with thousands of individual objects, this turns out to be very slow--for my real data at least. Can I somehow speed things up?

How do you size the axes of a marginal plot to match the size of a non-square central plot using matplotlib?

In the image, you'll see that the top marginal plot is too wide, even though it shares the x-axis labels.

Context: I'm trying to create a joint plot like in Seaborn, but with a non-square heatmap at center and bar graphs as the marginal plots. JointGrids isn't designed to work with heatmaps (which is okay, on to matplotlib!). Merging a matplotlib heatmap with subplot barplots gets me close, but I find one bargraph's axis is larger than the central heatmap even when I share axes.

Minimum working example:

I'm trying to plot some data, and I don't like the organization of the items. For example, I would like to have a bigger image and a smaller colorbar. When I modify the size of the figure still not proportional. And I also would like to tag each borehole to the legend, so I can identify it.

This is the image I have now:

and this is the code:

I'm using xarray's facetgrid to plot data from a dataArray. I want to plot the 12 months of data in grid form and insert the colorbar on the side. xarray already does all that, but I'm not sure how I can increase the font size of the colorbar label and the colorbar ticklabels. Here's an example to be reproduced:

I am trying to plot two imshow and one plot above each other sharing their x-axis. The figure layout is set up using gridspec. Here is a MWE: