JMGGarcia opened a new issue #9857:
URL: https://github.com/apache/incubator-superset/issues/9857


   **Is your feature request related to a problem? Please describe.**
   Hello! I've been creating a dashboard to compare how city life was affected 
by Covid, by presenting graphs side by side with different time windows: before 
and after Covid hit. Scoped filtered have been immensely helpful in this, but I 
seem to be limited to line graphs to compare two graphs (because they allow me 
to fix the Y axis, and other graphs seem to be lacking a similar feature). 
   
   I would also like to use **heatmaps** for this purpose, but at the moment I 
can't fix the colors of the graph to certain values. To be more concrete, there 
is an option to fix value bounds, but they seem to operate on the percentage of 
the cell, and not on the actual value. This makes it difficult to compare two 
heatmaps side-by-side. 
   
   **Describe the solution you'd like**
   Give the ability to define the value bounds of the graph based on the values 
on the cells and not on the percentages. 
   
   **Describe alternatives you've considered**
   .
   
   **Additional context**
   I can understand from an implementation point of view, using the percentage 
is a more direct solution, but what I purpose here seems (at least in my 
opinion) way more useful and relevant. Even if not comparing graphics side by 
side, it can give a better perception of what changed when using different 
filters. 
   
   Take the following example, it is not really perceptible that the lower 
image contains higher values than the higher one (one could even say that the 
colors do give the wrong perception) and the legend might provide even more 
confusion. 
   
   ![image 
(8)](https://user-images.githubusercontent.com/6731738/82445109-2d12bd80-9a9c-11ea-9927-4478760956f4.png)
   ![image 
(9)](https://user-images.githubusercontent.com/6731738/82445113-2f751780-9a9c-11ea-9394-056fdbeff7be.png)


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