Where can I find the most eye-catching color shades?

Question

Design

Question for designers .
I have reports that are being reviewed by management.
There are pies and it is indicated how much in% of the "pie" these or those values ​​occupy.
It doesn't matter what the values ​​are.
It is important that I have 38 of them !
If there were 3 of them, then there would be no problems: I mark one, for example, in green,
the second in red, the third in yellow.
But here I have as many as 38 different colors!
I struggled for several hours to make the shades differ from each other.
I am sure that from the point of view of interface design, this is a standard task.
Two questions:

1. Advise specific solution for 38 colors
   
2. Recommend a book on "color" (this is for general development)
   

Answer 1

Special service for selecting the most different color shades:
7act.ru/colorluck.php

Answer 2

I fought for several hours so that the shades did not differ from each other.

Perhaps they still need to be different?
If so, with so many colors, it's a very difficult task. If the cake cannot be simplified in any way, then textures should be used. They can be combined with flowers. For example, normal red = value #1. Red with white dots = value #2. Red with white stripes = value #3. Etc. There are a lot of simple, but very different textures / patterns / patterns: dots, stripes, circles, squares, triangles, any geometry in general, plus they can also be combined.
This is usually done when accessibility is concerned - not everyone can distinguish colors well, so you need to duplicate the color code with auxiliary elements.

Answer 3

Replace pie chart with a different kind of chart.
As one of the options:
https://atlas.media.mit.edu/en/explore/tree_map/hs...
Or here it is, but with Germany more clearly:
atlas.media.mit.edu/en/visualize/ tree_map/hs92/exp...
Another option:
www.nytimes.com/interactive/2013/05/25/sunday-revi...

Answer 4

38 pieces of a pie is a real overload and impossibility of perception of the data!
Pieces within the range of less than 10% are called "Other" or "Next segmentation" (if there are more than 2 such segmentations).
If the pieces are almost all the same, then the PIE diagram is absolutely not indicative.
And for this, a relative comparison is used, where the largest is 100%, and the smallest is 0%. And it is displayed either as a PIE chart or as a BAR chart. Pieces less than 10% (here also) - are called "Other".
For "Others" - make a separate diagram, i.e. downward "dive" to smaller values ​​(parts) of the chart.
Those. with 38, you get about 4-5 such diagrams that will really carry information!

Answer 5

And what prevents you from finding them programmatically?
My simple script hastily scribbled (I can show you) found 38 shades. And the difference is noticeable

Answer 6

The d3.js library has a set of built-in, eye-catching color palettes specifically designed for displaying charts and graphs.
Here they are on GitHub: https://github.com/d3/d3/wiki/Ordinal-Scales#category10
1 palette of 10 colors
+ 3 palettes of 20 colors

Answer 7

38 different options will turn into porridge, not a pie. Number the pieces, make two colors through one.