How to retrieve all individual images from a sheet

[plumedours]

Hi !

(please excuse my English, I use Google Translate)

Could you help me understand how to cut sprites from a spritesheet? And how to remove the colored background?

For example, for this spritesheet: https://www.spriters-resource.com/snes/s...et/203586/

I would like to recover all the individual images and without the purple background.
Is there any software, specialized site or artificial intelligence that could automatically detect?

Thanks for your help !