Jpeg to uint8 mat

• Step 0: Resize:

https://www.simpleimageresizer.com/resize/jpg

• Step 1: This would turn jpeg to ppm-p6.

https://onlineconvertfree.com/zh/convert-format/jpg-to-ppm/

• step2: This turns ppm-p6 to ppm-p3:

https://thomasebsmith.github.io/ppm-converter/

• step3: use ppm_load() function in this file:

https://github.com/julyfun/find-light-circle/blob/28de4d34d8a8063486688e5545778720e6fb9798/main.c