RK3588 implements image operation

I have a need to convert images and combine multiple images. Can RK3588 achieve this? How to implement image manipulation?

Totally achievable. rockchip has a dedicated 2D hardware accelerator, which can be used to accelerate point/line drawing, perform image scaling, rotation, bitBlt, alpha blending, etc.
Common 2D graphics operations.

You can obtain rga document information in the docs document in the SDK