Anyone?

From studying generally about image formats online I'm now guessing that "Channel" is the R, G or B channel.
If so, are the channel numbers 0,1,2 or 1,2,3 or something else? Are they in R then G then B order?
From your earlier comments, perhaps the order is obvious to experienced programmers in this ...

Here is an examplke of what I'm struggling with.
From the code examples I can see that:
fb = esp_camera_fb_get(); - gets a frame buffer from the camera.

and from the files you linked to for me I can see that that a frame buffer is this structure:
typedef struct {
uint8_t * buf; // Pointer to ...

OK well thanks again.

Me-no-dev thanks for your prompt reply.

I knew what "greyscale" meant in the general sense, but I had no way to know that, in this case, it means 8 bits, so your explanation is helpful

Anyhoooo - should I assume that this 8-bit data is organised as a 2D array of bytes?
Are there headers or footers ...

I am also interested in this.
Can someone please tell me where the real, detailed documentation is on the functions provided?
For example where do I find these answers:
1. What is the format of PIXFORMAT_GRAYSCALE, for example?
2. Where is the list of all the possible formats?
3. Where is the list ...