What capability is related to TWAIN document type?

Question

I am trying scan images using twain.

I see most scanner manufactures' utilities have an option called "Document Type", "Color Matching", or "Scanner Type", whatever. (Not b/w or rgb option!)

They usually let me select between none , text , image , and mixed text & image modes, as seen in the screenshot:

Question:

What twain capability should I use, to switch between these document types?

Answer 1

Actually, twain doesn't define a "Document Type" capability natively. They are defined by each manufacturers (if any).

For example, I found that some Kodak scanners use capability 0x80AC with type TWTY_UINT16 to define document type.