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Jeff,
The chromosphere extends above the photosphere (basically the "surface" of the Sun we see in White light - sunspots, granulation and faculae) by some 2,500 Km
The lower levels of the chromosphere, around 500Km are being imaged when we work "off band" in the wings of Ha. When we go "on band" in Ha we begin to record detail up around 1,500Km. (sunspots, plage, filaments, flares, prominences, Ellerman bombs, spiculae and the surrounding fibrils of any ARs driven by the magnetic fields)
In parallel to the above when we image in CaK, at (or close to central wavelength) we record the solar detail at 800-1,500 Km heights. The most prominent feature is the calcium "network" (or "chromospheric network" of cells) and bright flocculi surrounding the cells(and occasional filament or prom). The cells in the network can be 30,000Km in size and last 10 hr or more. The brighter areas have some commonality with the plage areas seen in Ha.
The colours of the presented images is very subjective. Each observer has his/her likes and dislikes. They are generally "yellow, gold, orangey red" for Ha, "blue violet" for Cak and a "white pink" for WL - loosely based on wavelength.
(A Plug! - "Imaging Sunlight -using a digital SHG" has a few good chapters on commercial solar filters and what can be observed at various wavelengths and resolution"
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