Quote Originally Posted by ntenny View Post
... Doesn't that mean that I end up with the same blank shadows due to underexposure that I'd get in a negative? Changes in development can raise or lower the curve, but they can't create shadow information that wasn't there.

Does this mean that in practice very little can be done to extend the dynamic range of slide film? To extend the shadows you'd have to overexpose, but that blows the highlights; to extend the highlights you'd underexpose, but that gives you no information in the shadows; and there doesn't seem to be an analogue to compensating development that would help keep the highlights from blowing out. Have I got it right?

That's where my confusion lies, also. Beyond the specularities that come from say, light streaming through the trees, exposing for a highlight makes sense from a density perspective. That allows the highlights to record information. But how can detailed information be recovered from the shadows, if they drop to, say Zone II?