How to get pixel data in the format I want

I'm writing a format plug-in and am having some difficulty getting the pixel data from photoshop in the format I want. From what I gather from the documentation in the SDK I need to specify the following to tell photoshop what format to deliver my pixels in:
theRect
loPlane
hiPlane
data
colBytes
rowBytes
planeBytes
planeMap
I specify all of these appropriately for a 32 bit rgba8888 uncompresssed image and it works just fine... but ONLY if the image I load in the first place matches the format I am requesting. If the image I load is some other format, like a 256 color image with a palette, gFormatRecord->advanceState() just fails with a nebulous -30500 error code (formatBadParameters) instead of delivering pixel data.
So my big question is this: Is Photoshop capable of doing the conversion and delivering the pixels to my format plug-in in my requested format? If it CAN do it, what might I be doing wrong? Please help! Thanks!!

You noticed you can use the planeMap[] array to permute the channels. It's not so obvious that Photoshop should offer generalised bit depth/colour space/palette processing. It can be argued that's the role of the plugin itself: to mediate between Photoshop's native image data (which it does offer conveniently) and whatever arbitrary image format the user requires. At least, that's what most of
my plugins do.
Sure, there are a few obvious conversions, but you have to stop somewhere... Sooner or later you'll be implementing stuff on the Photoshop side that
should be in a plugin. I don't have a big problem with the line drawn in the current API.

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How to get pixel data in the format I want

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