RescaleOp elements out of order

Question

I'm using the RescaleOp class to apply translucency to an image as needed.
This class takes an array of floats and uses them to scale the elements of a BufferedImage, like this:
float[] scale = { 1f, 1f, 1f, 0.5f };
However, the elements are not in expected order, and this is causing problems because I can't expect the order to always be consistent, and because I don't know how to programatically check the correct image order.
In one case, I have a buffered image of type TYPE_INT_ARGB.
But RescaleOp treats the elements as RGBA, with the last element influencing the alpha.
I have another image, TYPE_4BYTE_ABGR.
In this case, RescaleOp applies the four scale elements in a different order: RABG.
Just out of curiosity, I changed another image to use 4BYTE_ABGR instead of INT_ARGB, but RescaleOp still treats that image as RGBA.
It seems to be totally unpredictable how its going to apply the elements I give it. It does not match the image type.
How do I determine, programatically, what order it wants to treat the elements?

Answer 1

Nevermind.
Predictably, the case where I changed the image to 4BYTE_ABGR yet RescaleOp treated it the same way was a careless error.
So I can reliably use BufferedImage.getType() to get the image type and the element order.
RescaleOp reorders the elements as 1230, so that ARGB becomes RGBA and ABGR becomes RAGB.
I can't fathom why, and its not in the java doc, but it does so consistently, so I can work with that.
Sorry for posting this question before exploring it further. I would delete it, but I'm writing this on here so that if anyone else runs into the same situation, they'll find it on Google.