I haven't built to many .rdl's before. Probably only a dozen or so, but never had to get into more complicated processes. I have it hard coded for width which is fine, but the height of the cells can change. So it's not always centered in respect to that axis.
I am not to sure what the .NET memory stream is.
Looking at the following:
It seems to be getting the dynamic width/height of the image, in my case which is static.
So i don't see a need for getting the image specs, since I will always have them. The difficulty comes in when I have the cell set to dynamic height for text. I will never know what the cell height is, which is why i was hoping there was a function that grabs the cell height, unless it is calculated at run time..
Seems there many not be any options for a centering an image in a cell with a dynamic height.