[eluser]Teks[/eluser]
Let me see if I understood correctly what you are trying to do:
1) you need to run 2 (or more) image manipulation functions on a single image
2) you wish to end up with just ONE image file at the end (not multiple files, one for every manipulation you do)
So, I'm going to assume the following scenario: you have uploaded an image to a directory on your server, and now you wish to perform a crop, resize and a rotate, in succession - ending up with just ONE, final image in the directory.
If you have a close look at the Image Manipulation class in the User Guide, you will see that under the explanations for the 'resize()' function, it tells you how that if you use neither the 'create_thumb' nor the 'new_image' preferences, it will save over the original image. This supposedly applies also to the other functions. So, if you just leave 'new_image' empty, then you can perform the transforms in succession, and you should end up with just one, single transformed image.
I do not know if this would work with 'dynamic_output' set to TRUE - do let us know once you've had a chance to try it.