I'm a new Kepler and struggling to apply a single actor (e.g. Image Converter) to a batch of objects (e.g. a directory of images, as represented by the array generated by Directory Listing).
I've read the documentation and searched the forums, and tried modifying examples, but I'm not understanding something paradigmatic, and would appreciate a tip: how do you pipe an array of files through single-file actors? EXAMPLE: In Kepler 1.0.0, 03-ImageDisplay.xml uses an SDC director, and specifies: Constant Image Filename --> Image Converter --> ImageJ In an attempt to converter a *directory* of images, I tried adding a Directory Listing actor: Constant Dirname --> Directory Listing --> Image Converter --> ImageJ ...however this generates an error, as Image Converter will only act on a string, not an array. So I tried Constant Dirname --> Directory Listing --> Array to Sequence --> Image Converter --> ImageJ ...which almost works if I hand-specified the number of Array elements in the directory ahead of time), but still only processed the first file listed in the string (Picture 1.png) -- I'm assuming it just throws the rest of the string away. I'm not understanding something about how one processes a list in a Kepler workflow -- I've looked through Array Operation and Iterative Operation actors, and none of them seem to be analogous to an imperative programming loop. Am I using the wrong kind of director? Something else? Thanks for your help. BACKGROUND: My larger goal is to adapt a frame based image processing workflow into Kepler (it is currently a combination of python, javascript, and bash scripts). To illustrate, one part of the workflow takes a heterogeneous collection of images (all file types and sizes) and copies them to a new directory as a collection of standardized collection jpegs. Another part of the workflow dumps a movie to a frame directory of jpegs, then runs multiple image measurement and image processing operations (e.g. ImageJ, MATLAB) on each frame and saves the results to a text file.
