Hi, I am a true fresh here and trying to build a HDR photoshop plugin, with an existing HDR merging algorithm in a static C lib. What I need to do is just to provide a file dialog to read in several images, then to process pixels of these images with the C lib, and last return a result image. In this case, which type of plugin should I focus? Automation, filter, or any others ? Besides that, what should be the key to read files and get their pixels? Would anyone be so kind to offer a hint? Thank you very much!