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PETROG images may be annotated to note or record important features, either for publication or just as an aide memoire, but PETROG takes this further by allowing lines drawn on an image, tracing  the outline of a grain, of an overgrowth, or a pore, to be used in calculations of grain or pore size and shape, fully integrated with the compositional point count description.


Grain Size Annotation

Isolated object logging


Analyses including heavy minerals and biostratigraphy require identification of objects on a slide, distinguishing them from background. PETROG will perform a preliminary scan of a slide, covering the entire Area of Interest, identifying the distinct features on it, whether or not they lie entirely in a single field of view. The geologist then has the option to visit each object in turn, to describe the object or to dismiss it from the list if it is not important. Overlapping objects may further be sub-divided if necessary.