The imageLoader module has the following prototype:
GOCRlib provides a default image loader, which handles the most common formats, and can convert images to any of the GOCRlib supported types (GOCR_BW, GOCR_GRAY, GOCR_COLOR) by using one of these symbols as argument. You should use GOCR_BW whenever you don't need extra information, since it's likely to take much less memory than the others.
It can be accessed with gocr_moduleAppend/etc by using ``default'' as argument. etc