Loads an image region from an already open file. Returns NULL if failed. \n
* This will call \ref imFileReadImageInfo and \ref imFileReadImageData. \n
* index specifies the image number between 0 and image_count-1. \n
* The returned image will be of the same color_space and data_type of the image in the file,
* or will be a Bitmap image. \n
* Attributes from the file will be stored at the image.
* See also \ref imErrorCodes. \n
* For now, it works only for the ECW file format.
*
* \verbatim ifile:LoadRegion(index, bitmap, xmin, xmax, ymin, ymax, width, height: number) -> image: imImage, error: number [in Lua 5] \endverbatim
* Default index is 0.
* \ingroup imgfile
Loads an image region from an already open file. Returns NULL if failed. \n * This will call \ref imFileReadImageInfo and \ref imFileReadImageData. \n * index specifies the image number between 0 and image_count-1. \n * The returned image will be of the same color_space and data_type of the image in the file, * or will be a Bitmap image. \n * Attributes from the file will be stored at the image. * See also \ref imErrorCodes. \n * For now, it works only for the ECW file format. * * \verbatim ifile:LoadRegion(index, bitmap, xmin, xmax, ymin, ymax, width, height: number) -> image: imImage, error: number [in Lua 5] \endverbatim * Default index is 0. * \ingroup imgfile