CanvasColor color to use when converting images with alpha channel to images without alpha channel.
Default is WHITE.
If the rect is not empty, the image will be cropped to this rect before processing.
True if the image should be processed in live mode by scanners configured with ProcessingMode.AUTO. Should be set to true for images that come from some video stream, e.g. from the camera or a video file.
Basic options for loading image.