// function does not return until the entire image is decoded, so we "continue"
						// here to avoid wasted computation. Instead, reconstructBlock is called on each
						// accumulated block by the reconstructProgressiveImage method after all of the
						// SOS markers are processed.
						continue
					}
					if err := d.reconstructBlock(&b, bx, by, int(compIndex)); err != nil {
						return err
					}
				} // for j

			} else {
				err = UnsupportedError("unknown marker")
			}
		}
		if err != nil {
			return nil, err
		}
	}

	if d.progressive {
		if err := d.reconstructProgressiveImage(); err != nil {
			return nil, err
		}
	}
	if d.img1 != nil {
		return d.img1, nil
	}
	if d.img3 != nil {
		if d.blackPix != nil {
			return d.applyBlack()
		} else if d.isRGB() {