Simplification and bugfix

def multicrop_pic(image: Image, mindim, maxdim, minarea, maxarea, objective, threshold):

    iw, ih = image.size

    err = lambda w, h: 1-(lambda x: x if x < 1 else 1/x)(iw/ih/(w/h))

    try:

    w, h = max(((w, h) for w in range(mindim, maxdim+1, 64) for h in range(mindim, maxdim+1, 64)

        if minarea <= w * h <= maxarea and err(w, h) <= threshold),

            key= lambda wh: ((objective=='Maximize area')*wh[0]*wh[1], -err(*wh))

        key= lambda wh: (wh[0]*wh[1], -err(*wh))[::1 if objective=='Maximize area' else -1],

        default=None

    )

    except ValueError:

        return

    return center_crop(image, w, h)