static int iccalternatespace(i_ctx_t * i_ctx_p, ref *space, ref **r, int *CIESubst)
{
    int components, code = 0;
    ref *tempref, ICCdict;

    if (!r_is_array(space))
        return_error(gs_error_typecheck);
    /* Validate parameters, check we have enough operands */
    if (r_size(space) != 2)
        return_error(gs_error_rangecheck);

    code = array_get(imemory, space, 1, &ICCdict);
    if (code < 0)
        return code;

    code = dict_find_string(&ICCdict, "N", &tempref);
    if (code < 0)
        return code;
    if (code == 0)
        return gs_note_error(gs_error_undefined);

    components = tempref->value.intval;

    code = dict_find_string(&ICCdict, "Alternate", &tempref);
    if (code > 0 && !r_has_type(tempref, t_null)) {
        *r = tempref;
    } else {
        switch (components) {
            case 1:
                code = name_enter_string(imemory, "DeviceGray", *r);
                break;
            case 3:
                code = name_enter_string(imemory, "DeviceRGB", *r);
                break;
            case 4:
                code = name_enter_string(imemory, "DeviceCMYK", *r);
                break;
            default:
                return_error(gs_error_rangecheck);
        }
    }
    *CIESubst = 1;
    return code;
}

The product does not correctly convert an object, resource, or structure from one type to a different type.