SUPPLEMENT dated as of October 1, 1997 to the Pledge and Security Agreement
(as  amended,   supplemented,  or  modified  from  time  to  time,  the  "Pledge
Agreement")  dated as of April 3,  1997  between  UNIDIGITAL  INC.,  a  Delaware
corporation (the "Pledgor"), and THE CHASE MANHATTAN BANK (the "Bank").

     Reference is hereby made to the Credit  Agreement dated as of April 3, 1997
(as  amended,   supplemented,  or  modified  from  time  to  time,  the  "Credit
Agreement")  among  Unidigital  Elements (NY), INC.,  Unidigital  Elements (SF),
Inc.,  Unidigital/Cardinal  Corporation  (now  known as  Unison  NY),  Inc.) and
Unidigital/Boris  Corporation  (the  "Borrowers"),  and The Chase Manhattan Bank
(the "Bank").

     Terms used herein as defined terms and not otherwise  defined  herein shall
have the meanings given thereto in the Credit Agreement.

     The  Pledgor has entered  into the Pledge  Agreement  to induce the Bank to
make the Loans to the Borrowers (the term "Borrowers" as used herein and as used
in the Pledge Agreement hereinafter referring to Unidigital Elements (NY), Inc.,
Unison (NY), Inc.  (formerly known as Unidigital  (NY),  Inc.), and Unison (MA),
Inc., (a Delaware  corporation  and the successor by merger to  Unidigital/Boris
Corporation  ("UBC")).  Pursuant  to (and as more  particularly  set  forth  in)
Sections 1 and 5 of the Pledge  Agreement,  the Pledgor is required to pledge to
and grant to the Bank a security interest in the stock or other equity interests
representing ownership of any new Subsidiary obtained in the future by the Bank.

     Accordingly,  and for other good and lawful  consideration  the receipt and
sufficiency of which are hereby acknowledged,  the Bank and the Pledgor agree as
follows:

     Section 1. (a) In accordance with Sections 1 and 5 of the Pledge Agreement,
the  Pledgor  by its  signature  below  (i)  represents  and  warrants  that the
representations  and warranties made by it as a Pledgor  thereunder are true and
correct on and as of the date hereof and, (ii) the Pledgor,  as further security
for the  payment and  performance  in full of its  Obligations  (as such term is
defined in the Pledge Agreement),  hereby transfers,  grants,  bargains,  sells,
conveys,  hypothecates,  pledges,  sets over and delivers  unto the Bank and its
successors and assigns,  and grants to the Bank, and its successors and assigns,
a first priority  security interest in (i) the shares of capital stock listed on
Schedule I (ii) all other property that may be delivered to and held by the Bank
pursuant to the terms of the Pledge Agreement,  (iii) subject to Section 6(a)(i)
of the Pledge Agreement, all payments of dividends and distributions, including,
without limitation,  all cash, instruments and other property, from time to time
received,  receivable  or otherwise  paid or  distributed,  in respect of, or in

<PAGE>

exchange  for or upon  the  conversion  of the  securities  and  other  property
referred to in clauses (i) or (ii) above, (iv) subject to Section 6(a)(i) of the
Pledge  Agreement,  all rights and privileges of the Pledgor with respect to the
securities and other property  referred to in clauses (i), (ii), or (iii) above,
(v) any and all custodial  accounts in which any of the foregoing  property (and
any property  described in the following clause (vi)) may be deposited,  and any
securities  entitlements  relating thereto,  and (vi) all proceeds of any of the
foregoing.  Schedule  I  hereto  shall  supplement  Schedule  I  to  the  Pledge
Agreement,  and shall be deemed a part  thereof  for all  purposes of the Pledge
Agreement.

     (b) Without limiting Section 1(a), the Pledgor hereby agrees,  acknowledges
and confirms that as pledgee of all of the  outstanding  shares of UBC under the
Pledge  Agreement  the Bank  obtained  and has  retained a  continuing  security
interest in the shares of the  capital  stock  described  on Schedule I upon the
merger of UBC into the issuer of such capital stock.

     Section  2. The  Pledgor  represents  and  warrants  to the Bank  that this
Supplement  has  been  duly  authorized.   executed  and  delivered  by  it  and
constitutes its legal, valid and binding  obligation,  enforceable against it in
accordance  with  its  terms,  subject  to  applicable  bankruptcy,  insolvency,
reorganization,  moratorium or other laws affecting  creditors' rights generally
and subject to general principles of equity (regardless of whether considered in
a proceeding at law or in equity).

     Section 3. This Supplement may be executed in two or more counterparts,
each of which  shall  constitute  an  original,  but all of  which,  when  taken
together,  shall  constitute but one instrument.  This  Supplement  shall become
effective  when the Bank shall have  received  counterparts  of this  Supplement
that, when taken together, bear the signatures of the Pledgor and the Bank.

     Section  4. The  Pledgor  has  delivered  herewith  (i) in  respect  of the
additional  Pledged  Shares undated stock powers duly executed in blank or other
instruments  of  transfer  satisfactory  to the Bank  and  that  the Bank  shall
reasonably  request  in  connection  with  the  Pledgor  as  a  pledgor  or  its
Collateral,  and (ii) all  instruments,  documents,  or agreements that the Bank
shall request in connection with the  establishment  or perfection of the pledge
or the Liens arising under the Pledge Agreement,  including, without limitation,
all Uniform  Commercial  Code financing  statements  duly executed and in proper
form for filing as the Bank shall  request in respect of the Liens arising under
the  Pledge  Agreement  and in  respect of the  termination  of any other  Liens
previously encumbering any Collateral of the Pledgor.

     Section 5. Except as expressly  supplemented  hereby,  the Pledge Agreement
shall remain in full force and effect.



                                      -2-
<PAGE>

     SECTION  6.  THIS  SUPPLEMENT  SHALL  BE  GOVERNED  BY,  AND  CONSTRUED  IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEV YORK.

     Section  7. In case  any one or more of the  provisions  contained  in this
Supplement should be held invalid,  illegal or unenforceable in any respect, the
validity,  legality and  enforceability  of the remaining  provisions  contained
herein  and in any  other  Loan  Document  shall not in any way be  affected  or
impaired.  The  parties  hereto  shall  endeavor in good faith  negotiations  to
replace the invalid illegal or  unenforceable  provisions with valid  provisions
the economic  effect of which comes as close as possible to that of the invalid,
illegal or unenforceable provisions.

     Section  8. The  Pledgor  agrees  to  reimburse  the Bank for its  expenses
incurred in connection  with this  Supplement,  including the  reasonable  fees,
other charges and disbursements of counsel.

     IN WITNESS WHEREOF, the Pledgor and the Bank have duly executed this
Supplement as of the day and year first above written.

                                        UNIDIGITAL INC.


                                        By /s/ William E. Dye            
                                          -------------------------------
                                              Name:  William E. Dye
                                              Title:  President


                                       THE CHASE MANHATTAN BANK


                                       By:/s/ Eugene J. Ward
                                          -------------------------------
                                              Name:  Eugene J. Ward
                                              Title:  V P

                                      -3-
<PAGE>


                                                                      Schedule I
                                                                   to Supplement

                                  PLEDGED STOCK



Issuer                    Number of Shares                   Percentage
------                    ----------------                   ----------

1. Unison (MA), Inc., a 
   Delaware corporation   100                                100%