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                                                                     EXHIBIT 5.1



                                 October 7, 1997


Raster Graphics, Inc.
3025 Orchard Parkway
San Jose, CA  95134

        REGISTRATION STATEMENT ON FORM S-3
        ----------------------------------

Ladies and Gentlemen:

        We have examined the Registration Statement on Form S-3 to be filed by
you with the Securities and Exchange Commission on or about October 7, 1997 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of a total of 73,475 shares of your Common
Stock (the "Shares"), to be sold by certain stockholders listed in the
Registration Statement (the "Selling Stockholders"). As your legal counsel, we
have examined the proceedings taken and are familiar with the proceedings
proposed to be taken by you in connection with the sale of the Shares by the
Selling Stockholders in the manner set forth in the Registration Statement in
the section entitled "Plan of Distribution."

        It is our opinion that the Shares, when sold by the Selling Stockholders
in the manner referred to in the Registration Statement, will be legally and
validly issued, fully paid and nonassessable.

        We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever it appears in the
Registration Statement and any amendments to it.

                                        Sincerely,

                                        VENTURE LAW GROUP
                                        A Professional Corporation


                                        /s/ VENTURE LAW GROUP