Soft Mask with Type 1 (Function-based) Shading

I want to use a custom function as the soft mask - Type 1 (Function-based) Shading
But a function, does not generate alpha to be used with SMask, so my questions are
Is there a way to make a Type 1 (Function-based) Shading to return alpha?
Is there a way to transfer R, G or B layer into alfa?
If not, sould I use Soft mask with Luminosity?
Any examples somewhere of using functions as soft masks (with alpha or luminosity types)?
  Thank you!

You should be able to do that just fine by using a standard alpha-based soft mask.   Use a DeviceGray-based shading and you should be fine.

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    I am using Acrobat Professional 7 for Windows, but I don't believe the situation has changed in Acrobat 9.
    I have a simple hand-crafted pdf that is designed to test shading patterns with extend regions when used with stitching (Type 3) functions. These behave according to the spec in most cases, but there is a special case where they don't. I've included the job at the end of this message.
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    This is my hand-crafted job for testing shading patterns with Type 3 functions. The job is hand crafted, and I haven't gone to the trouble of setting the xref table or setting the stream lengths, but Acrobat does repair the file and it behaves the same as other, real-world, jobs
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    Philip, thankyou for offering to look at this.
    I have attached 'FunctionType 3 boundary.pdf' which was the original file I attempted to post. The file 'AcrOut Domain 0_3-0_7.png' makes it clear what I am seeing in Acrobat. I would also like to augment my original post a little to point out incompatibilities between Acrobat and CPSI.
    1. From my PoV, compatibility between Acrobat and CPSI is important, so I've also attached a file that contains equivalent PostScript. On my Ricoh Aficio with CPSI (3016.203) inside it, the job is rendered in solid cyan as I would expect given that the domain of the shading is restricted to [0.3 0.7].
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    DATA_LENGTH                               NOT NULL NUMBER
    DATA_PRECISION                                     NUMBER
    DATA_SCALE                                         NUMBER
    NULLABLE                                           VARCHAR2(1)
    COLUMN_ID                                          NUMBER
    DEFAULT_LENGTH                                     NUMBER
    DATA_DEFAULT                                       LONG
    NUM_DISTINCT                                       NUMBER
    LOW_VALUE                                          RAW(32)
    HIGH_VALUE                                         RAW(32)
    DENSITY                                            NUMBER
    NUM_NULLS                                          NUMBER
    NUM_BUCKETS                                        NUMBER
    LAST_ANALYZED                                      DATE
    SAMPLE_SIZE                                        NUMBER
    CHARACTER_SET_NAME                                 VARCHAR2(44)
    CHAR_COL_DECL_LENGTH                               NUMBER
    GLOBAL_STATS                                       VARCHAR2(3)
    USER_STATS                                         VARCHAR2(3)
    AVG_COL_LEN                                        NUMBER
    CHAR_LENGTH                                        NUMBER
    CHAR_USED                                          VARCHAR2(1)
    V80_FMT_IMAGE                                      VARCHAR2(3)
    DATA_UPGRADED                                      VARCHAR2(3)
    HIDDEN_COLUMN                                      VARCHAR2(3)
    VIRTUAL_COLUMN                                     VARCHAR2(3)
    SEGMENT_COLUMN_ID                                  NUMBER
    INTERNAL_COLUMN_ID                        NOT NULL NUMBER
    HISTOGRAM                                          VARCHAR2(15)
    QUALIFIED_COL_NAME                                 VARCHAR2(4000)
    I can see that column in ALL_TAB_COLS either way.

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