How to import an alpha channel from .PSD file?

I have a photoshop file (.psd) with an alpha channel. When I import this file into AE, I do not see the alpha being available or perhaps I don't know how to find it. I've followed this instruction but nothing happens afterwards. Okay, so my question is, when I drop the .psd file into my comp, how or where do I enble the alpha channel?

I am not sure this a bug.
It could be. But note that I can produce an identical case in which this behavior is not a bug.
The thing is, in the world of video applications, Alpha Channel means "fourth channel used to store transparency values".
In Photoshop, it normally means the same thing, but it can also mean "arbitrary channel created and stored for whichever reason the user may want it on the future". Typically, to save a selection so that it can be retrieved later. In fact, you can have many of these arbitrary channels.
So, imagine this scenario:
1. User makes a selection of the outline of the house.
2. Instead of cutting the pixels outside the house, or creating a layer mask, the user goes to the Channels panel and hits the "Save selection as channel" button (or equivalent menu command).
Photoshop creates a fourth channel (or even a fifth or a sixth if there were additional channels already), which is called "Alpha" but the user never did anything to make the information in that channel produce transparency.
If after making the selection, the user would have cutted pixels or created a layer mask, then that operation would be relfected on what we normally consider as Alpha channel.
In this case, what you can do is go to channels pannel, control click the thumbnail so that the channel is loaded as selection, then create a layer mask (Layer > Layer Mask > Current selection) from that selection. That's it.

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and given me them as sequential files.
On gfx without alpha I open then in quicktime, open a sequential files then export to dv.
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http://www.apple.com/quicktime/feedback
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>
Soumitra Sinha wrote:
> Hello Vijay
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DATA: BEGIN OF bdc OCCURS 0,
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         MEINS(3),
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EXPORTING
    FILENAME                      = 'C:\Documents and Settings\dilipkumar.b\Desktop\soft.txt'
   FILETYPE                       = 'ASC'
   HAS_FIELD_SEPARATOR            = ','
HEADER_LENGTH                 = 0
READ_BY_LINE                  = 'X'
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CODEPAGE                      = ' '
IGNORE_CERR                   = ABAP_TRUE
REPLACEMENT                   = '#'
CHECK_BOM                     = ' '
VIRUS_SCAN_PROFILE            =
NO_AUTH_CHECK                 = ' '
IMPORTING
FILELENGTH                     =
HEADER                         =
TABLES
    DATA_TAB                      = BDCDATA
EXCEPTIONS
FILE_OPEN_ERROR               = 1
FILE_READ_ERROR               = 2
NO_BATCH                      = 3
GUI_REFUSE_FILETRANSFER       = 4
INVALID_TYPE                  = 5
NO_AUTHORITY                  = 6
UNKNOWN_ERROR                 = 7
BAD_DATA_FORMAT               = 8
HEADER_NOT_ALLOWED            = 9
SEPARATOR_NOT_ALLOWED         = 10
HEADER_TOO_LONG               = 11
UNKNOWN_DP_ERROR              = 12
ACCESS_DENIED                 = 13
DP_OUT_OF_MEMORY              = 14
DISK_FULL                     = 15
DP_TIMEOUT                    = 16
OTHERS                        = 17
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
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loop at bdcdata.
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perform bdc_field       using 'BDC_CURSOR'
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perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_field       using 'RC29N-MATNR'
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perform bdc_field       using 'RC29N-STLAN'
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perform bdc_dynpro      using 'SAPLCSDI' '0110'.
perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_field       using 'RC29K-BMENG'
                              '1'.
perform bdc_field       using 'RC29K-STLST'
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perform bdc_field       using 'BDC_CURSOR'
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perform bdc_field       using 'BDC_CURSOR'
                              'RC29K-LABOR'.
perform bdc_field       using 'BDC_OKCODE'
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perform bdc_dynpro      using 'SAPLCSDI' '0140'.
perform bdc_field       using 'BDC_CURSOR'
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perform bdc_field       using 'BDC_OKCODE'
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perform bdc_field       using 'BDC_OKCODE'
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perform bdc_field       using 'BDC_CURSOR'
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perform bdc_field       using 'RC29P-IDNRK'
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perform bdc_field       using 'RC29P-MENGE'
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perform bdc_field       using 'BDC_OKCODE'
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perform bdc_field       using 'BDC_CURSOR'
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perform bdc_field       using 'RC29P-SANKA'
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endloop.
       Start new screen                                              *
FORM BDC_DYNPRO USING PROGRAM DYNPRO.
CLEAR iBDCDATA.
iBDCDATA-PROGRAM = PROGRAM.
iBDCDATA-DYNPRO   = DYNPRO.
iBDCDATA-DYNBEGIN = 'X'.
APPEND ibDCDATA .
ENDFORM.
       Insert field                                                  *
FORM BDC_FIELD USING FNAM FVAL.
IF FVAL <> NODATA.
    CLEAR iBDCDATA.
    iBDCDATA-FNAM = FNAM.
    iBDCDATA-FVAL = FVAL.
    APPEND iBDCDATA .
ENDIF.
ENDFORM.

Hi,
the BDCDATA structure must be fnam, fval,dynbegin,dynpro,program.
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How to import an alpha channel from .PSD file?

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