Change background image to greyscale programmatically using VBA in PowerPoint 2010?

For a PowerPoint 2010 add-in for our corporate template, I've got a macro button that lets them select an image from the corporate library and insert that as the slide background.  I want to take that one step further and, if they select a specific layout, convert that background image to grayscale.  This is easy to do manually (right-click, format background, picture color, recolor, greyscale), but I need to do it with VBA.  Here is what I've tried:
Set fd = Application.FileDialog(msoFileDialogFilePicker)
fd.Title = "Select Background Image"
fd.InitialFileName = contentlibraryfolder & "\Background Images"

With fd
    If .Show = -1 Then
        pickedpix = .SelectedItems(1)
    Else
        Exit Sub
    End If
End With

Set fd = Nothing

currentslide.FollowMasterBackground = False

currentslide.Background.Fill.UserPicture (pickedpix)

If InStr(currentslide.CustomLayout.Name, "B&W") Then
    currentslide.Background.Fill.PictureEffects.Insert(msoEffectSaturation).EffectParameters(1).Value = 0
End If

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This works great up to "currentslide.Background.Fill.UserPicture (pickedpix)."  But that last line fails to turn the picture to grayscale.  But it doesn't give me an error either.  I know I'm very close because this same pictureeffects method will turn a regular picture on the foreground of the slide to grayscale, but it's not changing the background.

I'm presenting this in 9 hours at a corporate meeting and would love to include this feature if someone can point me in the right direction.

Thanks!
Bryce BassettFreelance VBA programmerAsked:
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JSRWilsonCommented:
You cannot apply picture effects to a background image. You would need to modify an imaga and apply as a background.
0
Rgonzo1971Commented:
Hi,

pls try
Sub macro()
'Set currentslide = ActivePresentation.Slides(1)
Set fd = Application.FileDialog(msoFileDialogFilePicker)
fd.Title = "Select Background Image"
fd.InitialFileName = contentlibraryfolder & "\Background Images"

With fd
    If .Show = -1 Then
        pickedpix = .SelectedItems(1)
    Else
        Exit Sub
    End If
End With

Set fd = Nothing

currentslide.FollowMasterBackground = False

currentslide.Background.Fill.UserPicture (pickedpix)

If InStr(currentslide.CustomLayout.Name, "B&W") = 0 Then
    Set oPic = currentslide.Shapes.AddPicture(FileName:=pickedpix, _
        LinkToFile:=msoTrue, SaveWithDocument:=msoTrue, Left:=0, Top:=0, Width:=-1, Height:=-1)
    oPic.PictureFormat.ColorType = msoPictureBlackAndWhite
    strPicBWName = Left(pickedpix, InStrRev(pickedpix, ".") - 1) & "_bw.jpg"
    oPic.Export strPicBWName, ppShapeFormatJPG
    currentslide.Background.Fill.UserPicture (strPicBWName)
    Kill strPicBWName
    oPic.Delete
Else
    currentslide.Background.Fill.UserPicture (pickedpix)
End If

End Sub

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JSRWilsonCommented:
Or maybe just have two master layout one gray and one color. They can easily be applied in code.
0
Bryce BassettFreelance VBA programmerAuthor Commented:
A few modifications needed, but mostly there.
0
Bryce BassettFreelance VBA programmerAuthor Commented:
Thanks, Both.  Clever solution to import the image, modify it, export it, pull it in as the background, the nuke the temporary files!  

I did have to make a couple modifications.  ColorType = msoPictureBlackAndWhite gave me a literally 2 toned image, so I want back to the grayscale effect from my original post.  

Also (and you could not have known this), the contentlibraryfolder from which the picture is imported is a read-only network location to which I cannot write files, so I had to parse out the filename and save the temporary file to a local folder.  Here's what I ended up with:
If InStr(currentslide.CustomLayout.Name, "B&W") > 0 Then
    oPicFileName = Right(pickedpix, Len(pickedpix) - InStrRev(pickedpix, "\"))
    strPicBWName = Environ("appdata") & "\" & Left(oPicFileName, InStrRev(oPicFileName, ".") - 1) & "_bw.jpg"
    Set oPic = currentslide.Shapes.AddPicture(FileName:=pickedpix, _
        LinkToFile:=msoTrue, SaveWithDocument:=msoTrue, Left:=0, Top:=0, Width:=-1, Height:=-1)
    oPic.Fill.PictureEffects.Insert(msoEffectSaturation).EffectParameters(1).Value = 0
    oPic.Export strPicBWName, ppShapeFormatJPG
    currentslide.Background.Fill.UserPicture (strPicBWName)
    Kill strPicBWName
    oPic.Delete
Else
    currentslide.Background.Fill.UserPicture (pickedpix)
End If

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Thanks for helping me solve this!
0
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