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RenderDocumentToFile with transparent images

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bbenc View Drop Down
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Joined: 20 Dec 19
Location: Australia
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bbenc Quote  Post ReplyReply Direct Link To This Post Topic: RenderDocumentToFile with transparent images
    Posted: 06 Jan 20 at 6:01AM
I originally posted same topic but it hasn't been resolved and my trial expires soon and I need to know if this product will meet my needs (hence the new post):

I am trying to add a watermark (transparent image) to a image file. Below is some basic code to show that you can create a pdf with watermarks but using the same code it does not produce the same results when creating an image file (.SaveToFile vs .RenderDocumentToFile). The image file (.RenderDocumentToFile) only shows the overlaid image with 0 transparency.

Can anyone please help me create an image file with transparent images?

    strImportFolder = "E:\FOXIT\Testing"
    strImportFile = "IMG_3560"
    strImportFileExt = "jpg"
   
    strWMFolder = "E:\FOXIT\Testing"
    strWMFile = "TestWM"
    strWMFileExt = "jpg"
   
    strExportFolder = "E:\FOXIT\Testing\"
    strExportFile = "Image_3560"
    strExportFileExt = "jpg"
   
    dblPage = 1
    dblTransparency = 90
   
    Set objPDF = CreateObject(gcstrPDFLibrary)
    If objPDF.UnlockKey(gcstrPDFLicense) = 1 Then
        Call objPDF.AddImageFromFile(strImportFolder & "\" & strImportFile & "." & strImportFileExt, 0)
        dblWidth = objPDF.ImageWidth()
        dblHeight = objPDF.ImageHeight()
        ret = objPDF.SetPageDimensions(dblWidth, dblHeight)
        ret = objPDF.DrawImage(0, dblHeight, dblWidth, dblHeight)
        ret = objPDF.SelectPage(dblPage)
        ret = objPDF.NormalizePage(0)
        ret = objPDF.SetOrigin(1)
        dblContentStream = objPDF.NewContentStream
        ret = objPDF.SelectContentStream(dblContentStream)
        ret = objPDF.SaveState
        dblWMImageID = objPDF.AddImageFromFile(strWMFolder & "\" & strWMFile & "." & strWMFileExt, 0)
        ret = objPDF.SelectImage(dblWMImageID)
        ret = objPDF.SetTransparency(dblTransparency)
        ret = objPDF.DrawImage(0, 0, objPDF.PageWidth, objPDF.PageHeight)
        ret = objPDF.LoadState
        ret = objPDF.MoveContentStream(dblContentStream, objPDF.ContentStreamCount)
        Call objPDF.CombineContentStreams
        ret = objPDF.SaveToFile(strExportFolder & "\" & strExportFile & ".pdf")
        ret = objPDF.RenderDocumentToFile(300, 1, 1, 1, strExportFolder & "\" & strExportFile & "." & strExportFileExt)
    End If
    Set objPDF = Nothing


Edited by bbenc - 06 Jan 20 at 6:11AM
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Ingo View Drop Down
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Joined: 29 Oct 05
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 20 at 8:36AM
QuickPDF embeds several image-/render libraries for rendering.
These libraries themself are offering a lot of more functionalities - your transparency-options as well.
QuickPDF is for pdf - Render libraries are more for images ;-)
The described special needs you won't feed with the actual version of QuickPDF.
For this issue you should dive deeper into the libraries like Cairo, PDFium, GDI+ or AGG.


Cheers,
Ingo

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