wants transparent image from pdf page

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   hi,

   i m trying to create .jpg or .png file from pdf page by below method


Dim QP As PDFLibrary=New PDFLibrary("..\..\QuickPDFDLL0816.dll")

LicenseKey = "****" '"...license_key..."

Result = QP.UnlockKey(LicenseKey)

If Result = 1 Then

    Dim strInputFilePath As String = "E:\file.pdf"

    QP.LoadFromFile(strInputFilePath, "")

    Dim FILEHANDLE As Integer = QP.DAOpenFile(strInputFilePath, "")

    Dim iNumPages As Integer = QP.PageCount()

    Dim nPage As Integer = 2

    QP.RenderPageToFile(72, nPage , 5, "D:\page1.png")

End If


as image saved successfully, but image has background color of pdf page (as in my case it is white)

i want to create transparent image from pdf page

i tried method  QP.SetTransparency() but it didn't work


how do i get transparent image from pdf page

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shilpa Members Profile Find Members Posts Beginner Joined: 28 Jun 12 Location: india Status: Offline Points: 1	Post Options Post Reply Quote shilpa Report Post Thanks(0) Quote Reply Topic: wants transparent image from pdf page Posted: 28 Jun 12 at 8:38AM
	hi, i m trying to create .jpg or .png file from pdf page by below method Dim QP As PDFLibrary=New PDFLibrary("..\..\QuickPDFDLL0816.dll") LicenseKey = "****" '"...license_key..." Result = QP.UnlockKey(LicenseKey) If Result = 1 Then Dim strInputFilePath As String = "E:\file.pdf" QP.LoadFromFile(strInputFilePath, "") Dim FILEHANDLE As Integer = QP.DAOpenFile(strInputFilePath, "") Dim iNumPages As Integer = QP.PageCount() Dim nPage As Integer = 2 QP.RenderPageToFile(72, nPage , 5, "D:\page1.png") End If as image saved successfully, but image has background color of pdf page (as in my case it is white) i want to create transparent image from pdf page i tried method QP.SetTransparency() but it didn't work how do i get transparent image from pdf page

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 29 Jun 12 at 8:33AM
	Hi! You won't get this with QuickPDF. QP renders the pdf-page like it is ... that's all. You should try a graphic tool after rendering the pdf-page. Transparency in QuickPDF means to make different objects shining through if one is over the other. Cheers and welcome here, Ingo Edited by Ingo - 29 Jun 12 at 8:36AM

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 02 Jul 12 at 1:26PM
	Hello, Quick PDF Library cannot create transparent images. The SetTransparency command is used to draw transparent objects on top of objects on the PDF page. You will need to use some other graphics library to convert the PNG to a transparent version. Also, you shouldn't mix the standard functions with the DA functions. - QP.DAOpenFile should only be used with other DA functions such as DAFindPage. You cannot open a file with QP.DAOpenFile() and then call QP.PageCount(). Andrew.