How to insert an image with a transparent background ?

[louis]

During the creation of a pdf file, I would like to transform the white background color of an image to a transparent background. SwapColorEx 0, 0, 0 produces black background.

Code: Select all

        GDIA.PdfNewPdf(path, "", "", "", "") Then
        GDIA.PdfSetMeasurementUnits (2) ' cm
        ImageA = GDIa.PdfAddImageFromGdPictureImage(GDVA.GetNativeImage)       

        GDIB.CloseNativeImage
        GDIB.SetNativeImage (GDVB.GetNativeImage)       
        GDIB.SwapColorEx 0, 0, 0
        ImageB = GDIB.PdfAddImageFromGdPictureImage(GDIB.GetNativeImage)

        Call GDIA.PdfDrawImage(ImageB, 0, 0, width, height)


[louis]

Sorry, the code is :

Code: Select all

        GDIA.PdfNewPdf(path, "", "", "", "") Then
        GDIA.PdfSetMeasurementUnits (2) ' cm

        ImageA = GDIa.PdfAddImageFromGdPictureImage(GDVA.GetNativeImage)       
        Call GDIA.PdfDrawImage(ImageA, 0, 0, widthA, heightA)  ' a 1st image in the PDF

        GDIB.SetNativeImage (GDVB.GetNativeImage)              ' a 2nd image to put on the 1st image
        GDIB.SwapColorEx 0, 0, 0
        ImageB = GDIB.PdfAddImageFromGdPictureImage(GDIB.GetNativeImage)
        Call GDIA.PdfDrawImage(ImageB, 0, 0, widthB, heightB)


[Loïc]

Hi,

Transparency in PDF (also called Soft Mask) is not available. We have plans to introduce it but only in a future release of the GdPicture.NET editions.
What I can suggest is to convert transparent pixel to white (background color of the PDF page) to simulate the transparency.

With best regards,

Loïc

[louis]

Thanks for the information. We'll be very insterested in the new feature.
In the meantime, we have to try to insert the image in a white homogeneous area in our PDF files.

Louis