RDLC shows black background PNG image in PDF

moprsal

Hello,

I have a table with BLOB field. In the BLOB field is store PNG image with transparent background, I use IMPORT function to import an image to the field. I would like to create a report which shows images from the table. Everything goes well, I have a report, I have defined datasource and so on. When I run report from Nav, Preview is showed and it contains images with transparent background. But when I pres "export to PDF", PDF shows black background in images instead of transparent.

In RDLC layout I use object "Image " with Source="Datasource".

Do you have any experiences with export to PDF?

I also tried export image and use it in the report as external source, but the report shows "missing" image (red cross). What doI have to specify regarding this?

moprsal

On more thing I'm using Nav 2015 (8.00.40938)

SeeSharp

If you try a GIF does it work correctly?

moprsal

Yes, GIF works correctly. Do you have any idea how to print PNG?

SeeSharp

It's most likely that RDLC / PDF doesn't handle RGBA particularly well and ignoring the alpha channel. As this channel approaches 1 the opacity increases allowing for semi-transparency.

GIFs on the other hand just have a per-pixel color of "Transparent".

You could convert from PNG to GIF at run-time else use GIF for the reports?

moprsal

I was afraid of picture conversion. But there is no other way, as you wrote.

Right now, I dont have any function or SDK to convert PNG to GIF. Do you know how to convert it? Or could you recommend me a SDK/DLL for conversion?

SeeSharp

Untested, but you should be able to do it using the `DotNet` variable type:

Name	DataType	Subtype	Length
myBitmap	DotNet	System.Drawing.Bitmap.'System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'	
myImageFormat	DotNet	System.Drawing.Imaging.ImageFormat.'System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'	
myColour	DotNet	System.Drawing.Color.'System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'	


// Assuming file from filesystem
myBitmap := myBitmap.Bitmap('M:\y\Transparent.png');
myBitmap.MakeTransparent(myColour.Transparent);
myBitmap.Save('M:\y\NewTransparent.gif', myImageFormat.Gif);

jbellinger

I've the same issue. Were you able to resolve?