Adding java BufferedImage as a Picture to a Slide

Aspose.Slides Product Family
1

I'm just investigating using Aspose.Slides in our application to produce PPT files and have downloaded the demo programs and started using it. I've hit a problem that I hope someone has already dealt with...

We create custom images in our Java application using code like that below:

BufferedImage im= new BufferedImage(sizeX , sizeY, BufferedImage.TYPE_INT_ARGB);

Graphics2D temp = im.createGraphics();

paint(temp); // paints objects and text

I'd like to then use this image to populate a aspose.slides.Picture object, but the only public method is to pass it an InputStream. I don't want to have to write my image out to a temporary file and create an InputStream to get it back.

Are there any plans on implementing a Picture constructor that lets me pass in a java Image class instead?

A problem I'm having with this method is that the portions of the image that I did not paint anything onto are becoming opaque when I write it to a GIF file using ImageIO. When this is then added as a Picture, the background comes out black in the slide - for example, when I'm drawing a circle, the result is a circle inside a black square, rather then a nice circle image with transparent background. I'm sure this is a problem with how I'm writing the image to the GIF file, which I'd like to avoid in the first place anyway - however any alternate solution needs to deal with this transparency problem too. My guess is I have to pick a color I don't plan to use, fill the image background with it, then declare that color to be tranparent to Aspose software - just haven't tried that yet.

Thanks in advance for any ideas you have.

This message was posted using Page2Forum from Technical Articles - Aspose.Slides for .NET and Java
2

Dear mass,

Thanks for considering Aspose.Slides.

If I am not mistaken, InputStream can also be stream from memory not just from file. If it is so, then you don’t need to write image out to a temporary file. I will let you know about it.

3

Hello Maas,

Most probably all your problems just because of GIF format. You should remember,
MS PowerPoint uses only 2 types of images Jpeg and Png. Save image in Png format
if you need transparency or high quality image and in Jpeg format in other cases.

4

Thanks for the tip. I'll look into this.

Looks like I can use an ImageIO.write() method - writing to an OutputStream, then maybe use some sort of IO pipe class to route it back to an Input Stream - haven't found that combination yet.

The reminder to use PNG format was also very helpful - thanks. I've never written png files, but I'm assuming ImageIO will handle it.

Thanks for your help - I'll keep working on it.

Robin