AnnPicture with AnnImageObject annocation with alpha blending?

Hi,

I was looking for any example how to set up Alpha blending, even only to emulate alpha blending behaviour would be great.
And closest I've got was to use ImageAttributes.SetKeyColor

unfortunetly following line has no effect at all:
pic.ImageAttributes.SetColorKey(Color.FromArgb(0, 0, 0), Color.FromArgb(240, 240, 240));
this should get barelly visible image.

Need to allow movement of image with semi transparency inside RasterViewer,
so I could get coordinates and angle of AnnPicture after user makes position.

Is there any simpler way I can do this in RasterViewer?


thank you
and best regards

Please answer the following questions:
- Which version of LEADTOOLS are you using?
- Which annotations assembly (e.g. Leadtools.Annotations.Core) , because in some versions we have 2 different annotation implementations.
- Do you mean you want to display the image with partial transparency (translucent)?
If yes, and you are using v19 Leadtools.Annotations.Core, you can do this using the AnnObject.Opacity property. You can find more information here:
https://www.leadtools.com/help/leadtools/v19/dh/ac/wleadtools.annotations.core~leadtools.annotations.core.annobject~opacity.html

Thanks,
Maen Badwan
LEADTOOLS Technical Support

- We are using Leadtools PACS and Imaging version 17.5
- Assembly "Leadtools.Annotations" low level with AnnAutomationManager
- Yes translucency. The idea is to have several images that can be independently moved, or rotated, with mouse to match pattern on other images.
Similar like in photoshop when you have several layers with opacity set to let’s say 75%.

Unfortunately we are using 17.5, and in help opacity yield result only on AnnBrush class.

We were wondering could there be some approach to introduce Alpha channel (per pixel opacity) in bitmap with all pixels opacity set to 75%.
And convert this bitmap to RasterImages that can be displayed as Annotation object (floating object that can be moved) that is translucent.

You can find a v17.5 C# .NET sample project for implementing an AnnAlphaImage object, which allows alpha blending of image annotations here:
http://support.leadtools.com/SupportPortal/CS/forums/39942/ShowPost.aspx

Thanks,
Maen Badwan
LEADTOOLS Technical Support

thanks a lot
that was exactly what I was looking for