Hi John,
The GraphicsConfigTemplate specific the minimum requirement
to render:
/**
* This class is used to obtain a valid GraphicsConfiguration that
* can be used by Java 3D.
* A user instantiates one of these objects and then sets all
* non-default attributes as desired. The getGraphicsConfiguration
* method found in the GraphicsDevice class is then called with this
* GraphicsConfigTemplate. A valid GraphicsConfiguration is returned
* that meets or exceeds what was requested in the GraphicsConfigTemplate.
* @see GraphicsConfigTemplate
* @see GraphicsDevice
* @see GraphicsConfiguration
*/
So if you suggest 2 bit per color Java3D may return 8 bit per color
to render. However if you suggest 16 bit per color and current system
don't support, Java3D will fail to initialize the graphics.
Internally ChoosePixelFormat() (under window) or
glXChooseVisual() (under solaris) is used to select pixelformat
for OpenGL verson.
- Kelvin
---------------
Java 3D Team
Sun Microsystems Inc.
>MIME-Version: 1.0
>Content-Transfer-Encoding: 7bit
>Date: Fri, 11 Aug 2000 13:56:40 +0100
>From: John Mosley <[EMAIL PROTECTED]>
>Subject: [JAVA3D] Controlling the number of colors rendered
>Comments: To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>
>I am using offscreen rendering to create a BufferedImage which I save to
>disk as a GIF file. This works fine except for the number of colors that
>are in the image. For a GIF file this is limited to 256, so there appear to
>be 2 choices:
>
> 1) use a filter to reduce the number of colors in the BufferedImage
>that is populated by J3D
>
> 2) configure J3D to only use a limited number of colors
>
>Option 1) would seem possible but time consuming to execute, option 2)
>would therefore appear to be the favored solution.
>
>Looking at GraphicsEnvironment, GraphicsDevice and GraphicsConfiguration,
>it hints at this but I can't figure out how to get a GraphicsDevice
>configured for a offscreen image? In fact all the examples I have seen use
>GraphicsEnvironment.getDefaultScreenDevice() to get the GraphicsDevice,
>even when using offscreen rendering. As GraphicsConfigTemplate3D only sets
>the minimum requirements, that doesn't seem to help in this case.
>
>So the question is can J3D be configured to use a limited number of colors
>(say 2 bits per color), alternatively have anyone any experience in
>reducing the number of colors in a existing BufferedImage?
>
>Thanks
> - John
>
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