Thanks for the reply Alex.  I tried those changes (I think I've tried just 
about every pixel/internal format that I could think of) and the behavior of my 
program hasn't changed unfortunately.  


apecoraro wrote:
> I think the internal format of your osg::Image should be set to GL_RGBA8 not 
> GL_RGBA, which is a pixel format not an internal format. I find the OpenGL 
> 2.1 documentation very confusing on the use of internal format and pixel 
> format, but I think the 3.3 and 4.2 documentation is much easier to 
> understand. So check it out to verify what I'm saying.
> 
> http://www.opengl.org/sdk/docs/
> 
> Also, insetad of setting the osg::Texture2D internal format to GL_RGBA you 
> should set its internal format mode to osg::Texture::USE_IMAGE_DATA_FORMAT 
> (actually that is the default, but when you call setInternalFormat it changes 
> the mode to osg::Texture::USE_USER_DEFINED_FORMAT). So I think just removing 
> the call to setInternalFormat on the texture will suffice.
> 
> Change this:
> 
> Code:
> 
> image->setImage(width, height, 1 ,GL_RGBA,GL_RGBA,GL_UNSIGNED_BYTE, (unsigned 
> char*)data,osg::Image::NO_DELETE);
> 
> 
> 
> 
> to this:
> 
> Code:
> 
> image->setImage(width, height, 1 ,GL_RGBA8,GL_RGBA,GL_UNSIGNED_BYTE, 
> (unsigned char*)data,osg::Image::NO_DELETE);
> 
> 
> 
> 
> and this:
> 
> Code:
> 
> lutTexture->setInternalFormat(GL_RGBA);
> 
> 
> 
> 
> to this:
> 
> Code:
> 
> lutTexture->setInternalFormatMode(osg::Texture::USE_IMAGE_DATA_FORMAT);
> 
> 
> 
> 
> Alex


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