Hello All, I am really weak in the area of osg::Images. I have looked at the code quite a bit, but it is still confusing to me. I imagine that osg::Image is wrapping up some underlying bitmap or OpenGL image functionality. Is there some reference someone could point me to that could educate me on the subject?
What I am trying to do is create a new image that has the color values from one image and give it the alpha value from another image, I figured the best way to do that was create a new bgra (rgba?) image to hold the new value. So specifically, I am wondering about: a) How to access the pixel values of grey-scale and indexed images if my source images are such b) What is the r(), depth value for? Is it the number of bits per pixel? e.g. Should the r value for a bgra image be 4? I was thinking that, but if it were that simple, why would it be a parameter at all, since allocateImage could determine that from the GL_BGRA part. is this correct?: osg::ref_ptr<osg::Image> newImage = new osg::Image(); newImage->allocateImage(s, t, 4, GL_BGRA, GL_UNSIGNED_BYTE); c) What is the packing for (the sixth [default] parameter)? Should I allocate my new image with packing or is that going to make it harder to work with? d) Am I just going about this all the wrong way? Perhaps it would be better to reformat the image somehow to give it an alpha channel if it is not already there? Thank you so much for the great community -- Rick
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