HI Tat, I don't have a OSX system to test against personally, but for those who do have OSX and wish to help investigate this bug with the imageio plugin it would be worth putting together a small set of test images that you see problems so that they can reproduce the problem themselves.
Also if we can settle upon an existing OSG example or a small mod to one that can help illustrate the issue then this would also help. For instance do you see the problem if you do something as simple as: osgviewer --image myimage.png Cheers, Robert. On Thu, Nov 26, 2009 at 1:12 PM, Tatsuhiro Nishioka <tat.fgmac...@gmail.com> wrote: > Hi there, > > I have two problems in drawing PNG image using imageio on Mac OS X. > > One problem is that 16-bit grayscale textures (PNG images) cannot be loaded > due to the following errors: > > <Error>: CGBitmapContextCreate: unsupported parameter combination: 8 integer > bits/component; 16 bits/pixel; 1-component colorspace; kCGImageAlphaLast; 512 > bytes/row. > <Error>: CGContextDrawImage: invalid context > > The cause of this is that CGBitmapContextCreate doesn't accept the > combination of 1 component colorspace and 16bps. One solution I can think of > at this moment is to create a bitmap context using RGBA colorspace (as the > same as the 32bit RGBA image). This works fine on FlightGear but I'm not so > sure if this works on all 16bpp images. > > > Another problem is that imageio's libpng doesn't properly handle transparency > in PNG file. The problem I have is that the transparency in PNG files are not > at all handled and we see a lot of unexpected black or dark portions. I > strongly recommend the use of osgdb_png.so (or .dylib) for handling png > images instead of imageio. > > More detail explanation, screenshots, and an experimental patch for solving > these two problems are available from: > http://macflightgear.sourceforge.net/home/development-notes/devnote-nov-26-2009 > Please try my patch and see if it also works on many OSG applications. > > FYI, I'm using OSG/svn as of a few day back on Mac OS 10.5.8 / intel. > > Best, > > Tat > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
