Hi Robert and Stephan, I can see the problem using osgviewer. The images I use are available from: http://cvs.flightgear.org/viewvc/data/Textures/Sky/
Here I list some images that show the problems: [Black Edges instead of transparency] broken_n.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced cirrus_n.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced cl_cb.png: PNG image data, 512 x 512, 8-bit/color RGBA, non-interlaced cl_cu.png: PNG image data, 1024 x 512, 8-bit/color RGBA, non-interlaced cl_cu2.png: PNG image data, 512 x 256, 8-bit/color RGBA, non-interlaced cl_cumulus.png: PNG image data, 1024 x 1024, 8-bit/color RGBA, non-interlaced cl_ns.png: PNG image data, 1024 x 1024, 8-bit/color RGBA, non-interlaced cl_ns_white.png: PNG image data, 1024 x 1024, 8-bit/color RGBA, non-interlaced cl_stratus.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced cloud.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced few_n.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced inner_halo.png: PNG image data, 64 x 64, 8-bit/color RGBA, non-interlaced moon.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced outer_halo.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced scattered_n.png: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced sun.png: PNG image data, 128 x 128, 8-bit/color RGBA, non-interlaced [CGBitmapContextCreate got error] broken.png: PNG image data, 256 x 256, 8-bit gray+alpha, non-interlaced cirrus.png: PNG image data, 256 x 256, 8-bit gray+alpha, non-interlaced cl_cumulus2.png: PNG image data, 1024 x 1024, 8-bit gray+alpha, non-interlaced cl_st.png: PNG image data, 256 x 256, 8-bit gray+alpha, non-interlaced few.png: PNG image data, 256 x 256, 8-bit gray+alpha, non-interlaced scattered.png: PNG image data, 256 x 256, 8-bit gray+alpha, non-interlaced Stephan, I tried kCGImageAlphaFirst as you said, but it only showed the following errors on loading RGBA images (e.g. cl_cumulus.png): <Error>: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component colorspace; kCGImageAlphaFirst; 4096 bytes/row. <Error>: CGContextDrawImage: invalid context Could you make some tests with these images on your end too? Best, Tat On Nov 26, 2009, at 11:07 PM, Robert Osfield wrote: > 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 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
