It get's banded because Android automatically decodes images based on your screen, and not based on the actual image. Why decode a 2048x2048 image when it's showing on a 800x480 screen. This I assume is to save cpu cycles and speed up image decoding where it normally will not have a issue.
When you are doing compositing though it does make a difference, and you need to be specific as to how you want the image decoded. Like I said before, you need to manually define your options to ensure it uses ARGB_8888 when decoding the image, disable dithering and scaling. Do this and you will no longer have banding. Adam On Nov 2, 1:01 am, Hatch <tomislav.hecimo...@gmail.com> wrote: > Yes, Thank you for your replies. > > I have read the article but it doesn't explain why alpha enabled > resource get's banded :( > > Is there a way to know exactly which RGB is used in the png ? > > BTW the dither option didn't work in the XML nor in the code. > > On Oct 30, 2:04 am, Lance Nanek <lna...@gmail.com> wrote: > > > I saw an interesting article on avoiding this the other > > day:http://android.nakatome.net/2010/04/bitmap-basics.html > > > On Oct 29, 7:01 pm,Hatch<tomislav.hecimo...@gmail.com> wrote: > > > > Seems my original post ("ugly pngs...") somehow disappeared :( > > > nvm. > > > > I have a problem with a png resource that has gradient fade-out alpha. > > > > The png looks great in the emulator, but displays an artefact known as > > > "color banding" (http://en.wikipedia.org/wiki/Colour_banding) > > > > Has anyone surpassed this issue ? > > > > My designer wants to trop a shadow behind his icons, and that's where > > > the bands appear. > > > > What are my options ? > > > > Thanks > > > >Hatch > > > > BTW is there any way to see all my posts here on google groups ? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en