This might help: http://stuffthathappens.com/blog/2010/06/04/android-color-banding/
YuviDroid On Thu, Nov 4, 2010 at 9:33 AM, Hatch <[email protected]> wrote: > Great > > Your reply gives me hope :) > > But can you provide me with more information on how to do it ? > > I have a gradient alpha png. > I just use it in imageView inside an XML resource. > I don't set the dither option (although have tried both true and false > options with same result) > And I get the bands. > > Do I need to draw the image by hand, and which API must I use in that > case ? > > Regards, > > Hatch > > > On Nov 4, 1:19 am, Adam Hammer <[email protected]> wrote: > > 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<[email protected]> 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 <[email protected]> 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<[email protected]> 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 [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- YuviDroid Check out Launch-X <http://android.yuvalsharon.net/launchx.php> (a widget to quickly access your favorite apps and contacts!) http://android.yuvalsharon.net -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
