> This seems like a major framework fail... 16Bit graphics? It's 2009, > I'd sort of expect better image rendering than that of Window 3.11.
Except that phone displays do not display more than 16 bits of colors. The displays are natively 565. > > On Oct 30, 3:55 am, Ian <[email protected]> wrote: >> The pre-dithering of the images worked fine (I've had to download a >> dithering plugin to photoshop). >> >> On Oct 29, 3:52 pm, Ian Guedes Maia <[email protected]> wrote: >> >> > Thanks. I've checked it and the optimization do not affect the colors >> > the way that is shown on the emulator/device. I've tried to define a >> > proxy XML for the PNG and set its dither to true, but it didn't >> > worked. I'll try to change the png image settings on photoshop or >> > something. >> >> > I've found some previous discussion on the subject, but nothing >> > conclusive i >> > guess:http://osdir.com/ml/AndroidBeginners/2009-06/msg00017.html(I'lltry >> > that)http://groups.google.com/group/android-developers/browse_thread/threa...... >> >> > 2009/10/29 webmonkey <[email protected]>: >> >> > > To do a true comparison of what the PNG is like after 'optimization' >> > > take it out of the final APK, it is just a zip archive. >> >> > > The banding artifacts you see are because the device and the emulator >> > > are displaying in 16-bit 565 pixel format, they can't display all the >> > > colors. Have you tried painting the image with Paint.setDither(true) >> > > turned on: >> >> > >http://developer.android.com/reference/android/graphics/Paint.html#se... >> >> > > On Oct 28, 9:20 pm, Ian <[email protected]> wrote: >> > >> Hi all, >> >> > >> I've noticed that the PNGs of my application with some gradients >> > >> effects looked terribly bad at the device (a Samsung Galaxy) and at >> > >> the emulator, and I've found the following note at the documentation >> > >> (http://developer.android.com/guide/topics/graphics/2d- >> > >> graphics.html): >> >> > >> "Note: Image resources placed in res/drawable/ may be automatically >> > >> optimized with lossless image compression by the aapt tool. For >> > >> example, a true-color PNG that does not require more than 256 colors >> > >> may be converted to an 8-bit PNG with a color palette. This will >> > >> result in an image of equal quality but which requires less memory. So >> > >> be aware that the image binaries placed in this directory can change >> > >> during the build. If you plan on reading an image as a bit stream in >> > >> order to convert it to a bitmap, put your images in the res/raw/ >> > >> folder instead, where they will not be optimized." >> >> > >> I've tried the res/raw suggestion, but it didn't worked. >> >> > >> I've tried to use the image as JPEG as a workaround, but I couldn't >> > >> use 9-patch. >> >> > >> I've uploaded a comparison between the original png and the >> > >> "optimized" png that is shown on the emulator or >> > >> devices:http://www.weka.com.br/temp/img/comparison.jpg >> >> > >> One workaround would be put the images at /assets/ and manually load >> > >> and set the image on the ImageViews, but it requires a lot of code >> > >> changes. >> >> > >> Any ideas? Is there any way to disable this optimization? >> >> > >> Thanks in advance, >> > >> Ian >> >> > > -- > 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 > -- Romain Guy Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them -- 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
