I also noticed that when I call BitmapFactory.decodeFileDescriptor (fileDescriptor) to get the Bitmap back from the file, the bitmap returned to me is null. Any clue what I could be doing wrong (assuming the PNG was written correctly to the file when I did bitmap.compress ())?
Rohit On Jun 12, 6:12 pm, Rohit <[email protected]> wrote: > bitmap.compress() returns false to me and doesnt write to the file > when I use the PNG format. For me PNG doesnt work. Is it possible that > this (nativeCompress) fails because I have a large bitmap that I > passed to it? > > On Jun 12, 2:03 pm, Romain Guy <[email protected]> wrote: > > > PNG encoding definitely is supported. That is for instance how the > > wallpaper chosen by the user is stored. > > > On Fri, Jun 12, 2009 at 1:57 PM, Rohit<[email protected]> wrote: > > > > Hi, > > > I have a case where I need to retrieve the bitmap from an ImageView > > > and write that bitmap to a file so that I can later on retrieve it > > > back again and set it on a new ImageView. I do this using > > > bitmap.compress() method. However, the problem is that after I do this > > > about 5 times, the quality of the Bitmap degenerates badly. The format > > > I use for the bitmap.compress() is JPEG with the quality as 100. In my > > > mind 100 would mean no compression of the source bitmap and that the > > > bitmap should be lossless, but it doesnt seem to be that way. Is this > > > a bug or is this how it is meant to be? > > > > I want a lossless compression and I tried to use PNG as the format > > > with bitmap.compress() but that doesnt seem to work either. After > > > digging around I found out that PNG encoding is not supported, which > > > basically leads me to believe there is no way of storing (in a > > > lossless way) a bitmap - isnt that weird? > > > > > > http://developer.android.com/guide/appendix/media-formats.html > > > > How else can I achieve this lossless writing of bitmap to the file. > > > Why doesn the Bitmap class simply have an encode() method to write the > > > bitmap in memory as is? > > > -- > > 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 -~----------~----~----~----~------~----~------~--~---
