Your image is probably convert to 565 and the back to 24bits. This thread discusses a related problem:
http://groups.google.com/group/android-developers/browse_thread/thread/e7ce1bec8f97a78b 2011/5/13 delta42 <[email protected]> > I need to load in a 24-bit PNG mask image into my Android, and it > being a mask, I need it to come in exactly as it is on disk, with no > resizing or pixel values changed. > > When I load it from resources using the BitmapFactory, its pixel > values are slightly changed, as if it had been resized *twice*: its > dimensions are the same as original, but values that were pure grey, > like (100,100,100) are now slightly off, as in (100,99,100), for > example, or (50,50,50) becomes (49,52,49), to take another example. > > To ensure no resizing takes place I followed these steps: > > #1. I have > <uses-sdk android:minSdkVersion="8" /> > on my manifest. > > I even added > <supports-screens android:anyDensity="true"/> > although in theory this is not needed since minSdkVersion is high. > > #2. My source image is in the res/drawable-nodpi folder > > #3. I load the image with inScaled false, as in > > BitmapFactory.Options options = new BitmapFactory.Options(); > options.inScaled = false; > _bmMask = BitmapFactory.decodeResource(getResources(), > R.drawable.mask, options); > > It is my understanding that either #2 or #3 alone should ensure no > resizing takes place. > > Or course, one could claim no resizing takes place, since my image > that is 360x300 comes in at that exact dimension. However, how do I > explain that my image seems to have been somehow compressed/ > decompressed? > > I've already spent 3 hours scouring the internet for a solution to no > avail. > I have the latest Android SDK and Eclipse plug-in. > > Regards, > /d42 > > -- > 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 > -- 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
