The main purpose of this question is to know what is the best option to choose between PNG and JPG for android development considering the following scenarios
1) is it a
It's just a question of quality and details. Just for my opinion, for a big background resolution is better to use a JPG, if you don't need any transparency on the image, with the right compromise between quality and size of file,
PNG format is a lossless compression file format, which makes it a common choice for use on the Web. PNG is a good choice for storing line drawings, text, and iconic graphics at a small file size.
JPG format is a lossy compressed file format. This makes it useful for storing photographs at a smaller size than a BMP. JPG is a common choice for use on the Web because it is compressed. For storing line drawings, text, and iconic graphics at a smaller file size, GIF or PNG are better choices because they are lossless.
From:http://www.labnol.org/software/tutorials/jpeg-vs-png-image-quality-or-bandwidth/5385/