its literally is a 'screenshot' of the 320x240 screen. what image size do you expect? a bigger image wont give you more data etc.
My primary goal was to share the images on a blog article where I compare smartphone-based signal generators. I am writing a blog post comparing a few Android apps, their capabilities and, of course, their waveforms.
On a second article, I am teaching how to use an OpAmp (LM324) to amplify the signal from the smartphone app and bring it to a 0-5V range, keeping the same waveform, but making it usable on an Arduino, for example.
I both cases, images from the oscilloscope adds value to the article.
Thanks anyway. I hoped there could be a hack or configuration I might have missed that would allow me to have a better image.