<< LINK REMOVED >> That's actually incorrect. As mentioned in the article, pulling the screenshots directly from the PS4's hard drive onto a USB stick produced a file with the same compression as one uploaded to Twitter.
<< LINK REMOVED >> Hey, I tried this but it didn't seem to work. Holding down the share button took the screenshot, then holding triangle didn't seem to do anything. Looking at the screenshot in the capture gallery, it was still compressed to 190kb. Is there something I'm doing wrong?