Screenshot Compression

I’m trying to take a series of screenshots from Unreal. I read on this forum (…l-image-output) That you get the best results using the console command “shot” in game. This seems to be true. I need to save out a series of screenshots with specific names. Ideally I would like to save these to a specified directory as well. The trouble is, when I do, the images get over compressed and look nasty. Here’s a shot I took using “shot”:
And here’s the same shot I took using “shot filename=‘d:/screenshots/shot_2.png’”:
Why does the second image look so much worse? Is there anything I can do to preserve the quality while saving to a specific directory with a specific name?

Thanks in advance.