How to make sure images captured by FFMPEG from USB is lossless?

I'm to capturing 10 images from camera. Like so: ffmpeg -hide_banner -loglevel error -f video4linux2 -i /dev/video0 -vframes 10 -video_size 640x480 test%3d.jpg Since JPG is lossly , at I need to change the image format. Let's say tiff. Like so: ffmpeg -hide_banner -loglevel error -f video4linux2 -i /dev/video0 -vframes 10 -video_size 640x480 test%3d.tiff Does this ensure, image files are lossless as we got from camera? Or since It's using -vframes 10 it works like a 10 frame video, and ffmpeg uses some video compression at each frame (making some information loss)? /I'm sorry if this is a stupid question/