Well I know the initial reaction is to laugh, but keep in mind that a billboard will most often be viewed from a long distance, essentially causing a "retina" effect, i.e you're too far away to spot pixellation. 127kb is probably low for most photos, but the point is that you don't need full fidelity for a billboard. Up close it can be horribly pixellated and even blurry, but from the minimum viewing distance look absolutely fine.
Initial reaction: LOL, no, you silly person.
Second reaction: Well, actually, it depends. I bet there is a case where a 127 KB image would be more than enough, or even ideal. What if it’s a solid colour? What if it’s supposed to be a grid of pure black and white retro art pixels? What if it’s a low-contrast gradient?
This is already one step better than the typical client, who would just send out that 127k file without a second thought…
Then send the image again, scaled up in a Word doc when you ask if they have a higher res...
I thought I'd just link to this question on stack exchange because it made me smile as I've had similar questions when working with clients. But in truth, clients who aren't dealing with design regularly shouldn't NEED to know these details—that's what they hire us for.
Post your favorite questions you've received below.
Yes! Absolutely, and I hope I would never belittle someone I’m working with for that very reason. If they knew it all, they wouldn't need me.