Hi resolution graphics

I'm quite new with Photoshop.I just want to know how do these people make those hi resolution images ? For example the image file is 800 X 600 and the file size about 182 Kb.Do they do touch ups or just originally scanned with a hi dpi scanner ?
yeah, well the only way to reduce the size of the file but keep as much of the integrity of the picture as possible is making a .jpeg image lower quality (done after doing save as .jpg - a window comes up)
I try to stay away from using any other file format than .jpg and .png because of the limitations most other formats have (like .gif is only good for animations imo)

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Perris Calderon wrote on Electronic Punk's profile.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS

Been running around Quora lately, luv it there https://tinyurl.com/ycpxl
Electronic Punk wrote on Perris Calderon's profile.
All good still mate?
Hello, is there anybody in there? Just nod if you can hear me ...
What a long strange trip it's been. =)

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