Anyone ever use a photo booth?

I loaded up a bunch of digital photos yesterday to take to the photo machine at the local grocery store. I put 153 photos onto my new flash drive and inserted it into the machine. The machine said that most of them wouldn't turn out, so I printed out the "good" ones. I was very disappointed with the quality. My very good pictures came out fuzzy and the wrong colors! There was an "edit picture" screen, but I decided that since I did that at home it wouldn't be necessary.
My questions are:
Does it make any difference what size the pictures are?
Would a larger picture be more clear?
Is there any way to make sure the colors are right before printing? The thumbnails displayed looked OK.
Anyone have any tips?

Photo booths, and photo labs in general, are only as good as the person maintaining them. Two systems are used to make prints at photo booths and print stations. The older method is to make prints with photo paper and chemicals. The new method is similar to a computer printer. There are two types of printers, inkjet and dye sublimation. Inkjet printers are the poorest of all and are rarely used in commercial settings. Dye sublimation printers do a good job, but the pictures will fade after three to five years. Dye sub printers use a four step process. Each color (Cyan, Magenta, and Yellow) is put down in a separate process using heat. The paper moves past the print mechanism, is retracted, and another pass is made. The final pass puts down a clear overlay to protect the color layers. If the printer isn't well maintained, or is well worn, the colors won't quite line up. The print will be blurry if the mechanism that heats the dye is too hot or too cold. The best method (in my opinion) is the old fashioned method. The prints last for decades and the machines are very consistent when properly maintained. On the down side, the chemicals in use have to be checked and either replaced or filtered and "replenished" on a regular basis. The developer, fixer, and stop bath can only be replenished a few times before the entire batch has to be replaced. They can be replenished well beyond the manufacturers recommendations, but the quality of the prints will really suffer. The tanks that hold the chemicals also have to be thoroughly cleaned. A sludge builds up in the bottom that throws the Ph balance of the chemicals off and, again, the print quality will suffer. When a print is made, the image is projected on the paper. If the adjustments to that projector are poorly done, the print will be fuzzy at best. Dust and oils from the air that settle on the projector lens will lead to spots and smudges. Few of the big box stores and drug stores want to pay the price to keep these machines in top shape. They cut corners on chemicals and cleaning. If you find one that does a good job, stick with it and make sure the store manager knows you appreciate the quality of service. Some of the photo lab managers understand that better pictures lead to referrals and more customers. Other managers were selling shoes last Tuesday and haven't quite figured out the basics of customer care.

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