1) for B&W photo printing, the more colors you use the better the result
Some design would required 1 screens, some 3 screens and more.
Here are exemple of separated file :
http://www.wilflexeasyart.com/downloads/BMW.zip
http://www.wilflexeasyart.com/downloads/Watch.zip
You will need trials an error to fine tune your techniques, learn to control dot gain, introducing more color for tonal range control...
If you are 100% new to screenprinting, you can read as well mitch different separation book
Book
2) This is sublimation process, you need wide format printer, and huge heat press.
https://www.youtube.com/watch?v=7u9LG_bqeTE
Some design would required 1 screens, some 3 screens and more.
Here are exemple of separated file :
http://www.wilflexeasyart.com/downloads/BMW.zip
http://www.wilflexeasyart.com/downloads/Watch.zip
You will need trials an error to fine tune your techniques, learn to control dot gain, introducing more color for tonal range control...
If you are 100% new to screenprinting, you can read as well mitch different separation book
Book
2) This is sublimation process, you need wide format printer, and huge heat press.
https://www.youtube.com/watch?v=7u9LG_bqeTE