I've been looking at colorimeters, and it seems that all the budget level ones (below or around 100, ie spyder2) measure by sticking itself onto a TV screen to measure with its measuring side facing the side that its sticking up against.
However, what happens if you want to calibrate a projector? You obvious can't stick it up against the screen, cause the sensor won't be able to pick up any signals... so how?
also, can you please recommend some cheap ones ($100-) or other ways to calibrate without spending money to be a colorimeter.
thank you.
However, what happens if you want to calibrate a projector? You obvious can't stick it up against the screen, cause the sensor won't be able to pick up any signals... so how?

also, can you please recommend some cheap ones ($100-) or other ways to calibrate without spending money to be a colorimeter.
thank you.