I want to make a banner which is having size od 27*10 so what will be the size in photoshop?
If your are printing the flex or banner. Never calculate that in measurement in foot. If u mention the measurement in foot that is 27 feet x 12 feet the empty file will be in 9.7 GB what you will work in such a heavy file.
Apply this formula to make a banner is make it in inches 1 foot = 12 inch That is 27/12 = 2.25 inch and 12/12 = 1 inch
300 pixels/inch is usual for magazines, but this leads to a colossal need of storage if the image is this big. Ask the right resolution from the printhouse.