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looking at your images at 50% will give you a approximation of what size at a maximum size you can print your image. A good rule of thumb would be, take your images dimensions and divide by 180 (ppi) and that will give you a realistic size you can print with out enlarging the image. Enlarging the file by as much as 400% can still give reasonable results though a softer image, viewed at a reasonable distance will be fine up close may fall apart somewhat.
B&W or just adding some noise to a enlarged color photo can definitely help...Show more →
50% works best if the image is about 200ppi or lower. At 300 ppi or 400 ppi 25% works best. So you have to figure out what ppi the image is going to be printed at, and then check accordingly.