ps how the input data when cutting and cutting of different sizes like you?

I would like the Conference could only manually drag map is 5cm * 4cm I set is 10cm * 8cm results also cut out smaller than the Original

units of reasons, usually with px.Size but also with the relevant resolutions, size as the actual size of the high resolution of your little bigger

from a 5X4 cut to 10X8, the use of zoom it, cut will cut some pixels can not be enlarged, the size of the image inside to adjust the look