Resolution and units

Pixstat can work with the number of pixels or with any of the following units: µm, mm, cm, m or inches. If units are used, then the resolution of the picture (in pixels per unit of length) has to be indicated via the Option menu. The resolution can be different in horizontal and in vertical direction, but klicking on the equal button forces them to be the same. It is also possible to let the resolution being variable by checking the option use resolution from picture file or scanner if available. If the resolution indicated on the main window differs from the resolution set via the Option menu, then it must be because this option has been checked. Beware that the resolution saved with a picture file is not always correct, depending on the software which they were edited. The information about the resolution may especially get lost if picture files are saved in GIF format, in which case the (not meaningful) resolution of the screen would be used instead of the true original resolution. If in doubt, measure the length of an object with a ruler and compare with its length as given by Pixstat.