Working with Open_EV part 3

Using the enhance buttons indicated in the image below, first click on the linear stretch button .

You should now have an image looking something like the one below. The arrows indicate areas of potential archaeological significance

Now click on the histogram equalise button . The features in the bottom field are now much clearer, although the linear feature in the top field has become less visible.

You can play around with the values that the non-linear equalisation has chosen by returning to the raster source dialogue (the one you used to change the band combinations). This allows you to manually use the sliders on each of the three bands to make more subtle enhancements to the image. To return to a non enhanced view of the data simply click on the revert to no enhancement button . We now want to move beyond the visible wavelengths.