Histogram

Low Key Original 

Low Key Original Histogram - This means 
that the pixels on the scale are closer to the "0"
mark but very few as that close to the darkest
black, the camera allows for more light to come
in making the picture more grey. Furthermore, 
this explains why there isn't any darkest black 
present. 

Low Key Edit

Low Key Edit Histogram - After making changes 
on photoshop we have changed the pixels from the 
previous image to show more black and allow less
light to come in, making the photo darker. This 
histogram shows there are many blackest black 
pixels at the point "0" located on the far 
left side. 

High Key Original

High Key Original Histogram - This
shows how the photo doesn't have any
completely white pixels, the camera
doesn't let in all the white pixels because
it doesn't want to picture to be blinded by
white. The graph shows that there aren't any
pixels at the "255" point. 

High Key Edit Histogram - After changing the
image to show more white on photoshop, we
see the white has become more clear and brighter.
This shows in the graph by the fact that the pixels
are very close to and on the "255" point on the far
right side. This allows us to see the whitest white.

High Key Edit