[4 – 6 photos for part 1; 36 photos for part 2]
Part 1: Produce 4 – 6 photos which are deliberately lighter or darker than average and say why.
As the histogram above shows, the image of the Tees is much lighter than average. This is largely because it was taken after a lot of heavy snowfall on a bright sunny day. The River Tees was completely iced over so there it’s an extremely bright scene with blown out highlights.
The image above shows the white hull of the cruise ship Ventura against a cloudy sky. The only bit of colour is on the flag and there is some shadow above one of the decks. Therefore this images creates a histogram where the pixels are packed towards the right-hand highlight area.
The Dalek was over-exposed to make him look more intimidating and to make his white eye stand out against the darker background.
The above image of P & O Ventura’s atrium is very under-exposed with almost all of the histogram weighted to the left, with peaks exceeding the height of the graph. Whilst there are lights in the scene they are along way from the camera, with the only natural light coming from the windows in the background. I had pointed the camera down towards the orange/ brown carpet and so there was very little light reflecting back into the lens.
Part 2: Take 5 or 6 different photos of any subject and make 5 exposures of each.
At – 2 EV the histogram is weighted heavily to the left hand side with almost no highlights. Shadowed areas contain very little detail and white areas appear as grey in colour.
At -1 EV there is a gap between the left-hand-side of the histogram and where the graph begins. The shadow peaks are much higher than the highlights, with the histogram tapering off towards the right. There is a particular difference under the table where it is not as dark compared to – 2 EV.
The original image is well exposed with pixels across the histogram. The middle is leveled off and either side has a long spike. There is detail in the highlights and the shadows, with the house being white and shadow detail in the wooden chairs.
At + 1 EV the scene becomes much lighter, with some of the yellow wall fading in the background. Shadows have also lightened, the house windows don’t look as dark. This is represented in the histogram with a gap on the left-hand side and a weighting towards the highlights.
The highlights have become blown out and there is very little shadow. The blackboard is more grey than black and detail has been lost on the picture hanging to the left of the dolls house. This is shown on the histogram with peaks on the right-hand side.
The above image shows the histograms from all 5 photographs. The histogram clearly moves from the under-exposed area on the left to being over-exposed on the right hand-side of the histogram. The well-exposed image in the centre has almost a balanced coverage right across the histogram.
Here are other images that I have taken, altering the exposure to show the range from being over-exposed to under- exposed.
The over-exposed image (EV +2) shows very little detail in the brick path and white wall. The well-exposed photograph shows detail in the shadows on the door and the texture of the white wall. The under-exposed image has made the brick path more pronounced, but it is difficult to work out the colour of the door.