I have been asked to take three or four exposures of the same scene having the camera in auto mode, without changing the frame. I then must bring up the histogram on each photo to compare. I have used the image below to help me understand how the histogram works. Please find attached the link to where I got this information below.
The following shots are hand held with the flash on, indoors.
These photos have been taken seconds apart and there are slight differences within the histograms. The third histogram has slightly more highlights compared to the other two which are almost identical. The flash has given a brighter appearance to all three of these photos, and as these photos are hand held I feel that the third photo is even brighter because my hand may have moved, making the flash reflect back against the glass pot.
The following shots are hand held without the flash, indoors.
As we can see with the histograms in this set of photos is that without the flash the histogram is more in the midtones section. The natural lighting has created a perfect balance between shadows and highlights. Although each histogram is different they all seem to have a more balanced range.
The following are shots with a tripod and flash taken indoors.
This set is much like the first set of photos. The flash has again made each photo brighter and of course the histogram corresponds. I feel that using the tripod eliminated the worry of a shaky hand that would then cause the histogram to be very different.
The following shots are taken with a tripod, no flash and are indoors.
Using the tripod gave me the assumption that each histogram is this set would be identical seeing as all the photos are literally seconds apart, but in this case the total range has gotten bigger as the photos went on. So even using the tripod, no flash and natural daylight each histogram is different. Maybe the daylight got brighter, maybe the camera processed the photo slightly differently or the daylight got darker. Regardless of what it was exactly no histogram is the same and the conditions in which you shoot are more important the you realise.
I found this task interesting as I didn’t think about how light and shadow can really effect a photo and that there would be a graph that represents it. I found it difficult to work out how to get the histogram, date and time stamp and the photo all together. I am worried that its hard to read. My only other way of doing this was to take photos on my phone of the LCD screen showing the histograms but it didn’t give me the image data that was required, therefore wouldn’t have worked.