Colour temperature / white balance
Original photograph
Edited photograph
The White balance, original photograph shows an orange and warmer hue to the overall image. the photograph setting at the time was set to Direct sunlight, The photograph should not have this orange hue to it, using the Kelvin scale for reference, The edited photograph is more true to reality.
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Average day light is about 5500 Kelvin, which has a light blue hue. In contrast to this, The Direct sunlight setting on the camera is about 3000-4000 Kelvin which gives the image an yellowish orange hue which is unrealistic to the situation at the time.
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It is very important to understand and know the difference the White balance has on any photographic image. I will use the Original photograph and edited photograph to explain.
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The original photograph creates a misleading impression on the subject-matter, it may appear to the viewer that I photographed in a very hot location and It was shining very brightly, However after editing it is clear to see that it was in fact false. The real subject-matter was photographed on an overcast day, which had some sunlight piercing through the clouds
Using Lightroom, there is the opportunity to freely change the white balance with the 'White Balance corrector' which is located underneath the histogram graph. Using the settings on my camera I had photographed the same location cycling through the settings of white balance on the camera, it is easy to rely on Adobe softwares this can hinder potential adaptation skills in photography because its recommended to fix any white balance issues whilst photographing it is more efficient.
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The [Example 1.a] visually has a cool temperature, not being true to the actual scene and environment, using screenshots to show difference between the images before and after balance editing. The difference in the settings used when photographing the long corridor the settings [Auto] [Incandescent] [Fluorescent] [ Direct sunlight] [Flash] [Cloudy] [Shade] [Pre present manual] using the Direct sunlight setting Indoors causes the hue of the image to turn blue, this would normally be used when photographing something with a Kelvin 5500 [Estimated] The example on the right has a more orange hue, the tint is effected with a warmer setting which changes the corridor in another way, the idea is to get a balance and the white balance tool can change regardless of the photographic setting. [seen in both examples 1.a and 1.b both have the same photographic result even though they were drastically different when originally imported to lightroom.
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Some more visual differences between the settings
the importance that Is often forgotten is the addition of the gray card, (white balance card) this is an important piece of equipment which is created in a factory using chemicals in order to give a photographer a base colour to use when using digital editing software, because it will act as the colour reference point it is correcting based in the card. The photographs which include a gray card are used so that it will be a balanced colour RGB, for example if I had a red fire extinguisher and used that red for the base colour with the white balance tool the average of R will be higher than G and B causing the image to become a warmer shade of colour hue which isn't what the real image is of. using something that is bright blue as a base colour will cause the photograph to have a blue saturation hue which again is the unbalanced. The idea is to get a balanced RGB and doing so will automatically adjust the hue saturation to a colour temperature that is accurate to what we are seeing when photographing
ISO practice
For the Iso practical I progressively increased my ISO setting on my camera whilst photographing the the same subject matter from a tri-pod because I didn't want any camera shake and movement effecting the results. from low to high, this was in order to visually document how the ISO setting changes the photograph atmosphere it is important to note that I kept the same aperture. in this Practice i understood that the higher the iso setting the more higher the exposure will be, causing in certain instances the sky to appear clear white. this could cause more grain and noise in the photograph. The lower the ISO the less exposure there will be in the photograph, examples below show different varieties of ISO with each getting one stop higher than the last starting with 100 ISO on the left box and ending on 12,800 ISO on my Nikon 3300.
