Wednesday 9 October 2013

Picture Styles, White balance and RAW vs JPEG

 Picture Styles

Picture styles are already set on the camera and you can use them to change the appearance of a JPEG image. For example you can take an image in black and white straight on the camera rather than having to change it later in post processing software like Photoshop. Advantages of using picture styles are they can be uploaded quickly and you can also preview each picture style before you take the image. Disadvantages are that the camera chooses which tones to set the black and white to and this can sometimes not make the final image look as good as if it were to be edited in post processing. Also in post processing you can change the effects to exactly how you want them, however, on the camera, there are custom picture style settings but you cant change the settings on that image once the picture has been taken. Here are some of my images using different picture styles on the camera;


 This picture I took on the Monochrome picture style setting. Black and white images are not usually starkly contrasted as black and white. They combine black and white together producing a range of shades of grey. 


For this image I used the Saturated picture style and I was able to adjust how high or low I wanted the saturation to be on the camera. I set it as high as it would go so all the colours would be very vibrant, almost giving the image a cartoon effect, however it still looking realistic.


For this image I used the custom picture style setting and I was able to adjust he saturation, colour tone and contrast myself. I set it to quite a high contrast so that the light areas in the picture would be bright. As you can see the sky is a very bright blue and fades into white on he right hand side of he image.










Colour Temperature

White balance (WB) changes the colour temperature of the image, you can make the image look cold, warm or natural depending which setting you have it on. WB/colour temperature  is measured in Kelvin (K), for example daylight WB is around 5200K and tungsten (indoor light) is around 3200K. If you set the WB to lower than it should be depending what colour temperature you're in,  then the colours in the image won't come out correctly as the whites won't come out white. However, using different setting can sometimes make an image look more appealing, for example if you wanted to give an image a warm feeling for effect. Here are three of my images that show different colour temperature: 



For this image I set the white balance to 'cloudy' so that it would have a hint of blue giving it a cold effect.








 

For the next image I wanted it to look quite warm, so i set the white balance to 'tungsten', giving the image those warm yellow colours.
 
 
For the final image I wanted it to have a natural colour temperature so I used the 'daylight' white balance setting because the environment I was shooting in had a bright natural light source.






RAW vs JPEG

A RAW image is an untouched and uncompressed file. It contains all the information recorded when the image is taken and allows for changes such as picture style and white balance in later production.

A JPEG image is standard format and has a compressed file which saves space but however lacks quality. Also every time you save the file, it loses quality.

For example if you took a black and white image using JPEG you wouldn't be able to change the white balance or picture style. But if you took an image using RAW you would be able to change the white balance, picture style, exposure etc in later production.

However, RAW files are not readily viewable when uploaded onto the computer, they can only be used by certain software as they require a codac (a package that reads all the information of the file and displays the image as it is). Software such as Adobe Photoshop or Bridge are need to view and edit the RAW images. Here is my example of how you can edit a RAW image:
 
 
 
Here is the original RAW image and as you can see it is a little over exposed and has quite a cold look to it.



Using Photoshop I was able to adjust the look of the image my self. I used scales to increase or decrease effects such as white balance, exposure, contrast and saturation.

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