Although cameras with manual white balance measurement systems can provide almost cast-free colour photographs, there are times when additional colour reference tools should also be used to ensure you achieve a correct colour balance in any shooting situation. Including a colour balance reference target in shots is particularly handy if you shoot JPEGs. It's less important for raw file shooters because colour tweaking is possible when converting raw files to editable formats. However, having a target in a reference shot can make the task quicker and easier when you're editing image files.
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