PPI - pixel per inch
72 PPI -the general convention used for uploading images that are viewable on screens eg. on websites
300 PPI -general convention that is suitable for printing images
White balance - The process of removing unrealistic colour casts, so that objects which appear white in person are rendered white in your photo. Proper camera white balance has to take into account the "colour temperature" of a light source, which refers to the relative warmth or coolness of white light.
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