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Lighting takes center stage in fashion photography and a photography light meter will assist you in planning the lighting for a shot. Ideally, the light should enhance the elements of the design and the shot. It can be kept minimal to create silhouettes or mood, or bright to increase the contrast. Some pictures may require a fill light added when shooting into the sun, while others prefer the effect without. An outdoor shoot during an overcast day assists in creating a mood and allows the shadows to play across her skin which adds interest to the shot. Food preservation involves treating and handling food with the idea to greatly slow or stop spoilage that caused or accelerated by micro-organisms. Preservation normally involves preventing the development of fungi, bacteria along with other micro-organisms, along with the oxidation of fats which the cause rancidity. However, many ways of preservation actually use benign fungi, yeasts or bacteria to preserve food and add specific qualities, by way of example wines or cheeses. It may also include processes which inhibit aging and discoloration that occur during cooking, much like the enzymatic browning (oxidation) in apples when they are cut. Some food has to be sealed after treatment to avoid recontamination with microbes while others, including drying, mean food can be stored without special containment. There are many methods of preserving food including freezing, freeze drying, spray drying, food irradiation, sugar crystallization, adding preservatives, preserving in syrup, canning an d vacuum-packing.