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Pattern is the uniform repetition of any of the elements of art or any combination thereof.

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Contrast is the difference between elements of art in a composition, such that each element is made stronger in relation to the other. When placed next to each other, contrasting elements command the viewer's attention.

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Emphasis is when the artist creates an area of the composition that is visually dominant and commands the viewer's attention

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Balance refers to the visual weight of the elements of the composition. It is a sense that the painting  feels stable and "feels right." Imbalance causes a feeling of discomfort in the viewer.

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The golden hour refers to the period just after sunrise or just before sunset, and its length depends on where you are, what time of year it is, and the weather conditions.

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Artistic similarities in terms of style or form.

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The basic film format for single lens reflex cameras.

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is a type of camera with two lenses of the same length. One of the lenses is the "taking lens", while the other is used for the viewfinder system

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Large format is larger than "medium format". Big film size.

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the photogenic process used with currently available black and white films and printing papers

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A keeper of a photo collection.

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Public display of photographs

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The action of framing a photograph.

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A room or building that displays photos.

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legal right given to print, publish, film or record

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Lines and curves are marks that span a distance between two points (or the path of a moving point).

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Shape refers to a 2-dimensional, enclosed area

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Color is the element of art that is produced when light, striking an object, is reflected back to the eye.

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The form of a work is its shape, including its volume or perceived volume

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Value is the degree of lightness and darkness in a color. The difference in values is called contrast.

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Texture, another element of art, is used to describe how something feels or looks.

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Space is any conducive area that an artist provides for a particular purpose.

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Scale refers to the size of an object (a whole) in relationship to another object (another whole)

Proportion refers to the relative size of parts of a whole (elements within an object).

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Movement is the result of using the elements of art such that they move the viewer's eye around and within the image. A sense of movement can be created by diagonal or curvy lines, either real or implied, by edges, by the illusion of space, by repetition, by energetic mark-making.

Rhythm is created by movement implied through the repetition of elements of art in a non-uniform but organized way

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Unity/Variety  You want your painting to feel unified such that all the elements fit together comfortably. Too much unity creates monotony, too much variety creates chaos.You need both.

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symmetry around a central axis

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made up of exactly similar parts facing each other or around an axis

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having parts that fail to correspond to one another in shape, size, or arrangement; lacking symmetry.

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the fact of two things being seen or placed close together with contrasting effect.

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containing or using only one color.

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existing in thought or as an idea but not having a physical or concrete existence.

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used to describe any colorthat is calm or soothing in nature. Cool colors are not overpowering and tend to recede in space.

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used to describe any colorthat is vivid or bold in nature. Warm colors are those that tend to advance in space and can be overwhelming.

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colors directly opposite each other in the color spectrum, such as red and green or blue and orange, that when combined in the right proportions, produce white light.

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The usage of different colors can give life to a painting

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The guideline proposes that an image should be imagined as divided into nine equal parts by two equally spaced horizontal lines and two equally spaced vertical lines, and that important compositional elements should be placed along these lines or their intersections.

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Some argue that the rule of thirds is an oversimplification of a more advanced mathematical equation known as the golden ratio

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Leading lines refers to a composition technique whereby the viewer's eye is attracted to lines that lead directly to the principle subject in the image.

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Objective photography is an impersonal image not influenced by feelings, interpretations or prejudice.  To create an unbiased photographic image or documentary.
Subjective photography is the creative or artistic process. The aim is to make a personal interpretation, a composition to capture and create an image with style

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Often containing helpful and specific suggestions for positive change, constructive criticism is highly focused on a particular issue or set of issues, as opposed to providing general feedback on the item or organization as a whole.

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the practice of taking someone else's work or ideas and passing them off as one's own.

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A trademark or service mark includes any word, name, symbol, device, or any combination, used or intended to be used to identify and distinguish between others

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relating to moral principles or the branch of knowledge dealing with these.

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illumination from behind.

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Diffused light that which is not harsh and direct, it has been softened in some way.

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Ambient light means the light that is already present in a scene, before any additional lighting is added.

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the treatment of light and shade in drawing and painting.

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the dark shape and outline of someone or something visible against a lighter background, especially in dim light.

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A file format is the structure of how information is stored (encoded) in a computer file. File formats are designed to store specific types of information, such as JPEG and TIFF for image or raster data

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When raw files from your camera are converted to DNG, they are converted to a universal standard through a process that Adobe has developed to best interpret the data in your CR2 (or NEF, etc.) files

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A .PSD file is a layered image file used in Adobe PhotoShop. PSD, which stands for Photoshop Document, is the default format that Photoshop uses for saving data.  PSD is a proprietary file that allows the user to work with the images’ individual layers even after the file has been saved.

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JPEG is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography.

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A TIF file is an image file saved in a high-quality graphics format. ... TIFF files can be saved in an uncompressed (lossless) format or may incorporate .JPEG (lossy) compression.

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In photography the diptych has become a popular format. Pairs of closely associated portraits, images or themed pictures are often used to off-set one another.

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1. a minute area of illumination on a display screen, one of many from which an image is composed.

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is a group of three pictures. ... The image shown above is a triptych of pictures in one image.

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The blue hour (from French l'heure bleue) is the period of twilight in the morning or evening, during the civil and nautical stages, when the Sun is at a significant depth below the horizon and residual, indirect sunlight takes on a predominantly blue shade.