Transparencies & Color Theory
Transparency is the state of being see-through; computer images of a few different formats can achieve transparency by allowing light to pass through them. Computer images are created using the light spectrum of colors, specifically what's known as the RGB color model.
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Color Theory
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Color theory is essentially the theory behind creating harmonious or dissonant color combinations from a hierarchy of primary and secondary colors.
RYB Color Model
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Historically used in painting and all hand-drawn art, the RYB color model considers of red, yellow and blue as primary colors. Red and blue combined create purple; red and yellow create orange; and blue and yellow create green.
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RGB Color Model
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The RGB color model stems from the colors of the light spectrum. The three primary colors are red, green and blue; combined, red and blue create shades of purple, red and green create shades of yellow, and blue and green create shades of cyan. All three primary colors combined create white; a lack of all three creates black.
Levels of Transparency
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Transparency has different levels. Sometimes, a single color can be rendered transparent (such as in the GIF file format, which only allows such transparency). Sometimes images can be only partially transparent, achieving a translucent effect.
Layers
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Computer images can be made transparent by graphics editors such as Photoshop by splitting the image into layers (one layer consisting of a background color, one layer of foreground text, etc.) and setting one layer as an all-transparent "alpha channel."
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