Changes

*'''Daguerreotype''' - first practical and commercial photographic process, introduced by Louis Daguerre in 1839. The sensitive material comprised silver iodide, deposited on a polished silver plated copper base. A positive image was produced by camera exposure and mercury "development", which turned light struck halides gray-white. The image was made permanent by immersing the plate in a solution of sodium chloride.

*'''Daylight enlarger''' - early type of enlarger using light from a hole in a window to provide illumination of the negative.

*'''Desensitizing''' - reducing an exposed emulsion's sensitivity to light. This can be done by the application of dyes or by using oxidation agents

*'''Development''' - process of converting exposed silver halides to a visible image.

*'''Diazo''' - abbreviation of diazonium compounds, which decompose under the action of intense blue or ultraviolet radiation, forming an image in an azo dye.

*'''Dry down''' - refers to the amount a print darkens after drying.

*'''Dry mounting''' - method of attaching prints to mounting surfaces by heating shellac tissue between the mount and the print.

*'''Dye-image monochrome films''' - black & white negative films designed for color processing.

*'''Dye transfer print''' - method of producing color prints via three color separation negatives. Negatives are used to make positive matrixes, which are dyed in subtractive primaries and printed in register.

*'''Dynamism''' - picture structuring which relates to a sense of movement and action.