| Term | Definition |
|---|---|
| Igneous | Igneous – Rocks which have solidified from a molten state. |
| Igneous | Igneous – Rocks which have solidified from a molten state. |
| Ilfochrome | Ilfochrome – A trademarked photographic paper and the process of making prints with such paper. Ilfochrome prints are produced from slides or transparencies, not color negatives. |
| Illuminance | Illuminance – The density of luminous flux incident of a surface in lumens per unit area. |
| Impact Noise | Impact Noise – Sound resulting from direct contact of an object with a sound barrier, can occur on any surface, but it generally occurs on a floor and ceiling assembly. |
| Impasto | Impasto – A thick, uneven surface texture achieved by applying paint with a brush or palette knife. |
| Incalmo | Incalmo – The glassblowing technique used to create horizontal or vertical bands of color by forming and connecting cylinders or colored glass. |
| Inclusions | Inclusions – Particles of metal, bubbles, etc., that occurs within glass or is added for decorative effect. |
| Inglenook | Inglenook – A recess for a bench seat or two next to a fireplace. Popular in Shingle style and Craftsman homes. |
| Inlay | Inlay – A decorating technique in which an object is incised with a design, a colorant is pressed into the incisions, and the surface is then scraped to confine the colored inlay to the incisions. |
| Intaglio | Intaglio – A printmaking process in which an image is created from ink held in the incised or bitten areas of a metal plate, below the surface plane. Engraving, etching, mezzotint, and aquatint are examples of the intaglio process. |
| Intrusive | Intrusive – Igneous rock formed by the cooling of magma inside the earth’s crust. |
| Ionic | Ionic – Of the architectural orders, the Ionic column is recognized by its scrolling capital. |
| Iridized Glass | Iridized Glass – Flat or blown glass sprayed with a vapor deposit of metal oxides for an iridescent finish. The iridized layer, which resembles an oil slick, can be selectively removed for a two-tone effect. |
| Iris Print | Iris Print – The trademarked name for a digital print produced by an Iris Graphics inkjet printer. |