| English | Spanish |
| red/black tree | árbol rojo-negro (A binary search tree which uses a one-bit flag on each node to identify the node by color: either red or black. A set of constraints on node color helps form an approximately balanced binary tree) |
| Red Book audio | audio Red Book (A standard compact disc format developed by Philips and Sony) |
| Red Book audio format | formato de audio Red Book (A standard compact disc format developed by Philips and Sony) |
| red eye | ojos rojos (A photographic condition where the eyes of the subject appear red, due to the reflection of the camera flash from their eyes) |
| Red filter | filtro rojo (A filter that is used in B&W photography. Increases contrast more than any other filter) |
| red gain | ganancia de rojo (The factor by which the red pixel value has to be multiplied to achieve R=G=B values) |
| red, green, blue, alpha | rojo, verde, azul, alfa (A model that augments the red, green, blue (RGB) method of combining colors in light-based media, with a fourth color component, alpha, which is used to control color blending. In Open GL, an alpha value of 1.0 corresponds to complete opacity and a value of 0.0 corresponds to complete transparency) |
| red-green-blue | rojo-verde-azul (A color model that describes color information in terms of the red (R), green (G), and blue (B) intensities that make up the color) |
