Identificação de cores e cromática

501-36-58 Paint - General Information 501-36-58 DESCRIPTION AND OPERATION Color Identification and Chromatics Basic color theory In order to achieve optically perfect painting results it is vital to understand the physical principles of the origin of color impression. Color Color itself is a sensory perception. This perception arises through the combined effect of the following components: ‡ Light (sunlight or artificial light irradiates the object). ‡ Surface of the object (reflection from the object of certain constituent parts of the light). ‡ Eye (perception of the reflections from the object). TO BE UPDATED LATER Because the sensory impression of color is produced by all three of these components, it is dependent on the type, quality and function of the individual components. Practical examples make this clear: ‡ If a particular article is subjected to artificial light, then it gives a different impression of color to that which it gives in sunlight. ‡ An object with uniform color but different surface textures appears to have different colors (grained or ungrained dashboard). ‡ A person with perception disorder (colorblindness) cannot recognize certain colors or distinguish between them e.g. red-green weakness). In turn the type of color is determined by the light absorption ability of an object. Light shines with all color components (spectral colors) onto an object, certain components of the light are absorbed (taken in) and other components are reflected (sent on). The components which are reflected produce the specific color impression. TO BE UPDATED LATER The colors as we see them are the result of a combination of reflected colors from the spectrum. Physically speaking, these are electromagnetic waves with different wavelengths (and frequencies). The healthy human eye can recognize wavelengths between 0.36 µm (violet) and 0.78 µm (red). If all the perceptible wavelengths of the spectrum impinge on the human eye at the same time, the impression of white light is produced. Additive and subtractive color mixing TO BE UPDATED LATER Additive color mixing is the combination of light from different sources to give white. Different intensities of the additive primary colors red, green and blue allow millions of different colors to be represented (RGB colors). Additive color mixing is always therefore used when light should enter the eye directly (without reflection off an object). Such as in the case of computer monitors or overhead beamers.