b'spectrum scienceSincecolourseventuallybreakdownfromexposuretoUVResenelight,heatandotherenvironmentalfactors,ResenemasterGulf Streamcolour standards are preserved in a freezer to ensure the colour is kept consistent. Each batch of Resene colour charts, drawdown paint swatches and testpots are checked carefully against these standards to ensure colours remain consistent. Resene also keeps a mathematical spectral curve of all its standards that is a permanent record of the colour as it never changes. This is measured using a spectrophotometer, which is regularly externally calibrated.Whenitcomestocolourstandards,thereasonReseneis so fussy is that a checked colour may be either side of a colour A crash course on colour accuracy. standard. For example, one white colour may be a little redder and one may be a little yellower. While each of those colours could fall within the 0.4 threshold when compared to the original colour What isE (Delta E)? colour language and are also referred to as the CIE colour system,standard, if the two samples are compared, their E will be greater EisastandardmeasurementcreatedbytheCommissionwhich expresses colours in three dimensions (lightness, redness- as they lie on different sides of the colour standard. By keeping the InternationaledelEclairage(InternationalCommissionongreyness and yellowness-blueness). white E down to 0.4, if one colour sample happens to sit on the Illumination) that quantifies the difference between two colours.Once you have a measurement for each colour, the E can beyellower side and another on the redder side, their combined E E is measured on a scale from 0 to 100, where 0 indicates nocalculated through a mathematical formula. will still be less than 0.8which is not considered perceptible to colourdifferenceand100isacompletedistortion.Standardthe normal eye. above: The CIE colour system expresses colours in three dimensions perception ranges are: Why it matters ResenecolourchartsaremadewithReseneSpaceCote lightness, redness-greyness and yellowness-bluenessso its best1: Not perceptible by the human eye At the end of the day, if you specify a particular Resene colourLow Sheen, with Resene FX Metallic, Resene Hi-Glo Miox andunderstood in the form of a sphere where gradations occur on X,Y and Z axes.1-2.0: Perceptible through close observation its because thats the colour you or your client want somethingAluminium and Resene Non-Skid Deck & Path used for those 2-10: Perceptible at a glance to be. Sometimes, youre going to want to paint different typesfinishes.Theonlychartwithswatchesmadefrominkisthe 11-49: Colours are more similar than they are opposite of materials in the same Resene colour that are going to requireResene wood stains chart because it is not technically possible toyou specify both the Resene colour and the Resene product for 100: Colours are exact opposites different products to get the right adhesion and durability. Thesuccessfully finish the wood stain swatches with the same woodeach surface so that your client gets the authentic colour. There Resene Total Colour System has interlinked systems for decorativestain you would use on your project. Using actual Resene paintare many customers horrified to find their new colour doesnt look The lower a E figure, the greater the accuracy. A high Eand high performance coatings which allow you to achieve theimproves accuracy when youre sharing your plans for colour withlike what they expected, only to find later that another product was level, on the other hand, indicates a significant mismatch. As forsame spectrum of colours in a wide variety of products. your client as the paint colour on the swatch behaves the same waysubstituted and they didnt get the Resene finish they expected. the meaning of the term itself,or Delta is a Greek symbol thatThecolourlabatReseneisextremelyfussyabouttheEas it will on the wall. This is a false economy as it ends with frustrated and disappointed stands for the incremental change of a variable and the E standstheyre willing to settle for. When it comes to whites, they aim forEvery Resene colour is made with its own unique formulationsclients and more labour and product to repaint the surfaces in the for empfindungthe German word for sensation. So together, ita difference of 0.4 or less. It takes a lot of smart people doing ausing tinters which are made by, and exclusive to, Resene. Noauthentic Resene colour and paint. When it comes to painting, represents a difference in sensation. great deal of testing, finessing and rejecting of colours to meetmatter what may be said, a match is never a true match unlessmost of the cost is in the painting. Only a small fraction of the Understanding the meaning and standards of E is useful as itthat standard. But in the end, it means thatas far as your eyesit uses the original materials. You can buy a burger at a fast foodcost is in the paint itself, so it makes sense to specify the colour provides you a foundational metric of colour accuracy. Its a singlecan seeyou are going to have a seamless colour match betweenlocation or a burger at an upmarket restaurantboth in theory haveand paint so you can ensure your client gets the finish and colour figure that can be used to quantify whether colours are correctone material and the next. all the same ingredients: a burger bun, patty, lettuce and dressingthey are expecting.rather than relying on subjective opinions.yet the end result is drastically different. The same happens withBeyondsophisticatedtintingtechnology,theReseneTotal colours; the nuances of tinters, the undertone of each base andColour System also offers a wide range of services including colour How are colours measured? the way each tinter interacts with another means that colours willtools such as charts, drawdowns and electronic tools through to While you can use scales and rulers to measure weight and size,did you know? showdifferentundertoneswhenexposedtodifferentlighting.special colour matches and complete colour scheme development light is a bit more ambiguous. Resene uses colorimeters, whichThis is usually exacerbated when seen in combination with otherby specialised staff to help with the colour decision making process. are sophisticated tools that measure light through a set of opticalThe human eye has different sensitivities across the spectrum.colours, as the lighting changes and as the coating ages. Check out www.resene.com/totalcolour to stay on top of the XYZfiltersdesignedtomimictheopticalcharacteristicsofThe sensitivity is to pale acidic green/yellow hues. However, When youve done the hard work of designing a great project, itlatest developmentsand you may just find a new-to-you tool tristimulus (XYZ) values. Tristimulus values are the foundation ofa E of 5 is hardly noticeable in a strong, saturated red. deserves to be finished with quality and consistency; so make surethat can help make your next project easier. 60 blackwhitemag.com blackwhitemag.com 61'