Summary of OKIPAGE 8c Plus
Page 1
Colour guide.
Page 2: Brilliant Colour From Oki
2 okipage 8c plus brilliant colour from oki thank you for choosing the okipage 8c plus colour page printer. The okipage 8c plus offers brilliant colour printing at a fast 8 pages per minute on plain paper and 5 pages per minute on transparencies - the okipage 8c plus is the perfect workgroup printer...
Page 3: English
Colour guide 3 english contents brilliant colour from oki .............................................. 2 the use of colour ........................................................... 4 colour perception ......................................................... 5 the electromagnetic spectrum .........
Page 4: The Use of Colour
4 okipage 8c plus the use of colour recent advances have brought colour to the desktop in a way that could not have been imagined a decade ago. It has been shown that using colour in print can increase memory retention by up to 65% and readership by as much as 40%, not to mention the added impact th...
Page 5: English
Colour guide 5 english the following examples list some widely used colours and their significance: this is a very powerful and passionate colour. The power and passion that it portrays has made it a favourite for many exotic sports cars. Unlike red, green is a very calming and ‘natural’ colour. It ...
Page 6: The Electromagnetic Spectrum
6 okipage 8c plus light interacts with an object and what we see is the final result of that interaction. An object can reflect, transmit or emit light. A reflective object absorbs some sections of the visible spectrum and reflects the rest. What we see is the reflected portion. An object removing w...
Page 7: English
Colour guide 7 english primary and secondary colours in theory, all colours can be made up from a very small group of ‘colour elements’. There are three primary colours, and all other colours can, in theory, be obtained by mixing the primary colours in varying proportions. Mixing two primary colours...
Page 8
8 okipage 8c plus additive primaries video technology such as computer monitors and television screens use the additive model. The additive primaries are red, green and blue (rgb). Starting from black (lack of colour) and adding red, green and blue in equal quantities will generate shades of grey wi...
Page 9: English
Colour guide 9 english in theory, a combination of the three subtractive primaries will produce black. In practice however, pigments used in inks are not perfect and usually give rise to a dark green/ brown. For this reason, in many colour output devices, a separate black ink is used to produce grey...
Page 10: Colour Wheel
10 okipage 8c plus colour wheel the relationship between colours can be best shown on what is known as a colour wheel. The hue value of a particular colour is expressed in degrees. Red for example is at 0° and green and blue are located at 120° and 240° respectively. The subtractive primaries, yello...
Page 11: English
Colour guide 11 english the problems with using colour as already explained, a computer monitor, where an image is first viewed, and a printer which produces the final document use different methods to generate colours. Indeed they are based around a different set of primaries (rgb for monitors, cmy...
Page 12: Specifying Colour
12 okipage 8c plus although colour has its obvious benefits, it has also created a whole new set of problems that need to be dealt with: • it is important not to go overboard and add dashes of colour without thought as this will undoubtedly have a negative effect on the whole purpose of using colour...
Page 13: English
Colour guide 13 english the printout from this set of numbers should produce a colour close to the original. Due to the variation in printer inks however, it may be necessary to make minor adjustments until the right combination is found. Once a colour match is obtained, the rgb components should be...
Page 14
14 okipage 8c plus printing colour no matter how colours are specified, the printer is only able to use a combination of three colours plus black to generate an image on paper. To achieve this the printer uses processes known as halftoning and dithering. Each addressable picture element (pixel) on a...
Page 15: English
Colour guide 15 english colour adjustments certain images such as bitmaps, sometimes print with a strong hint of a particular colour. Images that appear fine when viewed on a monitor may not necessarily print that way due to the reasons described previously. The colour that appears to dominate the p...
Page 16
16 okipage 8c plus the okipage 8c plus printer driver there are various features designed to allow you to achieve the best results with your okipage 8c plus. The colour options tab within the printer driver provides a list of colour matching techniques and adjustments which can be applied to your gr...
Page 17: English
Colour guide 17 english print colour swatch this button prints a sample of each colour together with its red green blue component values. A choice of 4 pages or 12 pages is available, depending on the colour range you want to see. If you have problems matching particular screen colours to the printe...
Page 18
18 okipage 8c plus manual colour ajustment screen match colours are printed so that they resemble those on-screen. This may not work in practice because brightness, chroma and contrast settings on each individual monitor cannot be allowed for. Unadjusted colour no colour matching is performed and da...
Page 19: English
Colour guide 19 english glossary brightness along with hue, and saturation, brightness is one of the three dimensions of colour. It is the property that describes the intensity of light reflected or transmitted by an object or source, independent of hue or saturation. Cluster-dot screening this is a...
Page 20
20 okipage 8c plus ycc this system was developed by kodak for encoding colour images for display on video monitors. Rgb values are converted to a luminance component (y) and chromatic components (c1) and (c2). Cie in 1931 the commission internationale de l’eclairage (cie) devised a colour system bas...
Page 21: English
Colour guide 21 english grayscale differing shades of grey ranging from black to white. Eight bits of data will produce (2 8 ) 256 shades of grey. Halftoning a printed image is composed of dots (or pixels). The spacing of these pixels can give the illusion of shades or tone. Increasing the spacing o...
Page 22
22 okipage 8c plus registration this describes the alignment of the various colours when printing. As each of the process primaries are specified by their own plate and printed individually, it is important that the ink is placed in precise locations or colours will not align to produce the desired ...
Page 23: English
Colour guide 23 english index a additive primary ........................... 8 b brightness ................................... 19 c cluster-dot screening .................. 19 cmyk model ............................... 9 colour adjustments ............................. 15 complements .................
Page 24
24 okipage 8c plus r registration ................................. 22 s saturation .................................... 22 secondary colour .................. 7, 22 spot colour .................................. 22 subtractive primary ....................... 8.