Colour: That it is?
It results of the differences of perceptions of the eye to distinct wavelengths, that compose what designates the “spectrum” of the white light reflected in a leaf of paper. These visible waves are those whose wavelength is comprised between the 400 and the 700 nanómetros: further of these limits follow existing radiations, but no longer are perceived by our sight.
That it is model of colour RGB?
The mix of colours light, usually red, green and blue (RGB, initial in English of the primary colours), realises using the system of colour additive, also referred like the model RGB or the space of colour RGB. All the possible colours that can be created by the mix of these three lights of colour are alluded like the spectrum of colour of these lights in concrete. When any colour light is present, one perceives the black. You dye them light have application in the monitors of a computer, televisions, proyectores of video and all those systems that use combinations of materials that fosforecen in the red, green and blue.
Chromatic circle CMY
For impression, the colours used are cian, magenta and yellow; this system is designated model CMY. In the model CMY, the black is created by mix of all the colours, and the white is the absence of any colour (assuming that the paper was white). As the mix of the colours is sustractiva, also is called model of colour sustractivo. A mix of cian, magenta and yellow actually results in a muddy black colour by what usually uses black ink of truth. When the black is added, this model of colour is designated model CMYK. Recently, it has showed that in the model of colour CMYK is also more precise pair the mixes of pigment.
Has to take into account that only with some fictitious “primary” colours can arrive to achieve all the possible colours. These primary are arbitrary concepts used in models of mathematical colour that do not represent the feelings of real colour or even the real nervous impulses or cerebral processes. In other words, all the perfect “primary” colours are entirely imaginary, what involves that all the primary colours that use in the mixes are incomplete or imperfect.
What is luminosidad, cromaticidad and tone
The tone: it Is the nuance of the colour, is to say the colour in himself same, supposes his chromatic quality, is - simply- a synonymous of colour. It is the quality that defines the mix of a colour with white and black. It is related with the wavelength of his radiation. As his tonality can say that a colour is red, yellow, green...
The brillantez or luminosidad: it Has to see with the intensity or the level of energy. It is the luminosidad of a colour (the capacity to reflect the white), is to say, the shine. It alludes to the clarity or darkness of a tone. It is a variable condition, that can alter fundamentally the appearance of a colour. The luminosidad can vary adding black or white to a tone. In general, with the pure tones that have a more luminous value (yellow, orange, green) achieve the best clear variants, whereas the pure tones that have usually a value usually less luminous (red, blue, violet) offer the best dark variants.
The saturation or cromaticidad: it Is related with the chromatic purity or fault of gave lución with the white. It constitutes the purity of the colour with regard to the grey, and depend of the quantity of present white. What more saturated is a colour, purer is and less mix of grey possesses.
What is gain of point?
Gain of point: treat of the increase in the tonal values of the point of plot (is to say, the relative surface that occupies in the plot) that experiences in the diverse graphic processes by which crosses.
The original point has a value of 50%.
The past of iron elevates it a 2%, with which now measures a 52% concerning the original
The impression elevates it another 12% concerning the initial value, by what have a 64% real
The called optical gain elevates it another 8%.
The final result is a real point of 72% of tonal value of plot. Very far
What is Moairé?
It is an optical illusion that appears when the angles of twist gives each colour of the cuatricromía find , forming a superposición of the points in species of cuadricula.
What is plot?
The points bendéi invented them in the 19th century Ben Day, and is a pattern of points that transform in a technician of impression, defined like gradations of colour in lines and textures, is to say, the different areas of an illustration that could fill up with small geometrical and circular forms.
Which has to be the necessary pressure?
If one consulted to the impresores and converters of the actuality on how much pressure is necessary to be successful, would receive a lot of answers and different opinions. Some think that it is necessary to squeeze the iron to transfer of suitable way the ink, knowing very well that the high gain of points and the premature wear of the iron are a likely consequence of this action. Others think that a “soft pressure” or “pressure to the kiss” is the best way to attain an optimised reproduction of the high lights, but are concerned on the possibility to sacrifice the density of the solids. Independently of which are the way chosen, the majority of the impresores agrees in that the minimum impression is the key, and look for constantly ways to balance the gain of the points and the density of the solids.
What is policromía?
It is the superposición of the four colours process to form an image and obtain a space of similar colour to the of the nature, the policromía is the technician of impression but used to world-wide level in any system of impression, because it is the only system that exists to reproduce images that involucren all the range of colours.
The order of impression of the colours is independent in each system of impression, the varied order.
What is the roller anilox?
Regulatory roller of ink used in impression flexo graphic. Manufacture in steel cromado recorded mecánicamente or ceramic recorded by means of laser to have of a surface with micro cells with which controls the level of ink that transmit in the process of impression. This ink collect of a cubeta and transmit to the support of impression that, to his time, prints the image in the support receptor.
A roller ánilox selects defining:
That is the doctor blade?
It calls Doctor Blade to the plate or espátula that to way of scraper (in the impression by huecograbado and flexografía), raisin on the surface entintada of the cylinder impresor or the roller ánilox, withdrawing the excedente of ink and leaving it only in the celdillas or grooves in bajorrelieve that conform the image to print.
What is a first?
First for the anclaje of inks
The chemical method for the preparation of the acceptance and anclaje of the ink in the plastic film, is the impression by method flexografico or huecograbado of a transparent film, to base of resins acrílicas or solvent hard, that do a bridge of anclaje between the support and the inks that can apply by the different methods of impression.
What is a treatment tops?
A system designed for incrementar the superficial energy of the film plastic, aluminiums, to promote the adhesion and anclaje of inks, coatings and adhesive of the surfaces.
What is an ink?
An ink is a mix homogénea of matter colorante, resins, dissolvent and some additives whose purpose is to reproduce an image on a support by means of a process of impression.
That it composes an ink?
The ingredients used in the manufacture of the inks of printings, can divide in three main groups:
How it forms an ink?
The inks are formed by:
To. Substances colorantes that to his time can be:
To.1. Inks or colorantes that they are soluble substances in the vehicle.
To.2 Pigments. Substances that are not soluble in the vehicle if no that it have disperse in him in form of fine particles.
What is an ultraviolet radiation?
It designates ultraviolet radiation or radiation UV to the electromagnetic radiation whose wavelength is comprised roughly between the 400 nm (4x10-7m) and the 15 nm (1,5x10-8m). His name proviene that his rank begins from wavelengths shorter of what the humans identified like the violet colour. This radiation can be produced by the solar rays and produces several effects in the health.
What is a system of direct impression?
This wants to say that the iron once entintada, transfers directly the ink to the support, thus when we see this iron observed that the texts of the image read the other way around so that in the support form read properly.
Example: impression flexo, letter press, huecograbado.
What is a system of indirect impression?
This wants to say that the iron once entintada, transfers the ink to the mantilla and is directly to the support, thus when we see this iron observed that the texts of the image read to the right and in the mantilla read the other way around so that in the support form read properly.
Example: impression offset, digital offset.
Taken of Arclad