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How to Use the Chart In the printing process, the relationship between the substrate (paper), LPI (lines per inch), SID (solid ink density), TAC (total area coverage), gray balance and NPCD (neutral print density curves) combine to affect the quality of the printed output. The GRACoL 2007 Print Characterization Chart specifies values and tolerances for input variables and output goals for commercial printing for a #1 or #2 sheet. The chart includes variables for both a premium coated paper and premium text and cover substrate. The goal of the chart is to facilitate communication and expectations between the print buyer, creative, premedia/prepress service provider and the printer. Using this chart you can select a set of input variables and have a clear expectation of the output parameters that meet GRACoL quality. This new chart differs significantly from the chart published with previous GRACoL editions. These differences reflect the important new G7 variables that help to maintain a constant visual appearance from proof to press and from press to press. For example gray balance is defined at 50% C, while neutral print density is defined for 25%, 50% and 75% CMY gray patches, and K 25, K50 and K 75%. Maintaining gray balance and gray density at the midtones are key G7 metrics. Gray Balance is specified in CIE a*b* at 50,40,40 CMY with target a* equal to paper a*/2 and target b* equal to paper b*/2, with a tolerance of ±0.5 a* for proofs and ±1.0 a* on press, and ±1.0 b* for proofs and ± 2.0 b* on press. The chart also provides Paper CIELab Values, and CIELab values for the primary Ink solids. Tolerances & Variation Variation is part of the printing process. The GRACoL 2007 Print Characterization Chart specifies tolerances. Even using the G7 Proof-to-Print Process, variances should be expected. Some printers may suggest that their printing parameters differ from those listed here. For example a printer may suggest using a 200-line screen or vary their ink densities. While this may enhance print properties such as resolution, there can be a penalty if the same allowances are not made in proofing and other areas such as file preparation. Print buyers need to understand that printers offering to print “better” than a specification such as GRACoL 2007 or SWOP 2007 may well be able to do so, but files and proofs generated by that printer may not be interchangeable with another printer, and vice-versa, without careful color management. Some Important Definitions in Quality Control Several definitions will help you understand and use the GRACoL 2007 Characterization Chart. These are: CIE L*a*b* (CIELAB): A 3-D color space mathematically derived from CIE xyz chromaticity coordinates resulting in greater perceptual uniformity. L* = neutral light-dark axis, a* = red/green axis and b*= blue/yellow axis. CMYK: Four-color process printing uses CMYK― that is Cyan (also called process blue), Magenta (process red), Yellow (process yellow) and black inks to create all colors. lpi: Lines per inch or Line Screen (LS) is the numberof lines of dots per linear inch in a halftone screen. The lower the line screen number (fewer dots in an inch), the larger and more widely spaced the dots which produces less dot gain. Higher line screen rulings (more dots) can contain more image information and produce fi ner detail if they are used on a paper stock of high enough quality. Higher line screens produce more dot gain. NPDC: Neutral Print Density Curve is the relationship between the measured neutral density and original halftone percentages on a gray scale. Solid Ink Lab Values: Color information that is used to specifi cally map a color gamut. These measurements a extremely useful for ink manufacturers and color management experts. SID: Solid Ink Density is a numerical measure of how much complementary (major filter) light is absorbed by a solid patch in a color control bar as measured and reported by a reflection densitometer measured dry with instrument calibrated to Status T. TAC: Total area coverage defines in percentage terms the total amounts of cyan, magenta, yellow, and black in the darkest area of the printed image. Theoretically, the blackest area would benefit from being produced with maximum ink amounts totaling 400%. However, in four-color process printing, that would cause problems in production press operation. Total area cove rage should be checked in the heaviest (darkest) area of the film or electronic fi le and read in the same spot on each color. Look for the appropriate TAC for each print condition in the color preferences setup for the color separation software. [Source GRACol]
PROOFING with GRACoL® 2007 / Colour Measurment / Colour Proofing GRACoL® 7 Specification for Commercial Printing on a #1 Coated Sheet In an ideal world, each commercial sheetfed offset printing job should exceed the customer’s expectations. The printer should be able to match the vision of the creative in the finished product on press. But in the real world, a multitude of creative, premedia, prepress and printing variables often prevent printers from meeting the customer’s expectations. The good news is that with this latest version of GRACoL, we have come a long way toward fulfilling the vision. GRACoL 2007 signals a revolution in printing because for the first time a specification has been designed to provide printers with the ability to visually match output from proof to press and even from press to press. GRACoL leverages new technologies such as spectrophotometry and CTP, as well as taking a lesson from photographers about how color is perceived by the human eye to develop metrics and process controls that assure better visual likeness on press regardless of mechanical variables like dot shape or screen ruling. Previously GRACoL and other printing specifications have been based on measuring and controlling TVI/dot gain for each printed color. But GRACoL 2007 has broken from this tradition by setting printing aims based on colorimetric data for gray balance and a standardized “Neutral Print Density Curve” (NPDC), rather than on traditional TVI aims for each ink. This new philosophy allows a careful user to achieve a closer visual match from device to device, while maintaining the same overall “appearance” of traditional printing. G7, the new process control method that was developed by the GRACoL Committee with the assistance of the Print Properties Working Group is documented in the following section of this publication. Here we represent the new GRACoL 2007 Specifications embodied in the new Characterization Data Set in the form of the Print Characterization Chart.
GRACoL® Print Characteriztion Charts Profile GRACoL2006 Coated1.txt SWOP2006 Coated3.txt SWOP2006 Coated5.txt SCB Paper / Substrate Grades #1 & #2 Premium Grade #3 Grade #5 SuperCal SuperCal SCA SuperCal publication publi. SCA+ gloss/dull coated text & cover LPI (for reference only) 175 150-175 150 133-150 133-150 120-133 120-133 TAC 340% 260% 310% 300% 280% 260% 240% Paper L*a*b* L* 95 93 90 a* 0 0 0 b* -2 0 4 L*a*b* aims D50 over white backing K L* 15 18.50 18.97 a* 0 0.01 1.10 b* 0 -0.12 1.18 C L* 55 57.06 56.63 a* -37 -36.97 -37.92 b* -50 -45.05 -40.92 M L* 48 47.99 47.76 a* 74 71.92 69.73 b* -3 -3.10 -3.57 DEab of 5 or less for all colors Y L* 89 88.08 85.46 a* -5 -5.09 -5.85 b* 93 87.90 84.52 2007 Densities K 1.70 / 20 21 21 /TVI C 1.45 / 17 18 18 M 1.45 / 17 18 18 Y 1.00 / 16 17 17 Densities are suggested starting points L*a*b* takes precedent Neutral Density Aims minus Paper Density CMY/K 25C/19M/19Y 25% .25 /.22 .25 /.22 .25 /.22 .25 /.22 .25 /.22 .25 /.22 .25 /.22 50C/40M/40Y 50% .54 /.50 .53 /.49 .54 /.49 .54 /.49 .54 /.49 .52 /.50 .52 /.51 75C/66M/66Y 75% .90 /.90 .86 /.83 .89 /.87 .89 /.86 .86 /.87 .83 /.85 .83 /.85 [Source: g r a p h i c a r t s m o n t h ly M a y 2 0 0 7 ] The GRACoL and SWOP characterization datasets can be downloaded from www.gracol.org/resources/datasetdownload
About Offset printing inks - how they are formulated Inks for sheetfed as well as inks for heatset web offset printing are structured lithographic paste inks and generally consist of a varnish, pigment and extender, mineral oil distillate, vegetable oil and additives. Ink composition Varnish The varnish is the binding agent and consists of hard resins, chemically modified wood resin and synthetic hydrocarbon resin, soft alkyd resin and a mix of vegetable oil and mineral oil distillates. The mix is cooked to dissolve and disperse the hard resin, thus forming a homogeneous varnish. Pigments The colorants in the inks are synthetic organic pigments, not to be confused with natural pigment or with dyes. For black ink, carbon black is used as the pigment. The amount of pigment and extenders (chalk/clay) depends on the desired colour and structure of the ink. Mineral oil distillate and vegetable oil Sheetfed inks are designed for drying by oxidation (skinning). Certain vegetable oils harden under the influence of oxygen from the surrounding air. The most commonly used type is linseed oil. A dryer catalyst accelerates the drying process. For the heatset printing process it is necessary to use a diluent that can be evaporated in a hot air dryer. For this reason, a fraction or distillate of mineral oil with a boiling range of 240–290 °C is used. The function of this diluent is to act as a “carrier” for the resins and pigments and to allow the final formation of an ink film of about 1 micron thickness on paper. Additives Certain additives are used for the pigment grinding process or to provide specific ink properties which have an effect on the lithographic behaviour of the ink on press. Waxes are used to improve the rub resistance and slip properties of the dried ink film. In sheetfed inks certain agents are used to create an appropriate balance between the drying properties of the printed ink film and the skinning tendency of the ink surface in an open can or ink duct. [Information based on sappi, Brochure 8, Paper, Ink and PressChemistry, p11 &12 "Sappi is committed to helping printers and graphic designers use paper in the best possible way. So we share our knowledge with customers, providing them with samples, specifications, ideas, technical information and a complete range of brochures." Thanks for doing so.]
About Offset Printing Ink / Mực In Offset (Đức / Hàn Quốc)
Mực Number One: Chất lượng Tốt, Giá cả Cạnh tranh!!!! Mực In Offset tờ rời Korea, theo tông màu Châu Á, được sử dụng để in các ấn phẩm cao cấp như: Bao bì, Catalogue, lịch tết, brochure, tạp chí, thiệp cưới, các ấn phẩm quảng cáo..... thích hợp cho các ấn phẩm đòi hỏi tốc độ in cao, mau khô. In trên các loại giấy có độ láng như: giấy Couche', giấy Duplex, giấy Ford ..
Quy cách sản phẩm / Có các màu cơ bản như: Mực xanh Cyan #1 NumberOne (01kg / hộp) Mực đỏ Magenta #1 NumberOne (01 kg/ hộp) Mực vàng Chanh #1 NumberOne (01 kg/ hộp) Mực vàng Nghệ #1 NumberOne (01 kg/ hộp) Mực đen Black #1 NumberOne (01 kg/ hộp)
Tối ưu đường truyền mực in offset Mực in Offset. Khái niệm: Mực in là một chất màu được pha chế từ nhiều thành phần khác nhau dùng để tạo ra sự tương phản về màu sắc trên ... Trên các dòng máy in offset tờ rời Heidelberg có trang bị các chức năng nhằm hỗ trợ cho việc tối ưu hóa đường truyền mực, mục đích làm tăng chất lượng in và ... Nhà cung cấp vật tư chuyên nghiệp VINA TÂM hiện đang cung cấp mực Hàn Quốc chất lượng tốt phù hợp yêu cầu của thị trường với giá cả cạnh tranh mang tên NUMBERONE ...
K C M Y 80% 40% 0 K C M BAL Y BAL S/D C+M K C M Y BAL 80%40% 0 K C M Y BAL S/D C+Y K C K C M Y BAL S/D M+Y K C M Y BAL 80%40% 0 K C M Y BAL S/D K 5% 4% 3% 2%
The TECHKON Spectro series Good printing is a matter of quality ! The key to success is to control all steps of the process which lead to the printing product. The Spectro series provides you with the perfect tool for each of these steps. SpectroPlate is the ideal device for checking the quality of a printing plate. Today in the age of Computerto- Plate it is obvious: Without quality control in pre-press, there is no guarantee for quality in print ! Concerning colorimetric and densitometric measurements on printed products, the precise and compact hand-held measurement device SpectroDens is a real all-rounder. It is full of functions but nevertheless easy to use. Direct positioning of the measurement head on the measurement field ensures a secure and quick measurement. When it comes to automatic measurement and analysis of complete print control strips, the TECHKON scan-measurement devices are used. SpectroJet is quickly guided by hand along the color bar. Optionally a guidance track supports this task, when long print control strips have to be measured. SpectroDrive is motorized and therefore scans a print control strip automatically. Both devices have a high speed of measurement in common and directly transfer the measurement data to the powerful but user-friendly Windows software TECHKON ExPresso or to other programs that control printing machines. The world of TECHKON As a long-established company we have more than 25 years of experience in the development and manufacture of high-quality spectral measurement technology. One core area is the development of products for quality control in the printing industry. The color measurement instruments of the TECHKON Spectro series are regarded as the industry benchmark. A second focus is the product range of material analysis solutions with ElementCheck as our main product. One of our specific strengths is our ability to tailor our solutions to specific applications. Our philosophy here: We observe and understand your application, deal with the complexity of the measurement technology and deliver you simple-to-use measurement solutions, which make your work safer, easier and more efficient.
The advantages at a glance PRECISE Patented measurement head for exact and direct positioning Precise spectral engine Automatic measurement function displays always the relevant values Measurement values can be memorized with date and time tag Devices are factory-made calibrated permanently FAST Immediately ready to use after switching on All measurement functions quickly accessible Quick measurement Up to 10.000 measurements per battery charge* Rechargeable high-capacity batteries; battery level control* USB port for easy and speedy transfer of measurement data to a PC ROBUST Robust design for reliable function in a harsh industrial environment Durable precision; device is maintenance free ERGONOMIC Ergonomically positioned, user-friendly measurement button Handy and compact Self-explanatory operation VERSATILE Several dialog languages available Download of additional functions and device upgrades via PC Comprehensive software SpectroConnect included * except for SpectroJet
Why measurements on printing plates ? Today in the age of Computer-to-Plate it is obvious: Without quality control in pre-press, there is no guarantee for quality in print. Thus the measurement of the right dot transfer on offset printing plates is a key segment of comprehensive process control in the printing industry. However, measurement is only useful if the appropriate measurement technology is applied. Some years ago using densitometers on printing plates was common practice. But densitometers are designed for measuring on printed papers leading to limits when reading on plates. At present, plate measurement devices based on microscopic image capture and processing are the established standard. TECHKON SpectroPlate unifies all advantages of this modern measurement technology in a compact, hand-held instrument. How does SpectroPlate work ? The measurement accuracy of a plate-measuring device is determined by the quality of the optical system and the performance of the image processing algorithms. SpectroPlate meets the highest standards in this respect. The sample is illuminated uniformly with spectral broadband light. The microscopic image is captured by a precision optical lens system and a high resolution CMOS color matrix sensor with high dynamic range. The processing of the detailed color image is performed by a powerful graphic signal processor and sophisticated imaging algorithms. All relevant quality parameters for correctly manufactured printing plates are shown on the LCD display. Versatile in use Thanks to the excellent image capture quality and the ingenious graphic calculations, SpectroPlate can read precisely any screen size and screen technology: FM, AM or Hybrid screen. The spectrally white illumination and dynamic color evaluation permits reading all kinds of plate types and coated surfaces. But it is not only plate reading where SpectroPlate shows its strengths. The multifunctional device handles dot measurement on film as well as on printed paper in CMYK-print excellently. Portable Microscope SpectroPlate lets you see things normally hidden to the human eye. It shows the raster dots on a film or a printing plate in large magnification on the device display or optionally on a computer screen. It lets you visually judge printing plates and discover any soiling or exposure errors now that the structure of the raster dots is visible. A specific strength is the image transfer of uncompressed high-resolution files to the PC where they can be stored, edited or sent over the internet. Geometric sizes of dots or lines can be retrieved in micrometer-or mils-dimensions. Software SpectroConnect The supplied Windows software connects the device to a PC. Measured values and transfer curves are displayed and stored. The display of comparisons to target values, the data export to Microsoft Excel™ and the compatibility to RIP-applications are additionally useful functions of SpectroConnect. An exceptional feature is the enlarged view of the microscopic images. Versions and functions SpectroPlate is available in three different types of performance packages: The entry-level model Start is for dot percentage measurements on all popular types of printing plates, film and CMYK print. The Expert-version additionally features the recording of complete transfer curves and the possibility to analyze geometric objects within the device. The All-Visionmodel features supplementary the measurement of processless, low-contrast printing plates.
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