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65

CHAPTER 2 

– Measurement functions

After the measurement of the solid patch, you 
can measure the %-patch, which you have 
defined in the setup.

The dot gain is checked in regard to its con-
formity to the ISO-standards.

Concerning the midtone the spread will be 
displayed additionally (CMY).

The deviation of the colors CMY is allowed to 
reach ± 4 % in the middle-tone of 40 % per 
ink .
But to avoid that the gray balance is disturbed 
too much, the spread limits the permitted dif-
ference between the highest and the lowest 
tonal value to 5 %.

Содержание SpectroDens

Страница 1: ...Manual Spectro Densitometer SpectroDens Software SpectroConnect...

Страница 2: ...can not fully guarantee the complete absence of errors TECHKON GmbH and the authors can not be held liable neither for any possibly incorrect statements nor their consequences Products that are not ma...

Страница 3: ...l know how to work with SpectroDens The second chapter will show you detailed insight into the measure ment functions and chapter 3 is about the Windows software SpectroConnect which is part of the pa...

Страница 4: ...es 77 CHAPTER 3 How to use the Windows software SpectroConnect 3 1 Software description 80 3 2 Installation 80 3 3 Overview Software module Compare colors 81 3 4 Software module SpectroDens settings 8...

Страница 5: ...ad dition to single measurements you can easily carry out scan measurements Tracking wheels on the bottom of the device make it possible to scan very fast up to 200 color patches at once on a print c...

Страница 6: ...Ugra Fogra media wedge Using the latest LED technology SpectroDens provides D50 illumination and there fore fulfills the M0 M1 M2 M3 measuring conditions in accordance to ISO 13655 The lifetime of th...

Страница 7: ...Ink trapping Printing curve Density spectrum Spectral density for spot colors Trend function ExPresso mini Slur dou bling Dot area to Yule Nielsen for printing plates LED technology provides mea surem...

Страница 8: ...h Windows software TECHKON SpectroConnect Contents of delivery of SpectroDens Optional accessories Exchangeable apertures Print control strips TECHKON TCS the digital print control strips TECHKON TCS...

Страница 9: ...or which analyzes the color spectrum of the measured sample The spectral data is the base information for cal culating densitometric and colorimetric data which is displayed Densitometric values can b...

Страница 10: ...lock pull the plug off the AC adapter and push in the new one Make sure it is connected firmly Connect the mains plug to the power socket The socket must be located near the facility and must be easil...

Страница 11: ...discharge and damage of the battery Charging starts automatically by placing the device on the charging console Please keep the charging contacts on the console and under the device always clean Five...

Страница 12: ...ight could pass through because this can influence the measurement On the bottom of the device there are tracking wheels which allow to drive easily and fast to the measurement point The color of the...

Страница 13: ...e cursor from soft key to soft key around the frame An active soft key is indicated by a frame By keeping an arrow button pressed the cursor travels from soft key to soft key at a constant speed until...

Страница 14: ...s often changed 1 The SpectroDens INFO screen informs about the type of device Basic Advanced or Premium the software and hardware version as well as the serial number It also indicates whether a WLAN...

Страница 15: ...he menu Language of the device 8 9 All measurement values get a Date and Time stamp This information will be visible when the data is transmitted to the PC soft ware SpectroConnect 10 For the measurem...

Страница 16: ...Trapping p 40 7 Printing Curve p 41 8 Printing Curve SCTV p 42 9 Printing Plate p 43 10 Slur and Doubling p 45 11 Density Graph p 47 12 ExPresso Mini p 48 13 CIE L a b p 51 14 CIE Color Circle p 53 15...

Страница 17: ...should be taken with out a polarizing filter By selecting Auto from the menu this will be taken into account and there will be automat ically the right filter setting 2 There are two possibilities for...

Страница 18: ...bration is as easy to carry out as a measurement Select the soft key Calibration and place the device with the measurement head on top of a blank area of the paper sheet The calibration can be started...

Страница 19: ...ews with a special TORX T6 screwdriver which is part of the package of a spare aperture set Clean the device casing and the display window only with a soft cloth and a non aggressive plastic cleaner N...

Страница 20: ...result Setting of the Density adjustment SLOPE With the SLOPE correction values it is possible to adjust SpectroDens to the density values of other devices Activate the soft key with the cogwheel ico...

Страница 21: ...play Now measure consecutively the solid patches of Cyan Magenta Yellow and Black A correct measurement is indicated by a green dot behind the respective color The SLOPE correction values are shown A...

Страница 22: ...has to be installed The module is available as accessory from TECHKON It is a small electronic board which can be inserted into the instrument easily Assembly of the WLAN module SpectroDens WLAN modul...

Страница 23: ...tection the board cannot be inserted in a wrong way After the WLAN module is inserted in its slot connect the battery cable again The plug has to clip into the socket When putting the casing together...

Страница 24: ...Searching Blue Connection established To be able to use the WLAN connection the function has to be activated in the settings of the instrument Notice To save power it is recommended to turn off WLAN...

Страница 25: ...rn on the instrument and connect it with the USB cable to the PC The symbol to the right of the serial number indicates the type of connection in this example it is an USB connection The WLAN settings...

Страница 26: ...AN network available Two types of WLAN connections are possible Infrastructure and Ad Hoc Infrastructure should be selected if a WLAN network is already installed in the working area Ad Hoc allows a d...

Страница 27: ...r network not be listed you can try again by clicking on Search again using SpectroDens Please enter the IP Address the netmask and the password of your WLAN network in order to connect You can enable...

Страница 28: ...ilable will establish a connection The gray color of the symbol is indicating the search function Once the WLAN network is found and the connection is established the color of the symbol will change t...

Страница 29: ...ivating the function Automatically search for WLAN SpectroDens the connection will be established automatically when used next time Now you can disconnect the USB cable The connection via WLAN will be...

Страница 30: ...ion To establish an Ad Hoc network select this function during the wizard setup The IP Address the netmask and the name SSID of the network are predefined in this case and will be shown for your infor...

Страница 31: ...serial number of your device Confirm the settings and check the connection Once the connection with your network card or WLAN USB stick is established you have to go back and click on Repeat search t...

Страница 32: ...ery plug has to be unplugged for a couple of seconds and then to be connected again Warranty The warranty for TECHKON products is 24 months starting with the date of purchase Consumable and wearing pa...

Страница 33: ...y density values are between 1 00 and 2 00 The second measurement has been taken on a Magenta patch The former Cyan measure ment still gets displayed Measurements of a specific process color will be o...

Страница 34: ...the referring density values for all four process colors are shown in a bar graph The values for Cyan Magenta and Yel low should be in close range to each other to ensure a neutral gray balance witho...

Страница 35: ...ance of 0 06 Therefore it is marked with a cross symbol in the round icon A checkmark symbol would be shown in case of a measurement within the tolerance limits The setting of reference values and tol...

Страница 36: ...on a patch which will be the future reference patch 2 Now activate via soft key Sample and make a measurement on a sample patch A triangle symbol in front of the measurement value indicates that delt...

Страница 37: ...ch The resulting dot gain can be easily calculated 59 40 19 The dot gain value gives the information to what degree a point is enlarged or de creased during each process step of the re production proc...

Страница 38: ...a density of 1 84 The double arrow points to the 80 meaning an 80 patch has to be measured next After the last measurement has been done in this case the 80 patch additionally to the Dot Gain value th...

Страница 39: ...resulting dot gain can be easily calculated 81 2 80 1 2 The dot gain value gives the information to what degree a point is enlarged or de creased during each process step of the re production process...

Страница 40: ...where the L and C values give the information of the printable gamut Three measurements are necessary Two measurements on each of the two separate process colors and finally one measurement on the res...

Страница 41: ...2 Dot screen frequency only relevant for the display of tolerance values 3 Increments of the wedge to be measured e g in 5 steps In the first step a 100 solid patch is mea sured SpectroDens recognize...

Страница 42: ...unction we recom mend to use a patch width of 5 x 5 mm min 4 x 4 mm with the standard aperture and a patch width of 4 x 4 mm min 3 x 3 mm with the exchangeable 1 5 mm aperture Printing Curve SCTV The...

Страница 43: ...ent process is subject to optical influences which increase the measurement value Therefore densitometers measure always a higher value than video analysis devices But the measurement value of the den...

Страница 44: ...t not imaged area of the printing plate as it would be a paper white calibration 2 Now measure a dark 100 imaged patch SpectroDens will select one of the four CMYK channels where the contrast signal i...

Страница 45: ...t image is caused by ink being re transferred to the rubber blanket which should have stayed completely on the printed paper To make the slur and doubling measurement possible it is necessary to have...

Страница 46: ...5 still are acceptable values higher than 10 indicate significant geometrical errors in print due to slur or doubling effects There are no standard values for the maximum allowable factor 3 The third...

Страница 47: ...e on a blue spot color The density graph is derived from the re mission spectrum and represents the den sity spectrum for wavelengths from 400 to 700 nm The peak of the curve displays where the spectr...

Страница 48: ...ced functions for the fast and comprehensive control of the printing quality during the printing process features the software TECHKON ExPresso 4 0 in connec tion with the automatic measurement system...

Страница 49: ...pared to reference densities pre set in the Density Reference Setup The reference data and the result will be dis played The reference line is always the refer ence value and the corresponding toleran...

Страница 50: ...e UV component of the source which activates the optical brighten ers is not specified Almost every color measurement device in the graphic industries works so far with this measurement condition This...

Страница 51: ...tical abso lute Black and 100 a theoretical ideal White The a value describes the color value on the Green Red axis a Green a Red and the b value the color value on the Blue Yellow axis b Blue b Yello...

Страница 52: ...g filter setting there will be automatically the polar izing filter inactivated when making colori metric measurements The color distance E describes how close two different colors match A value of 0...

Страница 53: ...C h or L C H values The measurement function CIE Color Circle as well as CIE XYZ and Remission Curve can be operated in absolute mode with DELTA ON or in comparison mode with DELTA OFF CIE Color Circ...

Страница 54: ...ent functions In the pop up window of the measurement conditions the item G7 Setup can be cho sen Now target values can be edited and printing conditions can be selected Edit the target values for SC...

Страница 55: ...or correct calculations Now the instrument is ready to measure The selected paper type and backing are indicat ed in the display When measuring solid inks the values are compared to the ISO reference...

Страница 56: ...rocedure works for all CMYK colors The selected paper type is always indicated The color detection works for trapping patch es as well The recognized type of patch is dis played in the printing order...

Страница 57: ...ended adjustments SC stands for Shadow Contrast The HR_cmy is detected as well The recom mended adjustments are shown by the ar rows and numbers HR stands for Highlight Range As soon as the value is c...

Страница 58: ...tected patch type 5 Measured value 6 Paper type 1 Color 2 Recommended adjustment 3 Adjustment as bar graph 4 Direction of adjustment 5 Detected patch type 6 Differences of HR_cmy and a b values compar...

Страница 59: ...the paper does not fall within the specified target values the accuracy of the press run is greatly diminished The more out of spec the paper is the worse the color match will be One member of the IDE...

Страница 60: ...d in the contents of delivery for example the HKS color books you can create your own color books for spot colors and use them as a reference The recommendations for amounts of ink supplied in terms o...

Страница 61: ...o the ref erence is 4 8 E After following the density trend it can be as low as approx 1 4 E A closer color match will be limited because the paper and ink characteristics do not allow to get closer t...

Страница 62: ...The value C stands for Chroma and the angular value h for hue L C h values are very popular because they describe colors in a simple way The further the color is located from the center of the color...

Страница 63: ...strip and the pa per type If you choose the TECHKON print control strip you can select two dot values additionally ISO 12647 2 defines the following standards Dot frequency 150 lpi 60 L cm Dot values...

Страница 64: ...en taken on a black solid patch At the same time the recommendation how to adjust the density is calculated The smallest possible E value is calculated in advance The measurement function ISO Check re...

Страница 65: ...d in regard to its con formity to the ISO standards Concerning the midtone the spread will be displayed additionally CMY The deviation of the colors CMY is allowed to reach 4 in the middle tone of 40...

Страница 66: ...patch width of 5 x 5 mm min 4 x 4 mm with the standard aperture and a patch width of 4 x 4 mm min 3 x 3 mm with the exchangeable 1 5 mm aperture ECI Gray Control Strips ECI bvdm tvi 10 i1 and M i1 ECI...

Страница 67: ...rmulas for calculating the color distance E can be selected as well The Euclidean color distance E a b is the most widely used although it is criticized that for certain areas in the color space the v...

Страница 68: ...mples under two exactly defined light sources The result of this operation is the Metamerism Index For the determination of the Metamerism In dex there are two measurements to be made 1 A reference me...

Страница 69: ...but reflects it at equal intensities in all direc tions For the purposes of this standard the color of such a surface is known as preferred white Whiteness is closely related to our vi sual perception...

Страница 70: ...wavelength of blue light as opposed to all wavelengths in the spectrum The higher the number on the brightness scale the more light a particular sheet reflects Brightness is just one part of the equa...

Страница 71: ...and from first to second row The measurement begins with patch A1 then A2 etc Wrong measurements can be corrected by pressing the red escape button and re measuring After all measurements have been p...

Страница 72: ...atches are displayed in the device Using the SpectroConnect Export module measurement data can finally be exported in any other Windows application e g Microsoft Excel Word or other programs which can...

Страница 73: ...rect number of patches and the colors are in the right sequence If the incorrect number of patches are scanned or the scanning speed is too fast or too slow the SpectroDens will display an error messa...

Страница 74: ...means that 98 of light is not allowed to pass through the paper Select the Opacity function from the mea surement functions menu Place the sheet of paper to be a measured on a black backing In the ne...

Страница 75: ...ents used and the shade of the paper Choose the function OBA Check from the menu measurement functions First you have to switch to the soft key CAL to carry out a calibration on the absolute white sta...

Страница 76: ...measurement can be set started and cancelled Here the Number of measurements to be calculated to one average value is set The maximum number of single measurements is 9 Now activate Start Average mea...

Страница 77: ...p to 20 color books with a total number of 25000 reference values Reference memory To access the Reference memory you have to select Reference in the display A mem ory capacity for 300 references is a...

Страница 78: ...he pop up window opens by pressing the enter button with the device in Sample mode 3 By activating Save automatically all future reference measurements will be stored auto matically 4 By activating Se...

Страница 79: ...n a color book compared to a sample value Color book memory Additionally to storing reference and sample color values complete Color books can be managed A color book is a folder which can hold up to...

Страница 80: ...00 sample values and 20 digital color books which can contain up to 25000 color values When connecting the device to the PC via the USB cable all stored values will be uploaded to the software and dis...

Страница 81: ...dard Windows applications They comprise New Open Save Print and Quit 2 The window Samples shows samples which are stored in the device Only in Spec troDens Advanced and Premium available 3 The window...

Страница 82: ...display 3 Device update New device software can be uploaded into the device There are two different types of files to upload Device update loads the new version of device software Device upgrade upgr...

Страница 83: ...ted by Device update or SpectroDens can be expanded in functionality by Device upgrade The SpectroDens Basic model can be extended via data upload to Advanced or Premium functionality without the need...

Страница 84: ...ike the keyboard Pressing the measurement button will place the measurement value automatically at the location where the cursor is 1 Here is defined which data will be trans mitted how it will be for...

Страница 85: ...lf created color book is carried out The lower part of the module window informs you about the exact color deviations between the sample and the recommended color of the color book 1 Selected ICC prof...

Страница 86: ...mouse pointer directly to the center of the display where the L a b color circle is A pop up window will ask if the values should be used as sample or as reference values 4 A mouse click on the progra...

Страница 87: ...w the trend of L a and b values of a measurement series The Table View shows all values numeri cally In the Job window job relevant text data can be edited 3 A measurement value highlighted in red ind...

Страница 88: ...and the size of the toler ance circle is set 3 Mean values It can be appropriate to take several single measurements on one sample which then are averaged to an average value The number of measurement...

Страница 89: ...module Media Wedge is only available in the SpectroDens Premium version 1 Manual selection of the media wedge ver sion You will find the version number on the printed test element The software support...

Страница 90: ...d details After the import of the media wedge a short protocol will be generated and can be printed on a self adhesive label with a Dymo label printer The software supports the Ugra Fogra Media Wedge...

Страница 91: ...gets or individual standards The software calculates at the same time com pensation values for the adjustment during plate exposure Values for CMYK as well as spot colors can be analyzed Measurement r...

Страница 92: ...92 Manual TECHKON SpectroDens In the section Target values the target values can be edited Furthermore settings for the assignments of the targets can be defined...

Страница 93: ...3 11 Software module ISO Report The software module ISO Report allows a fast and comprehensive documentation according to the ISO standard The ISO Report can be printed out ISO Report is only availabl...

Страница 94: ...e the target you wish to use Additionally you can determine its patch width and the amount of patches per row 2 The resulting final size of the target will be calculated automatically and then display...

Страница 95: ...vice Connect SpectroDens and SpectroCheck via the USB cable with the computer The program module SpectroCheck will now lead you step by step through the checking procedure of the measurement device Th...

Страница 96: ...ite standard integrated and protected in charging console Illumination types A C D50 D65 F 2 7 11 Standard observer 2 10 Density filter DIN 16536 DIN 16536 NB ISO ANSI T ISO ANSI I ISO E spectral dens...

Страница 97: ...is granted pursuant to the Japanese Radio Law and the Japanese Telecommunications Business Law This device should not be modified otherwise the granted designation number will become invalid The devic...

Страница 98: ...white calibration be fore every measurement series to ensure the device is calibrated correctly The remission values documented on the back of the charging console are derived from a ceramic white st...

Страница 99: ...ssential requirements of the 2004 108 EC Directive if used for its intended use and that the following standards has been applied r pond aux exigences essentielles de l article 3 de la directive 2004...

Страница 100: ...put my E mail address on the mailing list for the TECHKON Newsletter TECHKON GmbH Wiesbadener Str 27 D 61462 K nigstein Via telefax to 49 0 6174 9244 99 Please copy this registration card and send it...

Страница 101: ...TECHKON GmbH Wiesbadener Str 27 D 61462 K nigstein T 49 0 6174 924450 F 49 0 6174 924499 info techkon com www techkon com Erfolg ist messbar...

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