BSS AntiCopy User Manual
Contents
1. BSS ANTICOPY 1 0 7 BSS Micropatterns Rasters Micropatterns are created with the use of a special editor application enabling the user to view change create new rasters as well as to delete unneeded ones All the micropatterns compose a library stored in the Halftones directory in the form of separate files hlf px Mew Delete Select Close Dot Shape Modulation parameters Frequency o Angle 5 Wave 5 58 Softness D Expand p m pit 1 4 Displacement o E E Color H Line2 Editor commands New Create a new micropattern Delete Delete the selected micropattern Select Select a micropattern to make a latent image Close Close the editor window BSS ANTICOPY 1 0 8 BSS Depending on the basic form of micropattern the application provides the following types of rasters None a special type not altering the source image Hound raster made of round dots AN the form of lines Euclidean rasterizing with Euclidean dot Ellipse ellipse shaped raster dot 7772 quare shaped raster dot WawWaWawWaWaWawWawWAa2. the integral density of the source image Is similar to the integral density of the processed image The area to be marked with latent image will be indicated by the user interactively The latent image itself will be selected by the user from the library inscriptions COPY VOID etc or submitted by the user in a form of a graphic file The micropattern will be created by the user in a special editor application Aside from common rasters lines various types of dots the user will be provided with a capability to create own micropatterns The result will be saved in a graphic file in the TIFF or EPS format The algorithms integrated into the software allow implementing the following methods of insertion of latent images that will be visible on photocopies 1 Use of various kinds of hatches by multidirectional lines and of special rasters superimposed at different angles As a result at photocopying Xeroxing of such patterns a specific picture a moire pattern appears on the photocopy being absent on the original copy TER ER TE 1 Ear 2 Copiers reproduce vertical and horizontal lines in different ways An advantage can be taken of this particularity in the following manner a part of the image is hatched with horizontal lines another part being hatched with vertical ones Lines in this instance can be replaced by oblong rectangles or ellipses It is to note that this method will not be advisable i
3. of the source image presentation Thus for example a printing of 20 grey copies with different parameters of rasterizing will show that sight perception of the copies is different one copy will be darker the other one brighter The main task of calibration is therefore elimination of visible differences in reproduction of halftones BSS ANTICOPY 1 0 4 BSS Preparation of Source Image In the quality of source processing data they can use a solid background of the given color or a graphic image taken from a file When using a solid background the user is given a capability to set dimensions of the source image When using a graphic image the size is set automatically Source width 28 Height 2 Width Width of the image in millimeters f Solid color Custom t Image Height Height of the image in millimeters Parameters Solid color Solid background of the given color Image Graphic image transferred from a file When selecting solid color as a source image the user should take into account that the latent image will be better seen on a photocopy if the filling ratio stands in the range between 5 and 30 A greater value as a rule shows the latent image weakly visible or gives no effect at all When using source graphics from a file it is important to consider that the latent image as in the case with solid color will be visible only in areas where the filling ratio does not exceed 30 Source image
4. 229222922292229222922222 DEIETEIET S HER HRU NBR HAAR o HHHHNHHNHNHIE x R HR oo HHHHHHHHHHHH HII HH RH EHI a R HRR i BH E H RR Hi 8 ooo m mm Seen o 3 i Huhn BHBHBHBHBHBEHE E ooo HEHHHHHHHHHHHHHHHH HEBHBHBHBBEBEBHSEHHBHE E 3333122132113122 13521 21221231222122 MALDEN HR HII BND uR NENNNNNERER HON o H ppm a Fe q ooo B HHHHHH BB H HHHELO zm HERE 3 MHHI g HH ER E HH HHHHHHHHHHHHHH HEHHHHHHHHEHHH 2221222222221212212121221212 2 1 1 212 B2 2 313112213212 2122 213122 13 22223 22225 BETEIEIEI 3133 15112234 1222 H 12 H1 3414 HHHHHHHH a Fer d 5 2 HH HEHIHIIH ges TH DU NN 35 a o o E Zz tc to EC I Iu aj H bogs Fe TE S414 9 1NEJ Q S114 9 1NEJ Q 15114 inejeq 19414 9 nejeq 1s414 9 1 nejeq 15114 jnejeq 19414 9 nejeq 1s414 1j nejeq 15114 nejeg 19 BSS ANTICOPY 1 0 Index MOE Pr aa 11 Aspect LL 13 Pr a E 13 14 G OE 3 5 15 17 Default Halftone 14 15 17 18 19 Displacement 12 Ellipse 9 13 EP nen 3 15 16 FU 9 Expand ee 12 First Halftone 6 7 17 18 Frequency M mammas 11 Grayscale 5 15 17 MA eH 5 10 13 LAG 9 NE E P E 9 13 MOE RT 15 17 18 e os IH Immer een 9 PANG 13 Resolution 15 17 18 RGB meer rene 3 5 OA EAE 10 13 BSS ANTICOPY 1 0 BSS RNOMDOIQ EEE 9 13 Ro
5. BSS BSS ANTICOPY Version 1 0 BSS Contents Introduction ene eene IR memememet rn retemememetetvireretememe vtri re remisi ei riri re re reis 3 Pr paration of SoUree Im ga vvs 5 Making BStent IMACS a E INED RM ME 6 Micropaterns FIS ES veve 8 Modulation Paramel l E 11 Additional Parameters rarnnnnnnnnnnnnnnnnnnnnnnnnnnnnnannnnnnennnnnenennnnnnnnnnenennnnnnnnnnenennnnenennnenen 13 VEN Correction By NAS Nav 14 Output of Protected Image rrrrannnnnnnnnnnnnnnnnnnrnnnnnrnnnnnennnnnrnnannrnnansennansennassennussnnnnssennnnee 15 Calibration ssssssssssesesen en mm III nI Imm rI memet re metrttetetetretetrtretetrire metri rire retra re eias 16 Calibration Parameters ssessssssesenn mI III Im rR Rem retemet retirer retirer retra 16 ine qeTu B 20 BSS ANTICOPY 1 0 2 BSS Introduction This application has been developed to protect printed images from photocopying Xeroxing The protection algorithm is based on the use of special micropatterns rasters that are applied to process separate areas of the image to be protected As an initial data for processing they may take a solid background a Grayscale image or a color image in the RGB or CMYK formats The source image is processed in a way not altering the view brightness contrast ratio color hue of the printed copy in comparison with the source image a latent image being added In other words
6. box is opened by the command Calibration data is stored in the Calibrations directory The following commands are available in this dialog box Save Save calibration data in a file Load Load calibration data from a file for editing Clear Clear calibration data table Output of test Generate calibration test form in the EPS format for printing Close Exit the Calibration dialog box BSS ANTICOPY 1 0 16 BSS In the calibration process the following parameters are used 3 Calibration iBl x Save Load Clear Auto Output of test Close Properties T First Halftone Test samples Type of Calibration Destination From To Step Oo None Single Custom T Mode Grayzcale 2 EE a En E Resolution 600 dpi Table of gradation Second Halftone None v Comments Tiling Default Halftone Horizontal 210 E mm None Experimental data v Default amp First I Fa Default amp Second v Default amp First Second v Default amp First Default v Default amp Second Default First Halftone The first micropattern Second Halftone The second micropattern Default Halftone Default micropattern It is applied as reference for calibration Test samples sequence of test samples From level starting value To level final value Step step between values Type of Calibration Type of calibration single calibration usi
7. cropattern The second micropattern Samples for latent image are stored in the Watermarks directory in the form of grayscale graphic files in the TIFF format The user can add samples to the list by copying own images to the Watermarks directory The selected sample will be automatically reproduced as many times as necessary to cover all the protected area with the preset shift and size In the preview window the latent image is displayed with specified conditional colors The preview is available if latent image W view function is on TEST BSS ANTICOPY 1 0 BSS E Latent image is built up by application of various micropatterns the First Halftone micropattern corresponds to the black color the Second Halftone corresponding to the white one On the boundary between the two micropatterns the combination of both micropatterns is used The greater is the Boundary value the more blurry is the boundary between neighboring areas The first micropattern Maze1 The second micropattern Maze2 Result of two micropatterns application
8. f the protected image is turned at for example II BSS ANTICOPY 1 0 3 I00000000000000000000000000000 II0000000000000000000000000000 I0000000000000000000000000000 IO COCOS UD NNN SSSSSS200000011 n G a G an f aa far pa meer TI TN 1000 TTI Jul ii TUTTE 00000000000 VUE I0000 OUT TTT nnnnnnnnnnnnnnnnnnnnnnnnnnnnnr BSS EH 3 As a rule the resolution of copying machines is rather low This fact gives life to the method applying rasters with different ruling as well as combinations of fields containing large and small elements In this case the copying machine will successfully reproduce large elements failing to correctly reproduce small ones RE uu 4 he next protection method is based on a deficiency of all copiers they are not capable to correctly reproduce halftones A part of the image is then rendered with thin solid lines another part being rendered with halftone wider lines All the methods enumerated above except for the last one are applicable in traditional offset printing For digital printing all the methods are good apart from the third one due to low resolution of printer In practice all the methods described above require preliminary calibration of the printing process That is conditioned by the fact that the use of different rasters leads to differences of halftones
9. g process This operation is indispensable to make the latent image inserted with various micropatterns invisible on the original document Each combination of micropatterns each resolution value of the printing unit each type of paper and colors used each combination of printing process parameters must be separately calibrated In other words the process of calibration samples printing must be similar to the protected original document printing Theoretically the calibration process should be done for all possible color color hues values as well as for micropatterns combinations However such an approach requires too much resource Therefore the application offers two methods of calibration process Calibration using a single color calibration using a table of gradation In the first instance only one color color hue is calibrated this method being useful for protection of solid backgrounds and allowing minimizing the quantity of test prints required The second method is necessary to protect graphic images grayscale and color ones In this instance the calibration is done within the full range of image density levels The table of gradation is based on reference points corresponding to different values of the density level The calibration accuracy is achieved by an important number of reference points The application determines intermediate values by means of interpolation Calibration Parameters The calibration dialog
10. n the view mode The masked area of the image is processed with the use of the Default Halftone micropattern An area of the source image is masked Transformation result east eee EISE ial a es KK a ee ee ee ox Qooooooooooeooned mm Vo A AA aa aa aan aa aa ma Sharp boundary Blurred boundary BSS ANTICOPY 1 0 14 Output of Protected Image BSS After prior operations and the calibration process termination one can proceed with the final stage of latent image implementation saving of the result in a file The export of the protected image is executed by the amp command The file can be saved in the EPS or TIFF format Once the file name is entered the progress bar will be displayed Progress The process can be aborted by closing the progress bar window Destination Resolution Mode 600 E dpi Grayscale Default H alftane Hone Export parameters Resolution dpi Mode Default Halftone Printing unit resolution It can be set manually or selected from the list 72 96 300 600 1000 1129 1200 12 0 1500 2400 2540 3000 3387 3600 Color model Bitmap Grayscale or CMYK Color Default micropattern The Resolution and Mode parameter values will depend on effective capabilities of the printing unit BSS ANTICOPY 1 0 15 BSS Calibration ouccessful implementation of copy protection requires preliminary calibration of the printin
11. ng a single color Table of gradation calibration using a table of gradation Destination Printing unit parameters Mode color model Bitmap Grayscale or CMYK Color Resolution resolution of the printing unit Comments Additional information Experimental data Table containing experimental data Table category depends on type of calibration and color model of the output device Tiling Tiling print Parts of the table of calibration will be saved in separate files Horizontal The maximum size of a separate area in terms of height indicated in millimeters The following micropattern combinations are available Default amp First Default amp Second Default amp First Second Default amp First Default Default amp Second Default BSS ANTICOPY 1 0 17 BSS An example of calibration form is indicated below In the upper part the information is displayed related to parameters of micropatterns applied and service data In the left part it is shown for which micropatterns combinations the test samples are delivered In the right part there are values of the level in calibration Each testing field represents a Square bearing a circle in its center The square contains the Default Halftone micropattern used as a reference In the circle a test micropattern or a combination of micropatterns is located The figure by the side of each testing field indicates the correcting quantity Name Freq Angle Wave Softnes
12. s Expand Shape More Name Test 1 First Maze1 30 0 0 90 0 Maze 0 Date 03 01 2008 0 0 Second Maze2 30 0 90 170 Maze 0 Mode Grayscale Resolution 300 dpi Default Round1 50 45 0 0 Round Once the calibration form is printed the samples are selected having the same integral density The similarity can be defined visually the circle on the sample should not be visible If all the circles on the samples are brighter or darker than the background another wider calibration range should be selected In the event that both bright and dark circles are present on the sample none of the circles coinciding with the background the calibration range should be contracted by choosing the closest convenient value as a starting value The finally defined values are entered into the respective fields of the table Then the calibration data is saved into a file stored in the Calibrations directory and becomes available for use at the output of an image to be protected Calibration Samples 1 It should be taken into consideration that when selecting calibration data from the list the Resolution and Mode output parameters are altered together with the First Halftone Second Halftone and Default Halftone parameters All the parameters enumerated above are set by reference to the calibration data obtained BSS ANTICOPY 1 0 18 forms
13. s raster distortion Wave 0 90 100 MN lll BSS ANTICOPY 1 0 11 BSS softness value from 0 to 255 sets the blur level of micropattern elements boundaries It gives better reproduction even if printing unit resolution is rather low It is important to note that this parameter should be used only with printing units capable to reproduce halftones for instance with digital printing machines For units capable to reproduce binary black and white images only for example for traditional offset printing this value should be set to zero Softness 0 127 255 Expand value from 0 to 255 sets expansion of micropattern elements If set to zero dark elements are rendered at 100 level plate With the expansion value growth the printed components surface increases and the fill area reduces At the maximum value 255 the micropattern transforms into a solid background This parameter may be used on printing units capable to reproduce halftones Expand 0 127 255 Two following parameters are used together Split value from 1 to 16 indicates the quantity of parts the basic micropattern will be split to Particularly a line can be split into narrower lines Displacement value in the range between 0 and 255 sets the rate of expansion of split micropattern elements At the maximum value 255 new elements are positioned uniformly and at the zero level they run back together The use of the parameters described above is j
14. und 9 Second Halftone 6 7 17 19 SOIL IB SS ec rb besws 11 12 vl m 12 LS 16 VIZ LE NR RE 9 DER 3 5 6 15 WAVE M 11 Integral density 3 18 Interpolation 16 OOLITC MAS 3 D Calibration 4 15 16 17 18 19 SR EE EEE 14 Micropattern 3 6 7 8 9 10 12 15 17 18 Modulation 11 13 Moire pattern 3 Image density ssssssss 16 Latent image 3 6 8 15 Solid background 3 5 12 Color image eeesseses 3 10 EDON E cm 15 20
15. upload from the file is only available in the Image mode It can be accessed using the l command The source image can be presented in the following color models Grayscale halftone gray image RGB color image 3 channels 8 bits per channel CMYK color image 4 channels 8 bits per channel For color images it seems preferable to use the CMYK model as it allows avoiding conversion of models If Pantone is intended to be used in printing the source image may be converted into Grayscale All the graphic images should be submitted in the TIFF format no compression Graphic files resolution is chosen using the requirements for traditional printing 200 dpi at least BSS ANTICOPY 1 0 5 Making Latent Image BSS To build up a latent image it is necessary to select a sample from the list to determine its position its size and the boundary between areas with different micropatterns rasters Watermark Sample TEST TEST m Offset fes Offset y 06 Size 186 Eoundaw 03 First Haltone Mazel E M Second Haltone Maze2 h m Parameters Sample Offset X Offset Y Size Boundary First Halftone Second Halftone Latent image sample Position of the latent image in the X coordinate in millimeters Position of the latent image in the Y coordinate in millimeters Relative size of the latent image Boundary between areas with different micropatterns The first mi
16. ustified on high resolution printing units only 2400 dpi and higher Split 1 2 3 Displacement 127 255 BSS ANTICOPY 1 0 12 BSS Additional Parameters In addition to main modulation parameters there are some additional parameters specific for several types of micropatterns Mac oi Additional Parameter Examples Ellipse Aspect sets the ellipsis shape Rhomboid Aspect sets the rhombus shape N initiates PRNG Road N initiates PRNG y 0 SR FN DDO Image Patterns name of the file containing micropattern Files are stored in the Patterns directory and are editable by user Blur supplementary blurring of the source image to improve halftone reproduction BSS ANTICOPY 1 0 13 ss esse So 71 oo Oi 100000 L ities 99900 x 4 DOO 5 00000000 00000000 BSS Using Correction by Masking In some cases it is necessary to apply latent image to several areas of the source image only This can be done by means of masking The user can apply a mask using one of four tools ellipsis rectangle lasso and polygon e Mask display mode is switched on with the M command The following modifiers are available Shift add mask Alt subtract mask Shift Alt scissor mask When the source image size is altered the mask is cleared Masking Mask parameters Blur 35 4 Color celow Blur Mask boundary blurring at drawing Color Color to display the mask i
17. wWAWA WA wWAWAW WW Ww Ww Ww 7 e x Ss S RSS SKK KIN e e e P e eut 9 gt C L DEE DE DE DE DE s 9 ped raster dot Ww Ww wW v WV Ww Ww S NN x x Ww WA AN x Ww Ww x AN KV r hN r x AN a hN x x x x x v wa BW BW NE a r LT x LY x x x x x Maze maze shaped micropattern 5 He ee eeo S SO SON SS SON ON SN SN ON SN SUN ODO SON ON S NN ONSE OQ OO S SX SN SON SN SON SN SON SON SN SON SON SX SN SX SN SN SN S NS AS NS NS SED 9 90 0 0 0 0 9 0 9 90 9 9 9 0 9 0 9 0 9 0 9 O O O 9 0 0 0 0 C BSS ANTICOPY 1 0 QNOD N O agenta To BSS ANTICOPY 1 0 DN amp S 88 Modulation Parameters For all types of micropatterns the following parameters are available Frequency lines per inch sets raster spatial frequency ruling The greater is the value the smaller are micropattern elements This parameter value should be selected with a glance to printing unit resolution Frequency 10 20 30 Angle in degrees sets the angle of micropattern rotation For color images it is recommended to select angles that don t lead to appearance of moire pattern at printing Angle 0 45 x I SS Wave value from 100 to 100 set
18. will be generated for lon It the calibrati ing uni If calibration is done for a color print tance one of the letters C IS INS each color component and saved in separate files In th M Y or K is added to file name Test 1 OL ueAD Og ueAD OF ueAD Op ue o OG ueAD 09 ueAD OL ueAD 0g ueAD BERRE RHEDUHHSDEDHHESDURHER pu Ju nous 0 n ee du ane qu t HUNT BUHUN RRE PEPEEI ge Bangga 20 11212121212222222221212222222121202122222222 DHDDBDDDDODDODODDDDODOUODSS RHHHHHHHHHHHHHHH BHHHHHBBHBBHBHRHEBHEHH 5 p F EH HE HH HEHH DAR o8 RRR BOR o 5 313112 153122 25 2 223112 21521222422 BOR LE pur ays HHHUHHHHHHHHIHH BBBHBEHBEBBESEHSEHSEHES E gt 2 121222221 22 1212 2212221 P223 nnnnmmmnnmmmnmmmmmm oss 39322808 32300 PEPPE 382 up EEEE HE npn 5 amp 3 8 up Zaza nae 3 E i 131 153122 DESEDIEIEIET HERA HUN HUHBBHUBHBOHDHUHEOHUEH HORDE HHEBHEHEBHBBHBBEBHBHHE 2121222222121222212 21 2222 Dr nnnnnnnnnnnnnnnnnnn p EE s Gs z 292 H o E d E 2885 ina c o SEHEBEERERI H BES Sie HHHHHHEHEHHHHHEHH HAE o 2222221212222121222212121121 21 211 DEI ET 3222922292
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