quickstart guide to screening using series 3 (24k pdf)
Contents
1. August 1998 Andromeda Series Filters Series 3 Screens Filter for Gray Scale Images QUICKSTART Print this tutorial open the Quickstart image Masks in Photoshop and then open the Series 3 Screens Demo Filter by choosing Screens Demo from the Andromeda sub menu in the Filter menu Follow the tutorial for a quick hands on insight into Series 3 Screens INTRODUCTION TO SCREENING A continuous tone gray scale image such as a B amp W photograph must be prepared for printing by reducing the tonal image to two values black and white This must be done since black ink is used to print on white paper The process is known as screening the photograph to make a halftone for printing The screening process essentially simulates shades of gray in a photograph by converting them to various sizes of black dots When the dots are large we see black very small dots or no dots are seen as white gray shades are made by dots whose sizes increase as the degree of darkness increases The dot itself can be of various shapes i e round elliptical diamond straight line and mezzotint The quality of a screened image is dependent upon line screen specified in lines per inch lpi The Ipi is related to the resolution of your output device and represents the quality of halftone dots that can be made For instance a 300 dpi laserprinter screens at 53 Ipi Higher screens produce a better technical simulation of2. e button to select that screen The Right Preview Window will show the output screened image Zoom and Pan at 1 1 to see the actual screening quality Step 2 Experiment with contrast by clicking in the More and Less Variations window You are changing the Threshold setting Less will open up shadow areas More will fill highlight areas with screening Since this changes the entire image observe the effects on other parts of the image by moving the Thumbnail Box in the Preview Window Step 3 Click on OK to screen the image Since this is a demo version of the filter the OK button has been disabled Step 4 In Photoshop change Mode to Bitmap 50 Threshold Option YOU ARE DONE Step 5 Repeat Step 1 but choose different Presets in the pull down menu each time Zoom and Pan at 1 1 to see the actual screening quality Use the DEFAULT button to refresh the Filter settings to default values Use the CANCEL button to return control to Photoshop Expert Mode Overview Click on the Expert button in Novice Mode You are now in Expert Mode Use this mode to customize a Novice Mode Preset or to explore new settings and optionally Save your custom preset in the Preset menu See User Manual In Expert Mode the Left and Right Preview Windows and Variations Windows remain in the same locations Several functional windows segregated by a border around each are presented To use the Series 3 Screens Filter in Expert Mode foll
3. ened output from Series 3 should not be scaled 7 If you are experimenting with the filter we suggest you work with a 600 dpi gray scale input photo Applying the 4 1 rule this allows a range of 10 to 150 Ipi output screening resolution for experimentation It also allows spectacular camera ready proofs on your 600 dpi desktop laser printer END
4. ow 6 steps 1 Selection of the Screen Mezzo Pattern Blend Difference 2 Optional selection of Enhance Photo 3 Adjustment of Output Image Options 5 Clicking on OK to screen the image 6 In Photoshop changing of Mode to Bitmap 50 Threshold Option THE 4 1 RULE AND OTHER TIPS FOR GOOD SCREENING 1 Before starting know the lines per inch Ipi screen ruling or screening resolution required to print your image Ask your printer 2 Start with Input Photo resolution that is at least 4 times the lpi required for printing your image 4 1 Rule For example if your image is to be printed at 65 Ipi then start with a grayscale image that is at least 65 X 4 260 dots per inch If the resolution is higher then 4 times lpi you will get even better detail as long as your output recorder can output at that resolution However if it is lower the screening ce will be poor since screen pattern will appear pixelated If your input image does not meet the 4 1 rule consider using Image Size command in Photoshop to increase resolution by interpolation or better yet get a higher resolution scan 3 When using Series 3 Screens remember to select Lines Per Inch or Ipi in Novice Mode or Exert Mode consistent with Rule 2 above 4 Preview the screened output in the Preview Window at 1 1 5 After an image is screened in Photoshop change the Mode to Bit Map with 50 Threshold for a significantly smaller file size 6 The scre
5. representing shades of gray in a black ink on white paper printing environment Using Series 3 Screens you can select a special effect screen such as a mezzotint mezzogram or a mezzoblend and screen your gray scale image to a richly textured image Series 3 is the first true desktop solution for special effect screening e High quality low cost alternative to the traditional photographic process e Dramatically reduced file sizes since images become line art or bitmaps e You can produce camera ready output on 600dpi printers e Illustrative amp textured look can be added to a continuous tone photograph to make it look like a work of art e Alternative to conventional halftoning with added contrast and sharpness in detail for advertising SERIES 3 USER INTERFACE Open the sample image Masks in Photoshop and then open the Screens Filter User Interface by choosing Screens from the Andromeda sub menu in the Filter menu Series 3 Screens Filter opens in Novice Mode Novice Mode Overview e Move the cursor across the various sections of the Novice Mode User Interface screen to trigger a dynamic Helper Box with information for each section e Preview Windows The two larger windows on the top show the input image left window and resulting screened output right window e Sync Button Click to synchronize the movement of the two Preview windows e Zoom and Pan The cursor changes to a magnifying glass over the Previe
6. w windows Zoom In at 1 1 see lower right corner of each window for magnification status 3 indicates 1 3 3 indicates 3 1 and so on Hold down the Option key and click to Zoom Out To Pan around the image use Scroll arrows when they appear in the large Preview Windows e Four Variations Windows By clicking on More or Less windows you can lighten or darken the entire output image by varying the Threshold These windows show a part of the Preview image To see another part re position a Thumbnail Box visible in any of the two larger Preview Windows hold down the Command Key click down and drag the Thumbnail Box to its new position in the image drop it by releasing the mouse button Original More Current Less windows will show the new selected part of the image SCREENING A GRAY SCALE IMAGE This is easily done in Novice Mode by using a preset Presets are ready to use screens that are factory installed in Presets menu in Novice Mode Preset screens can create photographic quality mezzotints mezzograms sharpened mezzotints mezzoblends pattern screens and special effect screens at a click of a button Note For best screening results you must read 4 1 Rule and Other Tips For Good Screening at the end of this Quickstart tutorial Step 1 Click on the Preset menu and drag down to Mezzotints Continue dragging to Mons the right until Mezzotint 75 is highlighted then release the mous
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