Príprava dát s bielou na tlačový stroj

Transcription

1 Príprava dát s bielou na tlačový stroj Táto príručka popisuje postup, ktorý sa odporúča na prípravu korektných dát na tlač bielou farbou na tlačovom stroji Durst. Vysvetľuje ako pripraviť súbory (vektorový aj rastrový) dáta možno pripraviť 2 spôsobmi: A) Photoshop channel B) Spot color processing Pri celoplošnom pokrytí bielej nie je potrebné dáta nijako upravovať! Treba túto informáciu iba podať pri zadávaní zákazky.

2 A) Photoshop channel Otvorte obrázok vo Photoshope (CMYK alebo RGB). Na definovanie bielej farby použite nový Channel, ktorý môže byť Alpha-channel, alebo Spot channel. Pozor nezamente si pojem Channel a Layer. Extra or alpha channels Vo Photoshope si otvorte záložku Channels (Window - Channels) a Preparing vytvorte the New image Channel,alebo New Spot Channel (obr.1) obr. 1 First, open your image in Photoshop (which we will take as example here); it can be either a CMYK or a RGB file. All you have to do is create an additional channel (this is not to be confused with an additional Layer), either an Alpha-channel or a Spot channel, as it is called in Photoshop, and save in TIFF. To do that, there are basically two methods: either create the channel from scratch, or use the selection. We will review both methods here. a) Creating the channel from Scratch First, open the Channels tab (Window>Channels), then click the New Channel button (on the bottom right corner of the tab). This will create a new channel called Alpha 1. Now reenable the CMYK (or RGB) channel display (otherwise, you will not see your image in the background), and finally, double-click the Alpha 1 icon (left of the name) to review V the Channel channel properties. Options (viď obr. 2) máte možnosť zmeniť Name, Color Indicates a Color obr. 2 The only thing you should check here is that the type is either Selected Areas or Spot Name Channel, but not Masked Areas. Other than that, you can, if you want, change the pokiaľ color (the budete default používať is Red), change ako the výstupný opacity, súbor change z Photoshopu the name White. TIFF, nie However, je potrebné špecificky pomenovať all of this will názov only affect kanála. the preview in Photoshop, not the content of the TIFF file that you will finally generate. Even the name is not important, because in a TIFF file, neither Color the channel Indicates name nor the color values can be saved. Therefore, whatever you decide to použite do, you will Selected have to re-associate Areas alebo the Spot channel Colors, to the White nie Masked ink in your Areas Caldera software. Once you have set up the properties, close this window. Now paint anything you want in Color this channel copy and paste a selection into it, add some text, etc. In this channel, the môžete zmeniť farbu a opacitu. Táto voľba neovplyvní výslednú farbu v súbore jedná sa iba o 0% value represents no white, and 100% represents 100% of white. Please note that if náhľad farby vo Photoshope. you disable the view of the background image (i.e. if you view the spot channel alone), 11/12/2007 Caldera Super7 GrandWhite User Guide Page 6

3 Ak chcete pracovať s kanálom musí byť označený! Teraz môžete do spot kanála vložiť text alebo nakresliť grafiku. V alpha kanále 0% hodnota farby predstavuje 0% bielej a 100% hodnota farby 100% biele then, visually, 0% will appear as white, and 100% as black that would be exactly the Pozor nenechajte sa pomýliť rôznym zobrazením kanálu. opposite of what you want. However, this is not a problem: only the densities matter here. then, visually, 0% will appear as white, and 100% as black that would be exactly the Na opposite Here obr. is a 3 of first je what vidieť snapshot you aktívne want. of our However, sample zobrazenie file, this with is CMYK not the a problem: White kanálov only channel bez the aplha disabled: densities kanála matter here. obr. 3 Here is a first snapshot of our sample file, with the White channel disabled: The same snapshot, showing the White channel only (CMYK disabled): Na obr. 4 je vidieť aktívne zobrazenie alpha kanála bez CMYK kanálov The same snapshot, showing the White channel only (CMYK disabled): obr. 4 And finally, a snapshot showing the composition of all channels (with the White color set as red for clarity purposes): And finally, a snapshot showing the composition of all channels (with the White color set as red for clarity purposes): 11/12/2007 Caldera Super7 GrandWhite User Guide Page 7 11/12/2007 Caldera Super7 GrandWhite User Guide Page 7

4 Na obr. 5 je vidieť aktívne zobrazenie Alpha kanála a CMYK kanálov obr. 5 b) Creating the White channel from a selection. b) Ak Creating chcete the vytvoriť White channel nový kanál from zo selection. selekcie časti vo vašom obrázku či už napr. za pomoci Magic The second Wand, method Quick consists Mask in (tieto selecting miesta some musia areas in byť your samozrejme image with the tie magic ktoré wand The second method consists in selecting some areas in your image with the magic wand chcete vyplniť bielou) Najprv or with otvorte the Quick obrázok. Mask (these otvorte areas záložku must be, or with the Quick Mask (these areas must be, channels of course, of course, (Window the ones the ones you - you Channels) want to fill with want to fill with white), Vytvorte white), then then selekciu copy the copy the potom selection selection kliknite into a into na new new tlačidlo channel. channel. uložiť To do To do Save that, first that, first selection draw your draw your as selection, channel selection, (obr.6). Vytvorí sa then nový then just just Channel click the click the s názvom button Save button Save Alpha selection selection 1 a as as dvojkliknutím channel in the channel in the na Channel Channel tento Channel tab. Again, tab. Again, vyvoláte this will this will možnosti create a new channel called Alpha 1, and here as well, you should immediately doubleclick the channel to check its properties. create new channel called Alpha 1, and here as well, you should immediately doubleclick obr. 6the channel to check its properties. If the type is Masked Areas, change it to Selected Areas. Do not immediately change If the type is Masked Areas, change it to Selected Areas. Do not immediately change Ak it to je Spot Color Color, Indicates or the v selection možnostiach will be zvolený inverted ako (i.e. the Masked non-selected area zmeňte areas will ho be it to Spot Color, or the selection will be inverted (i.e. the non-selected areas will be na Selected area. Ak filled chcete with white). použiť If Color you absolutely Indicates want ako Spot to have filled with white). If you absolutely want to have channel a spot spot nepoužite channel, validate channel, validate túto možnosť once with once with ihneď po vytvorení Selected kanála, Selected Areas, pretože Areas, close close sa the the selekcia window, window, invertne then reopen then reopen čiže it it bude and finally and finally negatívna. change change Ak to Spot to Spot trváte Color. Color. na použití Spot Channel Options dvojklikom a zmeniť Color Indicates na Spot color. Samozrejme po konverzii môžete stále editovať Channel napr. pridávaním textu. 11/12/2007 Caldera Super7 GrandWhite User Guide Page 8 11/12/2007 Caldera Super7 GrandWhite User Guide Page 8

5 Uloženie súboru: Ak ste ukončili naplnenie kanálu s požadovanými dátami uložte váš súbor ako TIFF. Ponechajte pri ukladaní povolené (Spot Colors a/alebo Alpha channels) a nezabudnite vypnúť LZW kompresiu. Alternatívne môžete použiť aj formát Photoshop PDF. V tomto prípade musí byť Channel definovaný ako Please Spot note Channel that you (Spot do not channel), have, and inak probably bude ignorovaný do not want, pri to overprint ripovaní. everything. Názov kanálu For musí byť pomenovaný instance, na white White text a can všetky knockout hodnoty the image farby (although musia byť it is navolené not the case na in 0%. the example below). EPS formát nemôžete použiť pretože neumožňuje uložiť alpha kanály. As for the color components of the White, you absolutely do not have to set them all at 0%. Exactly as in the case of contour filling, it will be of no importance when it comes to B) Použitie the final print, priamej since these values (Spot) are normally farby only (vektor) used for previewing purposes. However, setting them all at 0% has a little advantage: if you do something else with this document (print it on a desktop printer, view it with a PDF reader, etc.), then the result príprava has a dát fair chance of being correct, because if the rasterizer tries to flatten all the white objects, and if all of them overprint, then the background image will be unchanged. From Otvorte súbor a certain vo point vektorovom of view, a programe true White (na spot ukážku color tends bude to be použitý transparent Adobe for Illustrator) rasterization processes that do not have a white ink 9. This is not the case if you assign an artificial color to the White (e.g. a Red). A few notes about the creation of objects: Pri tvorbe grafiky dodržujte nasledovné pokyny 1. Both Stroke and Fill colors must be set as White, and both must have the 1. Nastavte Fill, overprint Stroke na attribute farbu (if definovanú needed). ako Spot Color s názvom White s nastavením farby na 0% Na výplň aj ťah musí byť aplikovaný overprint (ak je potrebný) 2. It is possible to adjust the white density individually for all objects. Besides, this 2. Je možné nastavovať is the main advantage percentá of Spot the Color method, na compared každý objekt to contour jednotlivo filling. či už ťahu (Stroke) alebo výplne (Fill) 3. You can create gradients containing white, but these gradients must not contain any other color save for the white, otherwise the RIP will not rasterize the 3. Možete vytvoriť prechod (gradient) obsahujúci bielu, Ale prechod nesmie obsahovať žiadnu inú gradient at all. In our example, we have created a radial gradient between White farbu. and No color (which Illustrator cannot preview). 4. Môžete importovať Duotone (Photoshop) rastrové obrázky alebo greyscale do vášho dokumentu (prinajmenšom v Illustratore) a navoliť ich ako White 9 Unfortunately, this is not the case in the Caldera software: if you print the document on a printer which does not have a white ink, the white will knock out the image data. This is currently a bug involving the Spot+Overprints combination.

6 5. Nepoužívajte transparenciu, predovšetkým pre White objekty. Doporučujeme nepoužiť trasparenciu v celom dokumente ak je to možné, hlavne ak je výstupný súbor PDF. Uloženie súboru: Môžeme použit tlač cez Postscriptovú tlačiareň,pdf tlačiareň, uložiť súbor ako Illustrator EPS, alebo uložiť ako Illustrator PDF format. Ak používate PostScriptovú tlačiareň, vždy tlačte s nastavením separácií Composite a nie po separáciách Separation. Nikdy nezvoľte voľbu konvertovať priame farby na základné farby (Convert Spot Colors to Process Color), pokiaľ je táto voľba dostupná. Pri ukladaní vždy aktivujte Preserve overprint options.