TweetFollow Us on Twitter

Spring 91 - PRINT HINTS FROM LUKE & ZZ

PRINT HINTS FROM LUKE & ZZ

COLOR PRINTING WITH LASERWRITER 6.0 REVISITED

PETE "LUKE" ALEXANDER and Zz

[IMAGE Luke+Zz.gif]

Luke speaks

With the release of 32-Bit QuickDraw version 1.0, Apple wanted to find a way to support color printing on the high-end (albeit black-and-white) LaserWriter® II, as well as other, third-party devices. So, the great implementors (GIs) created a new LaserWriter driver--version 6.0. This driver added a new Color/Grayscale button to the print dialog, allowing users to print their "way cool" color pictures that were created with 32-Bit QuickDraw. All was happy in the land of Apple's new color model. But wait! There was a problem lurking on the horizon, a problem called the PostScript Offending Command Error.

Imagine this scenario: You've just created a cool 32-Bit QuickDraw picture, a true masterpiece, and all seems to be going well. You decide to print your picture and show it off to Mom. You choose Print from the File menu; the print dialog appears, and you click OK. A few minutes pass, and voilà: a printed page containing your picture. Life is gooood.

With this success, you're now dreaming of other pictures that you'll be able to create and print. You create another cool 32-bit picture. You choose Print from the File menu; the print dialog appears, and you click OK. A few minutes pass, and this time the PostScript Offending Command Error dialog appears, looking something like this:

Error: LimitCheck; Offending Command: 080AGOBBLEDEGOOK0B

What's this? An offending command? But all you wanted to do was print your color picture. You were able to print your first picture a few minutes ago. What's going on? Unfortunately, LaserWriter driver version 6.0 does not reliably print images that are deeper than 8 bits. We won't bore you with the details: just think of the LaserWriter driver as a shark, ready to swallow a surfer off the California coast. But instead of the surfer dude it was expecting, in rushes the surfer dude's surfboard. The LaserWriter driver chokes on deeper images just as our poor shark chokes on the surfboard; the driver is ready to receive a particular variable but occasionally receives something different, and doesn't know what to do with it. The result: the PostScript Offending Command Error. Life is no longer so good; your dreams are beginning to fade away. But I can see a solution appearing on the horizon . . .

Actually, there are three possible solutions: you can use LaserWriter driver version 6.1 (or version 7.0 when it's available); you can depth-convert your image from 32 bits to 8 bits using 32-Bit QuickDraw; or you can use the PostScript ® image operator to generate PostScript code for your image, and send it directly down to the LaserWriter. Let's look at each solution.

Using LaserWriter driver version 6.1 is the simplest solution. LaserWriter driver version 6.1 likes data of any depth, no matter when it's sent. So, if you're printing to LaserWriter driver version 6.1, life is happy when you're printing your 32-bit images--but how can you be sure that you're using LaserWriter driver version 6.1?You can call PrDrvrVers, which is provided by the Printing Manager to enable your application to determine which version of a particular printer driver you're talking to. But there's a minor problem with this call. You don't know if you're talking to a PostScript LaserWriter or some other device. So, you must dive into the bowels of the print record for additional information. You need to check the high byte of the wDev field of the TPrStl record to determine a particular driver and version. But wait! You thought checking wDev was evil. In this case, using wDev is OK because you're not checking for particular functionality of a driver, and thereby not making your code device dependent. If wDev is 3, you know that you're talking to a PostScript LaserWriter. Non-PostScript LaserWriters (for example, the LaserWriter IIsc) have a different value for the wDev field. You would then call PrDrvrVers to determine if you're talking to LaserWriter driver version 6.1. If PrDrvrVers returns 61, you know that you're using LaserWriter driver version 6.1, and life is good again. If wDev is 3, and the driver version is less than 61, you're not using LaserWriter driver version 6.1, so you have a little more work to do: try the next solution.

The next possible solution is to use 32-Bit QuickDraw to depth-convert your 32-bit image to 8 bits by using 32-Bit QuickDraw's GWorld support. You would first create an 8-bit GWorld containing a grayscale CLUT, and use CopyBits to copy your 32-bit image into it. You would then use CopyBits to copy the 8-bit image directly into the printer's grafPort, and voilà--your image would be printing. This approach works with LaserWriter driver version 6.0 and later.

Your final option is to use the PostScript image operator to generate PostScript code that represents your 32-bit image. This approach is a little more complex than the 32-Bit QuickDraw idea. To send your data down to the LaserWriter, you would need to use the PostScriptHandle PicComments with the image operator. If you're already sending PostScript code to the LaserWriter, this is probably the best approach.

By the way, if you don't have a copy of LaserWriter driver version 6.1, it's available on theDeveloper Essentials disc. If you want to ship this version of the driver with your application, you should contact Apple Software Licensing for the details.

In conclusion, we have some good news and some bad news. The good news is that we've fixed the 32-bit image printing problem that was present in LaserWriter driver versions 6.0, 6.0.1, and 6.0.2. LaserWriter driver version 6.1 will allow you to print pictures that are 1 bit to 32 bits deep without any problems. The bad news is that if you want your application to print all depths of pictures with LaserWriter driver version 6.0, you're going to need to do a little extra work, either depth- converting your pictures from 32 bits to 8 bits before print time, or using the PostScript image operator to generate PostScript code for your image. Now that's not so bad, is it?



PETE "LUKE" ALEXANDER spends much of his Developer Technical Support time diving deep into the bowels of the Printing Manager, where he never turns up his nose at a challenge or at odiferous code that needs explaining. Although that kind of diving is fun, he prefers the balmy blue waters of anyplace (preferably far from computers) that has both beach and beer close together. If he can't get away from it all on the beach somewhere, he'll settle for getting above it all in his glider; with Luke, being up in the air about something takes on a whole new meaning. Fortunately, not everything on the horizon is blue sky. Luke's looking forward to the cool new printing architecture that will make his job (and yours) a lot easier. He's preparing for this new architecture by spending a week sailing around the Caribbean--figuring that he'd better start getting used to a life of leisure. Until that leisure can become a lifestyle, you can count on seeing lots from Luke. *

For details regarding the use of the PostScriptHandle PicComments, take a look at Technical Note #91, Optimizing for the LaserWriter--PicComments. *

For details about depth-converting your 32-bit images or using the PostScript image operator, see Technical Note #72, Color Printing. *

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Hopper Disassembler 4.3.0- - Binary disa...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32- and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about its... Read more
GraphicConverter 10.5.1 - $39.95
GraphicConverter is an all-purpose image-editing program that can import 200 different graphic-based formats, edit the image, and export it to any of 80 available file formats. The high-end editing... Read more
Delicious Library 3.7 - Import, browse a...
Delicious Library allows you to import, browse, and share all your books, movies, music, and video games with Delicious Library. Run your very own library from your home or office using our... Read more
Duet 1.6.7.0 - Use your iPad as an exter...
Duet is the first app that allows you to use your iDevice as an extra display for your Mac using the Lightning or 30-pin cable. Note: This app requires a $14.99 iOS companion app. Version 1.6.7.0:... Read more
iExplorer 4.1.5 - View and transfer file...
iExplorer is an iPhone browser for Mac lets you view the files on your iOS device. By using a drag and drop interface, you can quickly copy files and folders between your Mac and your iPhone or... Read more
Alarm Clock Pro 10.3 - $19.95
Alarm Clock Pro isn't just an ordinary alarm clock. Use it to wake you up in the morning, send and compose e-mails, remind you of appointments, randomize the iTunes selection, control an internet... Read more
Tor Browser Bundle 7.0.7 - Anonymize Web...
The Tor Browser Bundle is an easy-to-use portable package of Tor, Vidalia, Torbutton, and a Firefox fork preconfigured to work together out of the box. It contains a modified copy of Firefox that... Read more
Data Rescue 5.0.1 - Powerful hard drive...
Data Rescue’s new and improved features let you scan, search, and recover your files faster than ever before. We have modernized the file-preview capabilities, added new files types to the recovery... Read more
Alfred 3.5.1 - Quick launcher for apps a...
Alfred is an award-winning productivity application for OS X. Alfred saves you time when you search for files online or on your Mac. Be more productive with hotkeys, keywords, and file actions at... Read more
Tunnelblick 3.7.3 - GUI for OpenVPN.
Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X. It provides easy control of OpenVPN client and/or server connections. It comes as a ready-to-use application with all... Read more

Wheels of Aurelia (Games)
Wheels of Aurelia 1.0.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.1 (iTunes) Description: | Read more »
Halcyon 6: Starbase Commander guide - ti...
Halcyon 6 is a well-loved indie RPG with stellar tactical combat and some pretty good writing, too. It's now landed on the App Store, so mobile fans, if you're itching for a good intergalactic adventure, here's your game. Being a strategy RPG, the... | Read more »
Game of Thrones: Conquest guide - how to...
Fans of base building games might be excited to know that yet another entry in the genre has materialized - Game of Thrones: Conquest. Yes, you can now join the many kingdoms of the famed book series, or create your own, as you try to conquer... | Read more »
Halcyon 6: Starbase Commander (Games)
Halcyon 6: Starbase Commander 1.4.2.0 Device: iOS Universal Category: Games Price: $6.99, Version: 1.4.2.0 (iTunes) Description: An epic space strategy RPG with base building, deep tactical combat, crew management, alien diplomacy,... | Read more »
Legacy of Discord celebrates its 1 year...
It’s been a thrilling first year for fans of Legacy of Discord, the stunning PvP dungeon-crawling ARPG from YOOZOO Games, and now it’s time to celebrate the game’s first anniversary. The developers are amping up the festivities with some exciting... | Read more »
3 reasons to play Thunder Armada - the n...
The bygone days of the Battleship board game might have past, but naval combat simulators still find an audience on mobile. Thunder Armada is Chinese developer Chyogames latest entry into the genre, drawing inspiration from the explosive exchanges... | Read more »
Experience a full 3D fantasy MMORPG, as...
Those hoping to sink their teeth into a meaty hack and slash RPG that encourages you to fight with others might want to check out EZFun’s new Eternity Guardians. Available to download for iOS and Android, Eternity Guardians is an MMORPG that lets... | Read more »
Warhammer Quest 2 (Games)
Warhammer Quest 2 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Dungeon adventures in the Warhammer World are back! | Read more »
4 of the best Halloween updates for mobi...
Halloween is certainly one of our favorite times for mobile game updates. Many popular titles celebrate this spooky season with fun festivities that can stretch from one week to even the whole month. As we draw closer and closer to Halloween, we'... | Read more »
Fire Rides guide - how to swing to succe...
It's another day, which means another Voodoo game has come to glue our hands to our mobile phones. Yes, it's been an especially prolific month for this particular mobile publisher, but we're certainly not complaining. Fire Rides is yet another... | Read more »

Price Scanner via MacPrices.net

Apple restocks full line of refurbished 13″ M...
Apple has restocked a full line of Apple Certified Refurbished 2017 13″ MacBook Pros for $200-$300 off MSRP. A standard Apple one-year warranty is included with each MacBook, and shipping is free.... Read more
13″ 3.1GHz/256GB MacBook Pro on sale for $167...
Amazon has the 2017 13″ 3.1GHz/256GB Space Gray MacBook Pro on sale today for $121 off MSRP including free shipping: – 13″ 3.1GHz/256GB Space Gray MacBook Pro (MPXV2LL/A): $1678 $121 off MSRP Keep an... Read more
13″ MacBook Pros on sale for up to $120 off M...
B&H Photo has 2017 13″ MacBook Pros in stock today and on sale for up to $120 off MSRP, each including free shipping plus NY & NJ sales tax only: – 13-inch 2.3GHz/128GB Space Gray MacBook... Read more
15″ MacBook Pros on sale for up to $200 off M...
B&H Photo has 15″ MacBook Pros on sale for up to $200 off MSRP. Shipping is free, and B&H charges sales tax in NY & NJ only: – 15″ 2.8GHz MacBook Pro Space Gray (MPTR2LL/A): $2249, $150... Read more
Roundup of Apple Certified Refurbished iMacs,...
Apple has a full line of Certified Refurbished 2017 21″ and 27″ iMacs available starting at $1019 and ranging up to $350 off original MSRP. Apple’s one-year warranty is standard, and shipping is free... Read more
Sale! 27″ 3.8GHz 5K iMac for $2098, save $201...
Amazon has the 27″ 3.8GHz 5K iMac (MNED2LL/A) on sale today for $2098 including free shipping. Their price is $201 off MSRP, and it’s the lowest price available for this model (Apple’s $1949... Read more
Sale! 10″ Apple WiFi iPad Pros for up to $100...
B&H Photo has 10.5″ WiFi iPad Pros in stock today and on sale for $50-$100 off MSRP. Each iPad includes free shipping, and B&H charges sales tax in NY & NJ only: – 10.5″ 64GB iPad Pro: $... Read more
Apple iMacs on sale for up to $130 off MSRP w...
B&H Photo has 21-inch and 27-inch iMacs in stock and on sale for up to $130 off MSRP including free shipping. B&H charges sales tax in NY & NJ only: – 27″ 3.8GHz iMac (MNED2LL/A): $2179 $... Read more
2017 3.5GHz 6-Core Mac Pro on sale for $2799,...
B&H Photo has the 2017 3.5GHz 6-Core Mac Pro (MD878LL/A) on sale today for $2799 including free shipping plus NY & NJ sales tax only . Their price is $200 off MSRP. Read more
12″ 1.2GHz Space Gray MacBook on sale for $11...
Amazon has the 2017 12″ 1.2GHz Space Gray Retina MacBook on sale for $100 off MSRP. Shipping is free: 12″ 1.2GHz Space Gray MacBook: $1199.99 $100 off MSRP Read more

Jobs Board

Product Manager - *Apple* Pay on the *Appl...
Job Summary Apple is looking for a talented product manager to drive the expansion of Apple Pay on the Apple Online Store. This position includes a unique Read more
*Apple* Retail - Multiple Positions - Farmin...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Frameworks Engineer, *Apple* Watch - Apple...
Job Summary Join the team that is shaping the future of software development for Apple Watch! As a software engineer on the Apple Watch Frameworks team you will Read more
*Apple* News Product Marketing Mgr., Publish...
Job Summary The Apple News Product Marketing Manager will work closely with a cross-functional group to assist in defining and marketing new features and services. Read more
Fraud Analyst, *Apple* Advertising Platform...
Job Summary Apple Ad Platforms has an opportunity to redefine advertising on mobile devices. Apple reaches hundreds of millions of iPhone, iPod touch, and iPad Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.