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

Latest Forum Discussions

See All

COSMOS RINGS (Games)
COSMOS RINGS 1.0.0 Device: iOS iPhone Category: Games Price: $5.99, Version: 1.0.0 (iTunes) Description: This game cannot be played without the Apple Watch.Released anniversary sale until August 31,2016 PST! A tragic tale of time's... | Read more »
Human Anatomy Atlas 2017 Edition - Compl...
Human Anatomy Atlas 2017 Edition - Complete 3D Human Body 1.0.24 Device: iOS iPhone Category: Medical Price: $24.99, Version: 1.0.24 (iTunes) Description: | Read more »
Heroes of Normandie (Games)
Heroes of Normandie 1.5 Device: iOS Universal Category: Games Price: $14.99, Version: 1.5 (iTunes) Description: The game does not support iPhone 4s and below | Read more »
Why you should never power up Pokemon in...
There's no question that candy is dandy in Pokemon GO. You need big quantities of it to evolve your Pokemon, and when combined with stardust, it can be used to power up your favorite pocket monsters as well, making them more formidable for the gym... | Read more »
Webzen launches 3D MMORPG MU Origin on i...
Mu Origin is featured time and time again at the very top of App Stores in China, and within the top five worldwide top-grossing charts on Google Play.Its popularity in Korea and China, featuring more than 120 registered players in China and 6... | Read more »
Severed (Games)
Severed 1.0 Device: iOS Universal Category: Games Price: $5.99, Version: 1.0 (iTunes) Description: LAUNCH DISCOUNT ON NOW!! ENDS AUGUST 4! ==== Take control of a one-armed warrior named Sasha, wielding a living sword on her journey... | Read more »
CSR Racing 2: How to master Live Races
Getting better at racing the AI in CSR Racing 2 is a pretty straightforward process. You run enough races with a particular car to get its shift timing down, continually improve it by buying upgrades whenever you can, and add any fusion parts you... | Read more »
VisualRuler - turns your iPhone into rul...
VisualRuler - turns your iPhone into ruler 1.0 Device: iOS iPhone Category: Utilities Price: $2.99, Version: 1.0 (iTunes) Description: Need to measure the size of the object but do not have a ruler? VisualRuler calculates the size of... | Read more »
Blyss (Games)
Blyss 2.0 Device: iOS Universal Category: Games Price: $1.99, Version: 2.0 (iTunes) Description: Travel through Beautiful mountains, serene valleys and harsh deserts solving Blyss' unique and self-evolving puzzles. The endless... | Read more »
Road Not Taken (Games)
Road Not Taken 1.0 Device: iOS iPhone Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: "It looks like a cute fairy tale, but this is a turn-based game that's thorny with challenge and packed with an incredible number... | Read more »

Price Scanner via MacPrices.net

Notebook Makers In No Rush To Adopt USB-C – R...
Digitimes’ Cage Chao and Joseph Tsai note that while the USB Type-C interface is enjoying growing popularity among smartphones and tablet makers, notebook and all-in-one (AIO) PC vendors (other than... Read more
iMacs on sale for up to $250 off MSRP
B&H Photo has 21″ and 27″ Apple iMacs on sale for up to $250 off MSRP including free shipping plus NY sales tax only: - 27″ 3.3GHz iMac 5K: $2049 $250 off MSRP - 27″ 3.2GHz/1TB Fusion iMac 5K: $... Read more
12-inch 1.1GHz Retina MacBooks on sale for up...
Amazon has 2016 12″ 1.1GHz/256GB Retina MacBooks on sale for up to $100 off MSRP including free shipping: - 12″ 1.1GHz Space Gray Retina MacBook: $1199 $100 off MSRP - 12″ 1.1GHz Silver Retina... Read more
Bare Bones Software Releases Free TextWrangle...
Bare Bones Software has announced the release and immediate availability of TextWrangler 5.5, a significant update to its powerful, free, general purpose text editor for Mac OS X. TextWrangler is a... Read more
Apple’s 2016 Back to School promotion: Free B...
Purchase a new Mac or iPad using Apple’s Education Store and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free, and... Read more
Apple refurbished iPad Air 2s available start...
Apple has Certified Refurbished iPad Air 2 available starting at $339. Apple’s one-year warranty is included with each model, and shipping is free: - 128GB Wi-Fi iPad Air 2: $499 - 64GB Wi-Fi iPad... Read more
13-inch 2.5GHz MacBook Pro available for $964...
Overstock has the 13″ 2.5GHz MacBook Pro available for $964.21 including free shipping. Their price is $135 off MSRP. Read more
External Keyboard Innovations For iPad Pro (1...
I’m an input device aficionado. With non-touchscreen computers, which includes all Macs, the keyboard and mouse or trackpad are the tactile points of interface between user and machine, and the... Read more
GSK Rheumatoid Arthritis Study Leverages iPho...
Global healthcare products company GlaxoSmithKline (GSK) says that since 2014 they have begun transforming the way they conduct research, by leveraging state-of-the-art digital technologies — a... Read more
Clearance 12-inch Retina MacBooks, Apple refu...
Apple has Certified Refurbished 2015 12″ Retina MacBooks available starting at $929. Apple will include a standard one-year warranty with each MacBook, and shipping is free. The following... Read more

Jobs Board

*Apple* Solutions Consultant - APPLE (United...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
Lead *Apple* Solutions Consultant - APPLE (...
Job Summary The Lead ASC is an Apple employee who serves as the Apple business manager and influencer across a number of Reseller locations. The Lead ASC's role Read more
*Apple* Retail - Multiple Positions, Charles...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Retail - Multiple Positions, Willow...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Evangelist - JAMF Software (United S...
The Apple Evangelist is responsible for building and cultivating strategic relationships with Apple 's small and mid-market business development field teams. This Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.