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. *

 
AAPL
$104.88
Apple Inc.
+1.89
MSFT
$44.77
Microsoft Corpora
+0.39
GOOG
$544.90
Google Inc.
+12.19

MacTech Search:
Community Search:

Software Updates via MacUpdate

Art Text 2.4.8 - Create high quality hea...
Art Text is an OS X application for creating high quality textual graphics, headings, logos, icons, Web site elements, and buttons. Thanks to multi-layer support, creating complex graphics is no... Read more
Live Interior 3D Pro 2.9.6 - Powerful an...
Live Interior 3D Pro is a powerful yet very intuitive interior designing application. View Video Tutorials It has every feature of Live Interior 3D Standard, plus some exclusive ones: Create multi... Read more
The Hit List 1.1.7 - Advanced reminder a...
The Hit List manages the daily chaos of your modern life. It's easy to learn - it's as easy as making lists. And it's powerful enough to let you plan, then forget, then act when the time is right.... Read more
jAlbum Pro 12.2.4 - Organize your digita...
jAlbum Pro has all the features you love in jAlbum, but comes with a commercial license. With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code!... Read more
jAlbum 12.2.4 - Create custom photo gall...
With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code! Beginner-friendly, with pro results Simply drag and drop photos into groups, choose a design... Read more
ExpanDrive 4.1.7 - Access remote files o...
ExpanDrive builds cloud storage in every application, acts just like a USB drive plugged into your Mac. With ExpanDrive, you can securely access any remote file server directly from the Finder or... Read more
OmniOutliner Pro 4.1.3 - Pro version of...
OmniOutliner Pro is a flexible program for creating, collecting, and organizing information. Give your creativity a kick start by using an application that's actually designed to help you think. It'... Read more
Evernote 5.6.2 - Create searchable notes...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more
OmniOutliner 4.1.3 - Organize your ideas...
OmniOutliner is a flexible program for creating, collecting, and organizing information. Give your creativity a kick start by using an application that's actually designed to help you think. It's... Read more
BBEdit 11.0 - Powerful text and HTML edi...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more

Latest Forum Discussions

See All

Garruk Gets His Revenge in a New Magic 2...
Garruk Gets His Revenge in a New Magic 2015 Expansion, Coming This November Posted by Jessica Fisher on October 23rd, 2014 [ permalink ] | Read more »
Sentinels of the Multiverse Review
Sentinels of the Multiverse Review By Rob Thomas on October 23rd, 2014 Our Rating: :: SENTINELS ASSEMBLEiPad Only App - Designed for the iPad Greater Than Games’ tabletop classic, Sentinels of the Multiverse swoops in to save the... | Read more »
Build Your Own Fantasy Football Dynasty...
Build Your Own Fantasy Football Dynasty with Draft Day Posted by Jessica Fisher on October 23rd, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Cars: Fast as Lightning – Tips, Tricks,...
Hey there, Stickers: Want to know all about how impressed we were with Radiator Springs? Check out our Cars: Fast as Lightning review! Cars: Fast as Lightning is a cute and fun app that combines racing and town-building with the charisma and... | Read more »
Jam Messenger Review
Jam Messenger Review By Jennifer Allen on October 23rd, 2014 Our Rating: :: SIMPLE MESSAGINGiPhone App - Designed for the iPhone, compatible with the iPad Want a very quick way to send push-based messages? Jam Messenger is basic... | Read more »
Felllice (Games)
Felllice 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: EXCLUSIVE PRICE DROP! 50% OFF FOR A LIMITED TIME! EAT EAT EAT AND GROW ! | Read more »
The Arrow Game: by Grazie Media (Games)
The Arrow Game: by Grazie Media 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Guide a flying arrow through skyscrapers and city streets to hit a distant target. Experience an endless... | Read more »
Worldly (Games)
Worldly 1.2 Device: iOS Universal Category: Games Price: $2.99, Version: 1.2 (iTunes) Description: | Read more »
Money Pro - EASY! Bills, Budgets and Acc...
Money Pro - EASY! Bills, Budgets and Accounts w/ Sync 1.0 Device: iOS Universal Category: Finance Price: $4.99, Version: 1.0 (iTunes) Description: Manage money like a pro. Money Pro is the next generation of Money app (over 2 million... | Read more »
Pro Strategy Football 2014 (Games)
Pro Strategy Football 2014 2014.141001 Device: iOS Universal Category: Games Price: $4.99, Version: 2014.141001 (iTunes) Description: Take the proven strategy of the PSF franchise and add in Casual Play, improved graphics and... | Read more »

Price Scanner via MacPrices.net

Apple refurbished Time Capsules available sta...
The Apple Store has certified refurbished Time Capsules available for up to $60 off MSRP. Apple’s one-year warranty is included with each Time Capsule, and shipping is free: - 2TB Time Capsule: $255... Read more
Textilus New Word, Notes and PDF Processor fo...
Textilus is new word-crunching, notes, and PDF processor designed exclusively for the iPad. I haven’t had time to thoroughly check it out yet, but it looks great and early reviews are positive.... Read more
WD My Passport Pro Bus-Powered Thunderbolt RA...
WD’s My Passport Pro RAID solution is powered by an integrated Thunderbolt cable for true portability and speeds as high as 233 MB/s. HighlightsOverviewSpecifications Transfer, Back Up And Edit In... Read more
Save with Best Buy’s College Student Deals
Take an additional $50 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through November 1st. Anyone with a valid .EDU email address can take advantage... Read more
iPad Air 2 & iPad mini 3 Best Tablets Yet...
The new iPads turned out to be pretty much everything I’d been hoping for and more than I’d expected.”More” particularly in terms of a drinking-from-a-firehose choice of models and configurations,... Read more
Drafts 4 Reinvents iOS Productivity App
N Richland Hills, Texas based Agile Tortoise has announced the release of Drafts 4 for iPhone and iPad. Drafts is a quick capture note taking app with flexible output actions. Drafts 4 scales from... Read more
AT&T accepting preorders for new iPads fo...
AT&T Wireless is accepting preorders for the new iPad Air 2 and iPad mini 3, cellular models, for $100 off MSRP with a 2-year service agreement: - 16GB iPad Air 2 WiFi + Cellular: $529.99 - 64GB... Read more
Apple offering refurbished Mac Pros for up to...
The Apple Store is offering Apple Certified Refurbished 2013 Mac Pros for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
Select MacBook Airs $100 off MSRP, free shipp...
B&H Photo has 2014 a couple of MacBook Airs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only. They also include free copies of Parallels Desktop and LoJack for... Read more
13-inch 2.5GHz MacBook Pro on sale for $100 o...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999.99 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more

Jobs Board

Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
*Apple* Solutions Consultant (ASC) - Apple (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Project Manager / Business Analyst, WW *Appl...
…a senior project manager / business analyst to work within our Worldwide Apple Fulfillment Operations and the Business Process Re-engineering team. This role will work Read more
*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Position Opening at *Apple* - Apple (United...
…customers purchase our products, you're the one who helps them get more out of their new Apple technology. Your day in the Apple Store is filled with a range of Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.