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

Dash 3.0.2 - Instant search and offline...
Dash is an API Documentation Browser and Code Snippet Manager. Dash helps you store snippets of code, as well as instantly search and browse documentation for almost any API you might use (for a full... Read more
FontExplorer X Pro 5.0 - Font management...
FontExplorer X Pro is optimized for professional use; it's the solution that gives you the power you need to manage all your fonts. Now you can more easily manage, activate and organize your... Read more
Typinator 6.6 - Speedy and reliable text...
Typinator turbo-charges your typing productivity. Type a little. Typinator does the rest. We've all faced projects that require repetitive typing tasks. With Typinator, you can store commonly used... Read more
Arq 4.12.1 - Online backup to Google Dri...
Arq is super-easy online backup for the Mac. Back up to your own Google Drive storage (15GB free storage), your own Amazon Glacier ($.01/GB per month storage) or S3, or any SFTP server. Arq backs up... Read more
Gutenprint 5.2.11-pre1 - Quality drivers...
Gutenprint is a suite of printer drivers that may be used with most common UNIX print spooling systems, including CUPS, lpr, LPRng, or others. Gutenprint currently supports over 2000 printer models.... Read more
Dropbox 3.6.8 - Cloud backup and synchro...
Dropbox is an application that creates a special Finder folder that automatically syncs online and between your computers. It allows you to both backup files and keep them up-to-date between systems... Read more
Evernote 6.0.15 - Create searchable note...
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
MacUpdate Desktop 6.0.7 - Search and ins...
MacUpdate Desktop 6 brings seamless 1-click installs and version updates to your Mac. With a free MacUpdate account and MacUpdate Desktop 6, Mac users can now install almost any Mac app on macupdate.... Read more
Freeway Pro 7.0.4 - Drag-and-drop Web de...
Freeway Pro lets you design and build sophisticated responsive websites code free. With its user-oriented drag-and-drop interface, Freeway Pro helps you piece together the website of your dreams. Add... Read more
VueScan 9.5.18 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more

This Week at 148Apps:June 22-26, 2015
June's Summer Journey Continues With 148Apps How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you're looking for. The ones we love become Editor’s Choice,... | Read more »
LEGO® Minifigures Online (Games)
LEGO® Minifigures Online 1.0.1 Device: iOS iPhone Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: | Read more »
World of Tanks Blitz celebrates its firs...
Today marks the first anniversary of the launch of World of Tanks Blitz, the mobile version of the PC tank battler, World of Tanks. World of Tanks Blitz launched on iOS and Android on June 26th last year and to celebrate, Wargaming is giving all... | Read more »
Heroes and Castles 2 Has its Own Standal...
Heroes and Castles 2 is a third-person castle defense game from the same team behind Block Fortress and Bug Heroes. It's cool, it's fun, and now it has its very own free version. [Read more] | Read more »
Formula Cartoon All-Stars Lets You Race...
Ever want to pit your favorite characters from shows like Steven Universe, Adventure Time, and Regular Show against each other in a not quite death race? Well once upon a time you could, but Formula All Stars Touch N' Go doesn't exist anymore. Hope... | Read more »
Retype - Typography Photo Editor (Photo...
Retype - Typography Photo Editor 1.0 Device: iOS Universal Category: Photography Price: $2.99, Version: 1.0 (iTunes) Description: Retype is built out of passion for great typography and it's all about adding text to photo with style... | Read more »
Hungry Shark Evolution Celebrates Shark...
Shark Week is almost here, as is Independence Day, so naturally Hungry Shark Evolution is going to get in on the action. Yes, even the fireworks. [Read more] | Read more »
The New Trivia Crack Will Feature a Musi...
It's official: iHeartMedia (you may know them from iHeartRadio) will be in charge of providing music-related questions for Trivia Crack's upcoming sequel. Also Trivia Crack is getting a sequel. [Read more] | Read more »
Toca Life: City (Education)
Toca Life: City 1.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0 (iTunes) Description: Welcome to Toca Life: City, a metropolis filled with everyday fun! Customize characters, explore exciting locations and... | Read more »
Ironkill's Big New Update is Big an...
The other popular robot fighting game on the App Store, Ironkill, has received a pretty substantial update today. We're talking new bots, new rewards, graphical tweaks; the works. [Read more] | Read more »

Price Scanner via MacPrices.net

MacBook Airs on sale for up to $75 off MSRP
Save up to $75 on the purchase of a new 2015 13″ or 11″ 1.6GHz MacBook Air at the following resellers. Shipping is free with each model: 11" 128GB MSRP $899 11" 256GB... Read more
Apple’s Education discount saves up to $300 o...
Purchase a new Mac or iPad at The Apple Store for Education and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free,... Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store has Apple Certified Refurbished Mac Pros available 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
Mac Pros on sale for up to $260 off MSRP
B&H Photo has Mac Pros on sale for up to $260 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2799, $200 off MSRP - 3.5GHz 6-core Mac Pro: $3719.99... Read more
Save up to $400 on 2014 15-inch Retina MacBoo...
B&H Photo has previous-generation 2014 15″ Retina MacBook Pros on sale for up to $400 off original MSRP. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro... Read more
15-inch Retina MacBook Pros on sale for up to...
B&H Photo has new 2015 15″ Retina MacBook Pros on sale for up to $125 off MSRP including free shipping plus NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $1899.99 $100 off - 15″ 2.5GHz... Read more
College Student Deals: Additional $100 off Ma...
Take an additional $100 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through July 11, 2015. Anyone with a valid .EDU email address can take advantage... Read more
Apple refurbished Time Capsules available for...
The Apple Store has certified refurbished Time Capsules available for $100 off MSRP. Apple’s one-year warranty is included with each Time Capsule, and shipping is free: - 2TB Time Capsule: $199, $100... Read more
Newsweek Launches iPhone App
The venerable weekly news magazine Newsweek, owned by IBT Media, has announced the launch of its first iPhone app. The new app is available through Apple’s App Store and will allow consumers to read... Read more
New Initiative Covering 80 Million Homes Will...
Today, Internet service providers, equipment suppliers and retail equipment manufacturers joined the Consumer Electronics Association (CEA) and the National Cable & Telecommunications Association... Read more

Jobs Board

Architect / Senior Software Engineer, *Apple...
**Job Summary** Apple Pay is already changing our pay-habit in a deeper and fundamental level. We are looking for a software engineer with a passion for large scale inte Read more
Project Manager, *Apple* Retail New Store O...
**Job Summary** An Apple Retail New Store Openings & Remodels Project Manager is responsible for successfully managing the openings, remodels, and small works of Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
Program Manger, WW *Apple* Direct Fulfillme...
**Job Summary** We are seeking a business analyst to work within our Worldwide Apple Direct Fulfillment Operations team. This role will work closely with related program Read more
Hardware Design Validation Engineer - *Apple...
**Job Summary** The Apple Watch team is looking for a Hardware Design Validation Engineer. This person will be part of the Apple Watch hardware team with Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.