From Lidka's Articles:

PPI, DPI and Colour Depth Unravelled
Tips and Techniques for Scanning Lean and Mean

Many Photoshop users are good with their software tools, but relatively few truly understand the meaning and application of “dpi”, “ppi” and “lpi”. Even fewer dig past the idea of 1-bit color depth. We all know that 300 ppi scans are called “high-res” and 150 ppi scans are called “low-res”. But what are the real world differences between them in your workflow?

This article will discuss the fundamentals for scanning lean and mean. The difference between being able to complete a project on time — or not — using your present hardware may hinge on whether you create monster files too large to manage. So here’s how to avoid them.

WHAT DETERMINES BITMAP FILE SIZES?

Bitmapped images are composed of square elements called pixels,which require color information to be assigned to each and everyone. The greater the number of pixels and color information, the bigger the file size. To be precise, bitmap file sizes are affected by three factors: image dimensions, image resolution, and image color depth (also known as ‘tonal’ depth).

We don’t usually have a lot of flexibility in choosing image dimensions or color depth, but we can certainly control file sizes by scanning images with the correct resolution for output. To understand how to scan for printing, we first have to tackle the subjects of ppi, dpi, lpi and tonal depth of images.

Interested in reading more? Click here to download the full article (PDF, 298 K)

WORKSHOPS in STUDIO L

workdhops

courses
seminars on-site

Advanced Workshops in Studio L

PREREQUISITES: Advanced computer knowledge and experience in the design/graphic industry.

FEE IN STUDIO L: First three hours (small group): $165 plus GST per person,
additional hours: $45 per hour plus GST per person.
One to one: $85/hr plus GST.


SAMPLE TOPICS:

• MOVING from QUARKXPRESS to INDESIGN

Tips and techniques for an easy switch from QuarkXPress to InDesign.

• UPGRADING TO ADOBE CS

New, time saving techniques and tools in Adobe Photoshop, Illustrator and InDesign CS.

• RICH MEDIA PDF

How to create Rich Media PDF documents using InDesign and Acrobat.

• QUARKXPRESS, ADOBE ILLUSTRATOR, ADOBE PHOTOSHOP

Style sheets, master pages, libraries, masks, channels, paths, PPI, DPI, LPI, and everything else you need to know about these programs: you make a list of questions, we answer them.

• FONT MANAGEMENT in OS X

Font systems, font locations and font management software.

• MAC MAINTENANCE in OS X

How to minimize crashes, corrupted media and file problems and how to repair and organize your Mac: Views, Accounts, File Management in OS X, Fonts in OS X, Disk Utility, Repairing Permissions, Preferences, etc.

• PDF IN DAILY WORKFLOW

How to create PDF files for a specific output from Adobe Illustrator, QuarkXPress and Adobe InDesign.

• OUTPUT PROBLEM SOLVING and CRITICAL THINKING

Why my Prepress technicians get goose bumps and turn red when they see me?
All about file formats, file sizes, preflight checks, embedding or linkibg, trouble shooting and software/hardware interaction in the prepress production line.

• COLOUR in PREPRESS and DIGITAL IMAGING

Tips for more effective work with digital colour.
• Colour Settings, Assign Color Profile, Convert to Color Profile
• CMYK (web sheetfed, coated, uncoated), RGB (sRGB, Adobe RGB) and indexed colour systems

• DIGITAL TRAPPING

Knockout and overprint, principles of trapping and digital trapping techniques used in QuarkXPress, Adobe Illustrator and Adobe InDesign.

• SCANNING for PREPRESS or MONITOR DISPLAY

LPI, DPI ile formats, colour systems, formulas and other principles of scanning for printed output, or monitor-displayed output (web, slide presentations, CD ROM).

• DIGITAL TYPOGRAPHY

How to type and save your copy to make editing an easy job on both Windows and Mac environments: terminology, paragraph controls, file formats. How to clean a text file coming from someone who doesn't know the above.

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Terms & Conditions

For on-site seminars, the full fee is due on the day of the first seminar. The cancellation fee of 25% will be charged for client-induced cancellations.

For workshops in Studio L, a 25% non-refundable deposit is due three weeks prior to the start date of the workshop. The outstanding balance is due on the day of the first workshop.

Although deposits are non-refundable, under extenuating circumstances (family emergency or health), they may be applied to a workshop taken at a later date (within three months or as soon as an opening becomes available).

A complete refund is available only in the unlikely event that Studio L is forced to cancel a scheduled workshop. Otherwise, no refunds will be available.

If payment is made by cheque without sufficient funds to complete the transaction, Studio L will charge a $25.00 administration fee.

A student has the right to reschedule one class out of each workshop due to sickness (and if you are sick, we definitely want you to stay at home and get better), work or family emergency. If you must reschedule a class, we expect you to give us a minimum of 24 hours notice, or call us as soon as you know of the emergency. You are also responsible for rescheduling the class to everyone's convenience.

On rare occasions and with Studio L's approval, a student may have to postpone a part of the workshop, however, the workshop must be resumed within a month of the drop-out date or as soon as an opening becomes available.

All terms & conditions are subject to change without notice.

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