DEMYSTIFYING INKJET PRINTING
Inkjet Printing Technologies
Scanning & Printing Tips
What is Ink Jet Printing ?
INK JET PRINTING IS AN INTEGRATED SYSTEM
IMAGE + PRINTER + INK + MEDIA
- Image/Source needs to be OPTIMIZED
- Printers must effectively control the placement of the media, and disbursement of the ink.
- Ink must provide a cost effective, vivid & reliable presentation.
- Media must minimally compliment or enhance the ink’s presentation of the image.
INKJET PRINTING TECHNOLOGIES
3 Basic Inkjet Printing Technologies
- Continuous Flow
- Thermal (Bubble Jet)
- Piezo Electric
- High System Cost, typical of large scale plotters
- Complex Ink System requiring maintenance
- Multiple Dedicated print heads
- Best suited for graphic arts and industrial applications
- Drop-On-Demand System
- Voltage pulses applied to a heater which gassifies
- Force of the bubble foreces ink to jet out
- Most popular technology
HP Deskjet, ThinkJet, Design Jet
- Drops are produced by a transducer
- Droplets are subsequently distorted relative to the data charge
- Yields small drop sizes/high resolutions
- Open orifice requires careful control of ink drying characteristics
Epson Color Stylus & Photo Series
Some Industrial plotters
INK Jet Media
- Limit and control dot size and shape
- Hold colorant on surface, control the absorption
rate. (Store the carrier until medium has evaporated.)
- Provide brilliant and neutral reflective background
- Prevent "curling"
- Provide various textures, and appearance
A HIGH QUALITY PRODUCT WILL HAVE:
- Barrier coating (prevents saturation)
- Reflective coating
- Sealer coating
- Texture/Finish coating
- Gloss coating
- COATED BOND PAPERS, (various weights, finishes)
A wide array is available from low end "thrifty" paper to "photo quality".
ALL inkjet paper is coated on BOTH sides Brightness ranges from 80 to 94+
Opacity is extremely important
- GLOSSY PAPERS,
Bond paper used as a substrate, various thickness
and glossy finishes applied. (Usually premium)
Whiteness is not always the best measure
Consistency sometimes a concern
- GLOSSY FILMS
Synthetic materials (polyester based)
Durability is greater than Glossy Paper
Much thinner, usually more expensive
- SPECIALTY FILMS
Transfer Paper, Backlight, Silver, Gold,
Transparency, UV Reactive Transfer
- TEXTURED MEDIA
Canvas, Silk, Linen, etc.
COATED BOND PAPERS
COATED INK JET PAPER, 20 - 24 lb
- Inexpensive trial prints for more expensive
- Reports, Correspondence, Graphic
ULTRA RESOLUTION, 27lb
- Relatively inexpensive
- Photographic quality bond provides a
"matte" finish, with "true" color presentation.
- Heavier paper, accommodates dense and high resolution, (greater ink volume)
- May be framed
- Reports, Correspondence, Graphic
- Photo paper achieves "snapshot" thickness, and glossy finish.
- Primary applications are photographic, and signage
DOUBLE SIDED WEATHERPROOF
- Glossy one side, matte the other
- Water Resistant
(AVAILABLE SOON !!)
OPAQUE GLOSSY FILM
- Much thinner, greater durability!
- Excellent photo material !
- Creates very unique business cards, calendars, craft activities
TRANSFER PAPER (actually film)
- Extremely popular !
- Transfer is accommodated via a
- No longer required to remove backing
while it is hot !
- Can be applied to most porous surfaces
(cloth, some wood)
- Ultra-Violet Reactive is available !
(Changes color in sun light)
- Special surface to hold the ink
- Printed w/mirror image makes great signs
- Pre-attached fly sheet
SILVER REFLECTIVE FILM
- Excellent special affects;
- Black & White Photos
- Applications include marketing, certificates, crafts, business cards
- Clear film with an adhesive backing
- Ideal for decorations, decals, bumper stickers, labels, etc.
BACK LIGHT FILM
- UV and Water Resistant film, developed for light boxes
- Applications include; signs, badges, displays
FABRIC and TEXTURES
- Provides artistic texture
- May be painted as well as printed
- Ideal for photos, greeting cards & crafts
- Actual prestretched canvas
- Great for portraits, and oil painting effects
- Polyester Silk with adhesive backing
- Applications include numerous craft projects; stickers, doll house wall paper, lamp shade appliqués, wedding book, notebook covers, etc.
- Magnetic Backed Photo
- Weatherproof media
CARTRIDGES and INK
- Alternative quality inks and cartridges ARE available !
ALL INKS ARE NOT EQUAL !!
- Be cautious of "1 Ink for Any Printer"
- Dye-based vs. Pigment-based
Dye based afford a larger range of colors
Less stable than pigment
(Most inkjet ink)
- Pigment ink is waterproof, better for photocopy
Longer dry time
(Some HP Black)
- Printer warranty will not be affected
- Have confidence in your source
- EXTREMELY COST EFFECTIVE !!
OEM cartridge cost typically $18 - $32 up
After market cartridge cost $ 8 - $25 up
Refill Cost (per cartridge) $ 2 - $ 4
- Some cases After Market cartridges better than
OEM for refilling
- Minimal learning curve required
- Refill same cartridge typically 4 - 5 times
UNDERSTAND YOUR PRINTER DRIVER
- Media selection will alter the volume of ink released
+ - Plain Paper, relatively high due to the absorbency of media
- Inkjet Paper, nominal amount utilizing the resolution desired.
- Photo Paper, less than inkjet paper due to gloss coatings
- - Transparency/Film, least amount
- SELECTING THE HIGHEST RESOLUTION WILL NOT AFFORD THE GREATEST IMAGE
- Solvent based "fixatives" will increase the durability of your images and reduce water impacts.
- OCR, (Optical Character Recognition)
- Line Art, Images made of solid black lines no shading
Determining Scanning Resolution
OCR - Scan at highest resolution your system will support
Line Art - Use the same resolution you are going to print at, if the image is not being resized.
Resizing the image:
Increasing the size - double the ptr resolution
Decreasing the size - half the ptr resolution
Photos/Art - Scan at a maximum of 1/3 the printer resolution, up to a maximum of about 300 dpi. (Print at 720 dpi, scan at 240 or less)
Scanning at higher resolutions will produce HUGE files, but not necessarily better results.
As resolution doubles, file size quadruples,
Scanning a 4" x 4" color picture
150 dpi file size is approx. 1 MB
600 dpi file size is greater than 16 MB
Using a 600 dpi ptr both images print identically
High Resolution images.....
... take more hard drive space
... longer to print
... drive used as virtual memory
... longer for image data transfer, & display
Not all save file formats are accessible with every image type. For example, some file formats do not support 24-bit color and may be grayed out in the file format list of your scanner.
Lossless formats - When file is opened the image is identical to the originial file.
Lossy formats - Image losses some detail when you save it.
GIF - (CompuServ Bitmap) This palette color file format uses lossless compression and is often used on the Internet.
JPG - (Joint Photographic Experts Group Bitmap) Supports high-compression ratios but is a lossy file format. Do not save in JPG mode until all image editing is done. Use JPG for any file you use online, either e-mail, web sites.
PCX - (PC Paintbrush) Supports only grayscale and palette color images, works with many older programs.
TIF - (Tag Image Format) Most universally accepted, about 1/2 the size of BMP, supports black and white, grayscale, palettecolor, and RGB. Use TIF for any image you plan to print.
TGA - (Targa Format) Saves color information files (often with the image mask).
BMP - (Windows Bitmap Format) Standard Windows file.
Large file size limited detail.
- Photo CD’s and Floppys
- Photo e-mail
- Digital Cameras
Frequently asked questions . . . . .
Q. Why is the color printed different than what is displayed ?
A. Monitors & Scanners use RGB - additive colors, Printers use CMYK - subtractive colors.
(Some colors display on monitor are not printable and vise versa).
If colors scanned are too dark on monitor adj. gamma setting on monitor, if screen good, & print poor, contact ptr mfg for a Color Mgmt Sys profile for your ptr.
SELECTING A SCANNER ....
- Flatbed scanners are the most versatile
- Maximize optical resolution (not interpolated)
eg: 600 dpi (H) x 1200 dpi (V)
9600 dpi x 9600 dpi (s/w interpolation)
- Scan area size
- Color Capability:
36 bit 68.7 billion colors
24 bit 16.7 billion colors
12 bit 4096 shades of gray
8 bit 256 shades of gray
- Features (negatives, slides, 3-D)
- Bundled Software
- Interface, System Requirements
Parallel vs SCSI
- Protocol - TWAIN
(Technology without an Interesting Name)
SELECTING A PRINTER ....
- Determine your printing needs...
Primary text or graphics ?
Speed or Initial Cost ?
Media Requirements ? (Size)
Cost of Operation ?
Cost of Ownership......
$8 - $15
MAINTAINING YOUR PRINTER
Clean your printer regularly !! (Cartridge change)
Coated paper will leave a residue in the paper path.
Invest in a dust cover !
Basic Size - The standard size for a grade of paper, used to determine its basis weight. (e.g. Bond 17x22).
Basis Weight - The weight of a ream of paper in the Basic Size for that grade (e.g. 500 sheets of Sub. 20 Bond paper in its basic size, 17x22 in., would weigh 20lb).
Brightness - The measurement of a paper’s light-reflective qualities that affect contrast and halftone reproduction.
Caliper - the thickness of a sheet, or stack of sheets of paper as expressed in thousandths of an inch (mils); also referred to as Bulk.
Opacity - The ability of paper to inhibit show-through of material printed on its other side or from sheet to sheet. Usually, the lower the basis weight, the less opacity.