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Manufacturers of printers or devices that use colour ink jet technology are meant to abide by this standard when testing for, and labeling the estimated yields of their products. The testing focused on sampling yields generated from typical business consumer printing applications.
It was replaced by the HP DeskJet 310 (4 ppm B&W, 4 minutes per page color) in 1993, the HP DeskJet 320 in 1994, the HP DeskJet 340 (2 minutes per page color) in 1995, and the HP DeskJet 350 and 350CBi (5 ppm B&W, 2 ppm color) in 2000. HP continued to make black-and-white-only inkjet printers with the HP DeskJet 510 (1992) and 520 (1994).
The print engine of most All-in-one devices is based either on a home desktop inkjet printer, or on a home desktop laser printer. They may be black-and-white or colour capable. Laser models provide a better result for text while inkjet gives a more convincing result for images and they are a cheaper multifunctional. [3]
In September 1994 HP introduced the Color LaserJet, the corporation's first color laser printer. The printer had an average cost per page of less than 10 cents. The Color LaserJet offered 2 ppm color printing and 10 ppm for black text, 8MB of memory, 45 built-in fonts, a 1,250-sheet paper tray and enhanced PCL 5 with color. It was priced at $7,295.
The LaserJet 4 Plus (4+), released in 1994, was the LaserJet 4 with the improved Canon EX+ engine which increased printing speed to 12 PPM. [3] This also provided the option for duplex printing (automatic double-sided printing) with the purchase of an accessory (HP part number C3157A).
Line printers print an entire line of text at a time. Four principal designs exist. Print drum from drum printer. Drum printers, where a horizontally mounted rotating drum carries the entire character set of the printer repeated in each printable character position. The IBM 1132 printer is an example of a drum printer. [19]
This number lets the printer or software know the intended size of the image, or in the case of scanned images, the size of the original scanned object. For example, a bitmap image may measure 1,000 × 1,000 pixels, a resolution of 1 megapixel. If it is labelled as 250 PPI, that is an instruction to the printer to print it at a size of 4 × 4 ...
Modern inkjet printers can print microscopic dots at any location, and don't require a screen grid, with the metric dots per inch (DPI). These are both different from pixel density or pixels per inch (PPI) because a pixel is a single sample of any color, whereas an inkjet print can only print a dot of a specific color either on or off.