After a 'very' productive computing lesson, I went home to see if the curse of the dodgy scanner leaked out to the western suburbs, of course it did. My beast scanner decided to go on strike as well. Pfft technology. . . after three attempts to get it working again it magically decides to function.
How to scan in Photoshop/
File - Import - Hp Scanner
I placed a magazine image in the scanner.
Then a preview of the image appeared on my scren where I could crop the image, select different colours and resolutions. However I didn't realise I can only choose from standard resolution selections eg: 75, 150, 200, 300 dpi. I'm guessing this is because my scanner is standard version? Still trying to figure out how to enter my own choice of resolution so if anyone knows.. tell me please ! :)
My scanner also doesn't have a descreen selection button because it automatically improves the quality of the image. Descreening essentially improves the sharpness of the picture. Images used in magazines are produced with a method called "halftoning." The Scan Help website describes these images as "a series of overlapping dots that fool your eye into seeing more colours than are actually there. Because of these overlapping dots, scanning these documents or images will produce something known as a Moire' pattern." (www.scanhelp.com/288int/scontent/descreen.html) Therefore, descreening takes place to improve the quality of the image.
These images show the before and after effects of descreen
ing.
Before Descreen
After Descreen
The patchiness of the photograph is gone and there is no evidence of layered images as the Descreening mode has improved this.
The resolution of images depends upon their purpose ie:
Images with 300 dpi are suitable for commercial books, glossy magazines and brochures. The higher dpi produces a high printing quality with more pixels included in the image.
Images with 150-200 dpi are suitable for laser and inkjet printers producing print presentations for fashion.
Images with 72-96 dpi are suitable for email, websites and powerpoint presentation.
This DDS was produced in my Fashion Illustration class. It's scanned at 72 dpi in grayscale as it is a black and white image only for Internet imaging at the moment. However if I were to work on this image in illustrate I would probably scan it again at 150 dip for printing purposes to gain a finer resolution.
gemma,
xx