Put the magazine picture face down on the scanner
Open Photoshop
File Import Cannon scanner
Go to the advanced options where you can change the dpi, color mode and turn Descreen on and off (among other things)
Click the preview button and make sure the picture is showing what you want
Click scan
Save the image as a .psd
Notes from class on tips before scanning:
-Have an idea of what the scan is going to be used for. This will determine the resolution you use. E.g. If you are only scanning an image for your blog, scan at 70-80dpi.
- Use Gloss images over Matt.
- Group similar images together when scanning. E.g. Dark images, magazine scans, fabrics together etc. This helps to determine resolution and colour mode and insures consistency within your scans.
- Line Drawings (DDS) make sure all your lines join. This will help you colour and fill images in Photoshop without having to correct the image after the scan.
- Make sure the scanner is clean.
- Always keep an original of your scan just like a photo negative.
- Always save scans as a .psd (photoshop file) these files never loose clarity.
- Always save a new copy of the scan when you want to use it in a presentation or altering the image in Photoshop.
- Watch out for moiré effect and use ‘descreen’ where necessary.
REMEMBER:
Great images are great from the moment they are captured be it on a camera or scanner. It is always better to start with a GREAT image than trying to alter a good one in Photoshop.
2. The descreen selection reduces Moire (pattern that are often unintentionally created from the glair of magazine picture). The descreen filter should not be used when scanning real photographs. Descreening is important as Moire patterns dramatically reduce the quality of the images you are scanning. The two photos below show the difference between my scanners’ descreen filter. Looking below, the difference is subtle, but first photo (descreen ON) is clearer and brighter. If you click on the images so they blow up to full size, the difference is more visible.
3. Resolution
Before scanning an image, taking a photo, or creating a new file in Photoshop the required resolution and image mode (RGB, CMYK, Gray scale) should be determined.
300 dpi is best for commercial printing of books, glossy magazines and brochures
150-200 dpi is best for laser and inkjet printers (home/office printers), however you should make a test print to clarify the best resolution for you printer
72-96 dpi is best for e-mail attachments, the web, PowerPoint and multimedia
We should use 360 dpi as a general rule
The following three images are 72 dpi, 150dpi and 360dpi (in that order)
Major changes to resolution after you have started may result in loss of detail and colour
The larger the dpi the better the quality of the shot
4. The scan from my illustration class was scanned at 360dpi. I chose to scan at the best quality so that I could work with it in Photoshop. However, if I was scanning it just for this blog, or for any web page, I would have scanned it at 72 dpi. This is the same for the fabric scan. Given the option, the colour mode for the fashion illustration would have been a Bitmap (since it is a black and white line drawing). However, my scanner did not give me this option so instead it is in RBG. The colour mode for the fabric scan is RGB.
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