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Lab Handbook |
Scanning Using The Epson Perfection 1240U
Example scanning procedure for a 300 X 300 image for displaying onscreen...
| Open Adobe Photoshop 6.0 as shown above.
Under File, select Import, WIA-EPSON Perfection 1240U
Allow the scanner to warm up (until the green light stops flashing) before proceeding.
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| Select the Custom Settings option.
Click on Adjust the quality of the scanned picture.
Set the resolution of your scan (see image below) and click on Preview. |
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| Set Resolution to 300 dots per inch.
Under Picture type: select Color picture
Click OK. |
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| Click on and drag any of the green square corners to adjust the area of the image to be scanned. Be sure to leave a little space outside the image. This can be cropped out later.
Click on Scan. |
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| The scanned image is imported into Photoshop and displayed on the screen.
Select the portion of the image that you want to use. |
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| After selecting the desired area of your image, click on Image from the menu bar and choose Crop. |
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| The original scan is cropped and your new image is displayed. |
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| To adjust the colors of your image click on Image, select Adjust and then Levels... |
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| Click and drag each of the three small triangles (level sliders) under the Input Levels: label to adjust the colors of your image.
The highlight slider (on the far right) makes the highlights of your image a little brighter if the value is decreased (field containing the value of 216).
The mid-tone slider (in the middle) brightens the middle greys of your image a little if the value is increased.
The slider on the left adjusts the darkest tones (shadows) of your image.
The Output Levels (bottom) usually do not need to be touched. |
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| Now, you need to adjust the size and resolution of the image.
First click on Image from the menu bar and select Image Size... |
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| A computer is slower at drawing a 300 dpi (dots per inch) image on your computer monitor than it is at drawing one at 72 dpi. One of our concerns is the speed of stimulus presentation, therfore we need to change the resolution from 300 dpi to 72 dpi.
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Next, find the largest of the two values in the Width and Height boxes. If you do not see pixels in this section use the drop down boxes next to the Width and Height fields to switch to pixels.
Change the largest value to 300. The other value will scale down automatically.
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| To increase the quality of your image click on Filter from the menu bar, select Sharpen and Unsharp Mask...
Note: This option is only for images that have been resized. |
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| Make sure the Preview box is checked so you can see the changes you are making as they are being applied to your image.
Once you are satisfied with the result click OK. |
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| Finally, to make your image exactly 300 X 300 pixels in size, click Image from the menu bar and select Canvas Size... |
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| Change both values to 300, if necessary.
Click OK. |
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| Here is your final image.
Note that next to the title of the window, it says "100%" meaning that you are viewing the actual size of the image. |
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