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Chapter 3. Startup > To calculate the proper resolution for a scan or for an ex...

To calculate the proper resolution for a scan or for an existing image:

1.
Create a new RGB Color document (File > New), enter the final Width and Height dimensions, choose 72 ppi for the image Resolution, then click OK. (The resolution will be readjusted in step 5).

2.
Choose Image > Image Size.

3.
Click Auto on the right side of the dialog box.

4.
Enter the Screen frequency of your final output device (the lpi, or lines per inch setting that your print shop will be using) .


Use the Auto Resolution dialog box to have Photoshop calculate the appropriate resolution for an image based on your chosen output parameters.


5.
Click Quality: Draft (1 × screen frequency), Good ( × screen frequency), or Best (2 × screen frequency).

6.
Click OK.

7.
Jot down the Document Size: Resolution value, which is the proper value to enter when you scan your image.

Note: If you’re going to scale the final image up or down in Photoshop, you should multiply the resolution by that scale factor to arrive at the proper resolution for the scan. You don’t need to multiply the resolution if you’re going to scale the original image when you scan it.

8.
Click Cancel.

File storage sizes of scanned images
SizePPIBlack/WhiteGrayscaleRGB Color
(In inches)(Resolution)1-Bit8-Bit24-Bit
2 × 315017 KB132 KB436 KB
 30067 KB528 KB1.66 MB
4 × 515056 KB440 KB1.39 MB
 300221 KB1.72 MB5.44 MB
8 × 10150220 KB1.72 MB5.44 MB
 300879 KB6.87 MB21.64 MB
Note: These file storage sizes are for a one-layer TIFF file with no alpha channels.



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