A Short Course Book
Sensors, Pixels and Image Sizes

Exploring Print Sizes

 
 
Click to open an Excel worksheet and use Part 3a. Printing Images- Print Sizes to follow the instructions in this section.
Part 3 on the Excel worksheet "Pixels & Images Calculator" calculates the size of print you can expect from a given file size and the dpi you choose to print at. The numbers in the descriptions that follow refer to row numbers on the worksheet.

1. Width of image (in pixels) is where you enter the image's width in pixels.

2. Height of image (in pixels) is where you enter the image's height in pixels.

3. Printer's resolution (in dpi) is where you enter the resolution your printer uses (this isn't the same as the number of ink drops it sprays, and is usually set in a photo-editing program).

4. Width of print (in inches) is calculated by dividing the width of the image in pixels (line 1) by the dots-per-inch used to print it (line 3).

5. Height of print (in inches) is calculated by dividing the height of the image in pixels (line 2) by the dots-per-inch used to print it (line 3)

Exercises

Open the worksheet by clicking the Excel button in this section and enter numbers in the green cells to explore the questions that follow.

1. If your image is 1600 x 1200 and you print it at 600 dpi, how big will the print be?

2. If your image is 800 x 600 and you print it at 300 dpi, how big will the print be?

3. If you print an image at 300 dpi, how wide will it have to be in pixels, to get a 6-inch wide print?

4. Using the original widths and heights listed below and the specified printer dpi's, calculate the width and height of the prints you'd get.

   . Original 800 x 600, printed at 300 dpi is ____ x ____

   . Original 800 x 600, printed at 600 dpi is ____ x ____

   . Original 1600 x 1200, printed at 300 dpi is ____ x ____

   . Original 1600 x 1200, printed at 600 dpi is ____ x ____

   . Original 1800 x 1600, printed at 300 dpi is ____ x ____

   . Original 1800 x 1600, printed at 600 dpi is ____ x ____
 


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