Determining Pixels per Foot |
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Determining Pixels per Foot |
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Determining Pixels per Foot
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Determining Pixels per Foot |
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Determining Pixels per Foot |
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| 1. | To determine the number of Pixels per Foot, open the image in a graphics program such as Microsoft Paint. |
| 2. | You will use the following formula: Pixels per Foot = Pixels in Span ÷ Length Represented. To calculate Pixels per Meter, simply replace Foot with Meter and use meters as the length represented. |
| 3. | The Length Represented is simply the number of feet represented between two points in the image. |
| 4. | The Pixels in Span is the number of pixels between two points in the image. To count how many pixels there are between two points, we can use the x,y coordinates that appear in the bottom right corner of the Microsoft Paint window. |
| a. | Move your mouse to the first point and record the relevant coordinate. If you are measuring a horizontal line, use the x coordinate; for a vertical line, use the y coordinate. |
| b. | Move your mouse to the second point and record that coordinate. |
| c. | Subtract the smaller number from the larger number to get the total number of pixels in that span. |
| 5. | Now use the formula to determine the Pixels per Foot. |
Example
| 1. | The image is a rectangle representing a room 50 feet wide by 30 feet long. |
| 2. | In the graphics program, the vertical edge of the rectangle represents 30 feet. |
| 3. | Using the mouse point, we determine that the top point of the line is at the 15 Y coordinate and the bottom point is at the 304 Y coordinate. |
| 4. | Subtracting the larger number from the smaller, we determine that the pixels in the vertical line totals 289 Pixels in Span. |
| 5. | Now use the formula to determine the Pixels per Foot: Pixels per Foot = 289 Pixels ÷ 30 Feet = 9.63 Pixels per Foot |