Embedded Image Scale Factors
If an image is opened which contains an embedded scale factor, the factor will be set in light-gray text in the “Scale” panel, and the corresponding calibration units will be set automatically.
Loading a Recipe with a scale factor, or setting a scale factor, will overwrite the image scale factor. Erasing the Recipe scale factor will revert back to the image scale factor.
Scale Calibration Tool
The Scale Calibration tool allows users to calculate their pixel size, such that distance and areal measurements can be made in physical units, rather than pixels. The image used for calibration should contain an object of a known length (typically a scale bar), and should be of the same magnification and pixel density as the image to measure.
This tool can be used in 1 of 2 modes: Auto or Manual:
Auto Mode lets MIPAR automatically detect the scale bar in your image, without you having to manually define it! To use Auto Mode:
- Click “AUTO”
- Drag the blue box roughly around the area of the scale bar
- Click “✓” to confirm
MIPAR will then automatically detect the scale bar and place a line across it. You may then proceed with step 2 and 3 (see below) to enter the physical distance and calculate the scale factor.
Manual Mode may be used when MIPAR is unable to automatically detect the scale bar in your image. To use Manual Mode:
- Click the Distance Line tool
- Drag the line to span across the scale bar
You may then proceed with step 2 and 3 (see below) to enter the physical distance and calculate the scale factor.
1. Set Line
Use Auto Mode or Manual Mode (activate the Distance Line tool)
2. Enter Distance
Enter known distance spanned by line
Calculate the scale factor
4. Scale Factor
The scale factor is displayed. Click “Accept” or “Cancel”.
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