Column heading
Last updated on
Oct 27, 2025
Learn more about how to measure image features in Photoshop and understand what each data point records in the Measurement Log.
When you measure an image in Photoshop, the data points you select determine the values recorded in the Measurement Log. Each data point corresponds to the measurement tool you use.
Heading
|
|
Column heading |
|
Angle |
Records the angle of orientation (±0-180) defined by the Ruler tool. |
|
Area |
Records the area of the selection in square pixels, or in calibrated units according to the current measurement scale (for example, square millimeters). |
|
Circularity |
Records the shape factor using the formula 4π × (Area ÷ Perimeter²). A value of 1.0 indicates a perfect circle, while values closer to 0.0 indicate elongated polygons. May not be valid for very small selections. |
|
Count |
Records the count value based on the active tool: number of discontinuous selection areas, number of counted items (Count tool), or number of ruler lines (Ruler tool). |
|
Date and Time |
Records the date and time stamp of when the measurement occurred. |
|
Document |
Records the name of the document (file) measured. |
|
Gray Value |
Records brightness values of the selection. Values range from 0–255 (8-bit), 0–32,768 (16-bit), or 0.0–10 (32-bit). Photoshop converts the image internally to grayscale and calculates mean, median, minimum, and maximum values. |
|
Height |
Records the height of the selection (max y – min y), based on the current measurement scale. |
|
Histogram |
Records histogram data for each channel (RGB, CMYK, etc.). Data is exported as CSV files when saving the Measurement Log. For multiple selections, one histogram file is generated for the total selection and additional files for each separate selection. |
|
Integrated Density |
Records the sum of all pixel values in the selection. Equivalent to Area (in pixels) × Mean Gray Value. |
|
Label |
Records a unique identifier for each measurement (for example, Measurement 1, Measurement 2). For multiple selections, assigns an additional Feature label and number. |
|
Length |
Records the linear distance defined by the Ruler tool, based on the current measurement scale. |
|
Perimeter |
Records the perimeter of the selection. For multiple selections, one perimeter is recorded for the total selection and additional values for each separate selection. |
|
Scale |
Records the measurement scale of the source document (for example, 100 px = 3 miles). |
|
Scale Units |
Records the logical units of the measurement scale (for example, pixels, millimeters). |
|
Scale Factor |
Records the number of pixels assigned to each scale unit. |
|
Source |
Records the measurement source: Ruler tool, Count tool, or Selection. |
|
Width |
Records the width of the selection (max x – min x), based on the current measurement scale. |
Create stunning images with Photoshop
Edit, retouch, and transform photos with the industry-leading creative tools you know and love.
