3.1 2D Reference Line

Use 2D Ref Line when a simple scale is appropriate for the measurement.

Procedure

1. Select 2D Ref Line.

2. Place the first reference point.

3. Place the second reference point.

4. Enter the known physical distance.

5. Select the required unit.

6. Apply the calibration.

The reference establishes the image scale for the measurements.

3.3 Custom Units

Pscale also supports:

Custom unit

You can type any unit name required for your project.

Examples:

• tiles

• panels

• boards

• blocks

• books

• units

The custom unit becomes the unit used for the calibrated measurements.

3.4 3D Perspective Plane

Use 3D Plane when a flat surface has been photographed from an angle and perspective distortion needs to be considered.

Typical examples include:

• Floors

• Walls

• Tables

• Panels

• Roads

• Flat structural surfaces

Procedure

1. Select 3D Plane.

2. Place four points around the photographed plane.

3. Adjust the four points to match the actual plane boundaries.

4. Enter the required physical side dimensions.

5. Check the corrected plane using the Perspective Grid.

3.6 Perspective Grid

The Perspective Grid can be switched ON/OFF.

Without a 3D plane

The grid is parallel.

With a valid 3D plane

The grid follows the corrected perspective plane.

This provides a visual way to check the plane being used for perspective-aware measurement.

4.10 Advanced Shape Recognition

Purpose:

Automatically identify and measure contrasting shapes such as circles, ellipses, polygons, rectangles, and triangles from the image.

1. Open Advanced Features → Auto-Detect Shapes.

2. Select the required Shape Type.

3. Adjust Contrast Sensitivity until the shape is detected clearly.

4. Use Detect by Click and click on the shape for better identificataion, or use Detect All to scan the whole image.

5. Pscale identifies the shape and draws its measurement overlay on the image.

6. Adjust Contrast Tolerance for better detection. You can do thing even after selecting each shape

The detected shape and its calculated measurements appear in the Measurements List and can be adjusted like a normal measurement

4.11 Editing a Measurement

To adjust a measurement:

1. Select it.

2. Select the required point.

3. Move the point.

4. Release it at the desired position.

5. Pscale recalculates the data.

This is useful for refining measurements after zooming in.

5.1 Save Current Work

After completing measurements, use:

Save Current Work

This is different from exporting measurement results.

Saving is intended to preserve the project so that it can be continued later.

Saving Type :

Pscale uses a dedicated project/work file format:

.pscale

This is a Pscale project file rather than a normal image export.

It is intended to keep the original image together with the editable project information.

Continue an Existing Project :

Later, open Pscale and use:

Import Previous Work

Select the saved .pscale project.

Pscale restores the work so that the measurement process can continue.

This is useful when a project contains many carefully positioned points and references that would otherwise be time-consuming to recreate.

5.3 Export CSV

Use:

Export CSV

when you want the calculated measurement information in a spreadsheet-friendly format.

The exported information can include:

• Measurement ID

• Name

• Type

• Pixel dimensions

• Real dimensions

• Units

• Areas

• Angles

• Colors

• Coordinates

• Pixel information

• Measurement/reference mode

This is useful for further analysis, reporting, or record keeping.

Mouse Controls

Pan image

Hold left mouse button and drag on an empty area

Zoom in/out

Use the mouse wheel

Draw a measurement

Select a measurement tool, then click the required points

Finish a measurement

Complete the required number of points / click the starting point where applicable

Select a measurement/reference

Click its line, shape, or point

Move a point

Select the measurement/reference, then drag the desired point

Perspective reference

Place the four perspective points one by one

Move perspective point

Select the perspective reference, then drag an individual point

Edit a value

Click its value field in the Measurements section and type the value

Delete selected item

Select the item in Measurements, then use Delete Selected and confirm

Change reference color

Use the color control associated with the reference/side

Touch Controls

Pan image

Touch with two fingers and move both fingers together while keeping their distance approximately constant

Zoom in

Place two fingers and move them apart

Zoom out

Place two fingers and move them together

Draw a measurement

Use one finger only

Place a point

Touch with one finger, position it, then lift the finger — the release position becomes the point

Cancel point registration

If another finger touches the screen during point placement, the gesture becomes navigation and no point is registered

Select a measurement/reference

Tap it

Select a particular point

With the item selected, touch close to the desired point

Move a selected point

Keep your finger touching the point and move it; the point follows your finger

Commit moved point

Lift your finger; the point remains at its final position

Zoom while working with perspective points

Use two fingers; already registered perspective points are preserved

Switch between perspective points

Zoom/pan as needed, then touch the next point you want to move

Edit a value

Tap the value field and type

Delete selected item

Select it in Measurements → tap Delete Selected → confirm