Calibrate an Image and Add an Accurate Scale Bar

Import your microscopy image, choose or create a calibration, crop or improve the image if needed, then add a readable scale bar and export the final figure.

Import → Calibration → Edit → Scale & Export

Beginner 2-5 minutes
Start with Scale Workflow Watch 30-second workflow
Best for Adding an accurate scale bar to a microscopy image before export.
Input SEM, TEM, optical microscopy, PNG, JPG, TIFF
Required A known calibration, saved calibration, or visible reference scale.
Optional Crop or improve the image in the Edit step before final export.
Output A clean exported image with an accurate and readable scale bar.
Estimated time 2-5 minutes

Before you start

Make sure your image has at least one reliable scale reference. This can be an existing scale bar, a saved calibration, or a known pixel-to-unit ratio. If the image is already calibrated, you can skip calibration setup and continue to Edit or Scale & Export.

  • Microscopy image is ready
  • Calibration reference is available
  • Output format is selected
  • Crop or image cleanup is only used when needed

See the workflow in 30 seconds

This short video shows the full path: import the image, select or create calibration, crop or improve the image, add the scale bar, and export the final result.

What you will learn

  • Where to start
  • When calibration is required
  • When to use Edit
  • How to export the final image

Workflow Steps

1

Import your microscopy image

Upload, drag and drop, or choose a microscopy image from your library. If the image already contains a visible scale bar, keep it available for calibration.

InputSEM, TEM, optical microscopy, PNG, JPG, TIFF
Actionupload, drag & drop, or choose from library
Resultimage is ready for calibration
2

Select or create calibration

Choose an existing calibration or create a new one from a known reference. NotyScale uses this calibration to convert pixels into real units such as nm, µm, mm, cm, or m.

Inputimage + calibration reference
Actionselect calibration or create a new one
Resultpixel-to-unit scale is ready

Without calibration, the scale bar may be only visual, not scientifically meaningful.

3
Optional step

Crop or improve the image if needed

Use Edit only when the image needs preparation before export. You can crop unnecessary borders, improve the final image dimensions, and use NotyCheck-related improvements when available.

Inputcalibrated image
Actioncrop, resize, improve dimensions, or run available checks
Resultcleaner image prepared for final scale bar placement

If your image already looks clean, skip Edit and go directly to Scale & Export.

4

Add scale bar and export

Add the final scale bar using the active calibration. Adjust the scale bar length, position, style, color, and label readability, then export the image as PNG or JPG.

Inputcalibrated and prepared image
Actionadd scale bar, adjust style, export
Resultfinal image with accurate scale bar
Before export
  • Scale bar length is meaningful
  • Label is readable
  • Bar position does not cover important image features
  • Export size is suitable for paper, slide, report, or documentation

When should you use the Edit step?

Use Edit when the image needs cleanup before the scale bar is added.

Use Edit if

  • The image has extra borders or empty margins.
  • The image needs a cleaner crop for publication.
  • The image dimensions are not suitable for export.
  • You want to improve export readiness with NotyCheck-related checks.

Skip Edit if

  • The image is already cropped.
  • The image quality is acceptable.
  • You only need calibration and a scale bar.

Recommended settings

For SEM/TEM images

  • Use µm or nm depending on magnification.
  • Place the scale bar in a low-detail corner.
  • Use white scale bar on dark images and dark scale bar on bright images.

For reports and slides

  • Export as PNG when quality matters.
  • Use JPG only when smaller file size is more important.
  • Keep the label readable at final export size.

For publication-style figures

  • Crop before adding the final scale bar.
  • Keep scale bar style consistent across related images.
  • Use the same preset when preparing multiple images from the same project.

Common mistakes this workflow helps prevent

Adding a scale bar before calibration

Prevention: Select or create calibration before adding the final scale bar.

Cropping after adding the scale bar

Prevention: Crop first, then add the final scale bar.

Using a scale bar that is too long or too short

Prevention: Choose a scale bar length that is easy to read and visually proportional to the image.

Placing the scale bar over important image features

Prevention: Place it in a clean corner or low-information area.

Exporting with unreadable labels

Prevention: Check label size, contrast, and background before export.

Expected output

Before

Raw microscopy image with old scale context, unnecessary borders, or no final scale bar.

After

Cropped or cleaned microscopy image with a readable and accurate scale bar.

Export-ready for

Reports, lab notes, scientific slides, manuscripts, documentation, and tutorials.

Frequently asked questions

Do I need calibration before adding a scale bar?

Yes. For an accurate scientific scale bar, the image must have a known calibration or reference.

Can I skip the Edit step?

Yes. If your image is already clean and properly cropped, you can go from Calibration directly to Scale & Export.

Should I crop before or after adding the scale bar?

Crop before adding the final scale bar. This helps keep the scale bar position and readability consistent in the exported image.

Can NotyCheck improve the image during this workflow?

Use NotyCheck-related checks or improvement options when the image needs better export readiness, cleaner dimensions, or quality review.

What format should I export?

Use PNG for best visual quality. Use JPG when you need a smaller file size.

Ready to calibrate and export your image?

Start with your microscopy image, select calibration, edit only if needed, then add a clean scale bar and export.

Start with Scale Workflow Watch 30-second workflow