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What is DOI? (Distinctness of Image)

DOI or Distinctness Of Image is, as the name implies a function of the sharpness of a reflected image from a surface.

Painted surfaces finished with similar coatings may produce identical gloss values when measured using a glossmeter however when visually assessed the quality of one surface against the other may be seen to be better than the other. Typically upon closer inspection the visually different surface will contain a degree of Orange Peel causing the reflection to become fuzzy and distorted.

doi panels

The images above demonstrate this measured versus visual difference, all surface measure identical gloss values however visually they appear different due to varying levels of Orange Peel present.

The DOI value of a surface is a number between zero and one hundred; a surface that reflects a perfect undistorted image returns a value of 100, as the value decreases the image quality deteriorates.

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Rhopoint Novo-Curve 4 Product Image with text

Novo-Curve 4 Glossmeter

  • Benchtop glossmeter, Measures at 60°
  • Suitable for both curved & flat surfaces
  • Precise measurement of small areas & irregular shapes
  • Custom adaptor jigs available
  • To ensure accurate and reliable results, the Novo-Curve 4 Glossmeter is supplied with standards calibrated and certified according to ISO 17025 UKAS

Novo-Gloss 45 Glossmeter

  • 45° glossmeter for all gloss applications
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  • Full colour easy to read screen
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What is DOI? (Distinctness of Image)