11.6: Scales and rulers

The Introduction to the Forensic Sciences · LibreTexts

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    From LibreTexts, under CC BY-SA 4.0, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    It is important to select a scale or ruler that will be visible under the particular wavelength you are using but should not fluoresce over the image you are photographing. It may be necessary to use a very low-powered white light (45 lumens) to “paint” the scale momentarily while the shutter is open. Be careful not to introduce the white light onto the item of evidence.

    3 scales with fiducial symbols
    Scale that fluoresces in the red-
    Figure \(\PageIndex{1a/b}\): Various scales including a fluorescent scale that "bleeds" over the image. Author's collection

    This page titled 11.6: Scales and rulers was last modified on Sun, 25 Jan 2026 01:27:44 GMT and is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by David Doglietto.