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#uvphotography

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Erik<p>While working on more multispectral images, I noticed the ethereal blue <a href="https://fosstodon.org/tags/fluorescence" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>fluorescence</span></a> of these flowers under ultraviolet light. </p><p>This was done with 10 seconds of light painting with a 365nm UV flashlight, captured using an unmodified mirrorless camera. </p><p><a href="https://fosstodon.org/tags/uvphotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>uvphotography</span></a> <a href="https://fosstodon.org/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a> <a href="https://fosstodon.org/tags/macrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>macrophotography</span></a></p>
Erik<p>A false-color <a href="https://fosstodon.org/tags/multispectral" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>multispectral</span></a> photo I took of a larkspur with UV and IR light mapped on top of a regular visible-color photo. Inner parts of the flower petals reflect more UV than others and thus show up in blue. Other parts absorb UV but reflect IR, resulting in the red colors seen in the inner part of the flower and stems. Many flowers use this contrast to help pollinators (who often can see UV) to distinguish key parts of the flower.</p><p><a href="https://fosstodon.org/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a> <a href="https://fosstodon.org/tags/uvphotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>uvphotography</span></a> <a href="https://fosstodon.org/tags/infraredphotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>infraredphotography</span></a></p>
Erik<p>Latest <a href="https://fosstodon.org/tags/multispectrum" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>multispectrum</span></a> image, showing what a flower might look like if we saw beyond visible light into the UV and IR spectra. </p><p>I’ve mapped IR light to red and UV light to blue, and added them to the existing red and blue data from the ordinary RGB image (included for comparison). Notice how the spots on the petals reflect IR light (and thus glow red), and how outer parts of the petals reflect more UV (blue).</p><p><a href="https://fosstodon.org/tags/IRphotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>IRphotography</span></a> <a href="https://fosstodon.org/tags/photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>photography</span></a> <a href="https://fosstodon.org/tags/UVphotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>UVphotography</span></a></p>
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