PixelVeg — Plant Image Analyser

// Upload a plant image → press Start → indices calculated from all pixels

Cite as: [Hlubina, P., Uvackova, L.] (2026). PixelVeg: Plant Image Analyser (v1.0.0). Zenodo. https://doi.org/10.5281/zenodo.20179128

Image

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Upload a plant photograph to begin.
All pixels in the image will be averaged
and indices calculated from the mean colour.

Choose Image

Analysis Log 0 analyses

#	Colour	R	G	B	ExG	GLI	VARI	GEI	RGR
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Runs

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Last ExG

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Last GLI

Mean Pixel Colour

run analysis to see result

Red

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Green

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Blue

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Vegetation Indices

ExGExcess Green Index

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GLIGreen Leaf Index

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VARIVis. Atm. Resistant Index

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GEIGreen Excess Index

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RGRRed / Green Ratio

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Formula Reference

ExG — Excess Green Index

2·g − r − b

Emphasises green vegetation; correlates with chlorophyll. Range ≈ −1 to 1.

GLI — Green Leaf Index

(2·G − R − B) / (2·G + R + B)

Uses raw 0–255 values. Positive → green biomass.

VARI — Visible Atm. Resistant Index

(G − R) / (G + R − B)

Reduces lighting effects. Proxy for green vegetation fraction.

GEI — Green Excess Index

g − (r + b) / 2

Simple normalised version; easy to compute by hand.

RGR — Red / Green Ratio

R / G

Low → healthy green; high → stress or senescence.

Normalisation:
r = R/255 g = G/255 b = B/255
lowercase = normalised (0–1) · uppercase = raw (0–255)