Find the measurement behind the colour
NASA explains that true-colour images use visible red, green and blue wavelengths, while false-colour images can include wavelengths outside human vision. Those measurements are assigned visible display colours. The word false describes the colour mapping; it does not mean the underlying observations were invented.
A colour’s meaning depends on the chosen combination. A mapping useful for vegetation may differ from one designed to distinguish burn scars, clouds or minerals. Do not transfer a colour key from one image to another without checking.
Read the caption before the landscape
Look for the satellite or instrument, acquisition date, band combination and purpose. NASA’s detailed false-colour explainer gives examples of assigning different measured bands to the display’s red, green and blue channels. The caption can therefore explain why a familiar landscape looks unfamiliar and which features the image is intended to distinguish.
If a television graphic removes the caption, follow its NASA or instrument credit to the original image page. Preserve that page rather than saving only an unlabelled screenshot.
Keep different transformations separate
False colour, a multi-date composite, a map projection and a time-lapse are different operations. One image can involve more than one. A colourful globe may combine observations over time, while a single scene can show one acquisition with a non-visible band. Ask about colour, time and geometry separately.
Similarly, an illustrated animation of a satellite is not the same kind of evidence as measured imagery. The programme’s transition between them may be visually smooth even though their evidential roles differ.
Describe only what the key supports
Use language such as this image assigns infrared measurements to visible colours, followed by the specific feature explained in the source caption. Do not infer an exact surface temperature, chemical concentration or hazard level from colour alone unless the product supplies a suitable scale and interpretation. For a comparison, check that both images use comparable bands, dates and processing. Keeping the original caption with a shared image lets other viewers evaluate the measurement instead of treating a striking colour as self-explanatory.
Related questions
Does false colour mean a fake image?
No. It can represent real measurements using assigned visible colours.
Does red always mean heat?
No. Read that image’s band mapping or legend.
Sources and scope
Scope notes distinguish published documentation, supplied information and editorial methods. They do not report a hands-on service test.
- NASA: interpreting false-colour imagery — Explains band-to-colour mappings and why they differ.
- NASA: interpreting satellite images — Distinguishes visible-light and false-colour imagery and contextual reading.
