pixels and pictures
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Exploring the digital imaging chain from sensors to brains
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This photo of some strawberries with no red pixels is the new 'the dress'

This photo of some strawberries with no red pixels is the new 'the dress' | pixels and pictures | Scoop.it

Remember internet kerfuffle that was 'the dress' ? Well, there's another optical illusion that's puzzling the internet right now. Behold: the red strawberries that aren't really red. Or more specifically, the image of the strawberries contains no 'red pixels.'

The important distinction to make here is that there is red information in the image (and, crucially, the relationships between colors are preserved). But despite what your eyes might be telling you, there are no pixels that appear at either end of the 'H' axis of the HSV color model. i.e. there is no pixel that, in isolation, would be considered to be red, hence: no 'red pixels' in the image.

 

So it's not that your brain is being tricked into inventing the red information, it's that your brain knows how much emphasis to give this red information, so that colors that it would see as cyan or grey in other contexts are interpreted as red here.

 

As was the case with 'the dress,' it all relates to a concept called color constancy, which relates to the human brain's ability to perceive objects as the same color under different lighting (though in this case there are unambiguous visual cues to what the 'correct' answer is).

 

Philippe J DEWOST's insight:

No "red pixel" has ever been added to this image and they are not "invented" by your brain either. Funny enough, our human white balancing capabilities go way beyond cameras "auto white balance" mode...

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This blue sunset is what @elonmusk will see if he reaches Mars

This blue sunset is what @elonmusk will see if he reaches Mars | pixels and pictures | Scoop.it

NASA's Curiosity Mars rover recorded this view of the sun setting at the close of the mission's 956th Martian day, or sol (April 15, 2015), from the rover's location in Gale Crater.

This was the first sunset observed in color by Curiosity. The image comes from the left-eye camera of the rover's Mast Camera (Mastcam). The color has been calibrated and white-balanced to remove camera artifacts. Mastcam sees color very similarly to what human eyes see, although it is actually a little less sensitive to blue than people are.

Dust in the Martian atmosphere has fine particles that permit blue light to penetrate the atmosphere more efficiently than longer-wavelength colors. That causes the blue colors in the mixed light coming from the sun to stay closer to sun's part of the sky, compared to the wider scattering of yellow and red colors. The effect is most pronounced near sunset, when light from the sun passes through a longer path in the atmosphere than it does at mid-day.

Philippe J DEWOST's insight:

This beautiful color sunset captured on Mars by Curiosity a month ago is what @elonmusk would like to contemplate in person.

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Antelope Colors

Antelope Colors | pixels and pictures | Scoop.it
Antelope Canyon is amazing when visited around (solar) noon time
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Lennon's 'Imagine' as seen and painted by Synesthetic Artist @melissamccrack en

Lennon's 'Imagine' as seen and painted by Synesthetic Artist @melissamccrack en | pixels and pictures | Scoop.it

As she writes : "But the most wonderful "brain malfunction" of all is seeing the music I hear. It flows in a mixture of hues, textures, and movements, shifting as if it were a vital and intentional element of each song.
Having synesthesia isn't distracting or disorienting. It adds a unique vibrance to the world I experience."

Philippe J DEWOST's insight:

Wondering whether I prefer the song or its synesthetic painting

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Extremely Rare Color Photography of Early 1900s Paris

Extremely Rare Color Photography of Early 1900s Paris | pixels and pictures | Scoop.it

Although some of these images might look like a modern day photography and some of them like painted pictures, actually it is real colored photographies, taken at the beginning of the 20th century Paris (France).


It is extremely astonishing to look at the world now long gone, the world which you are used to see in black & white images and often with poor quality.


All the images shown were taken using Autochrome Lumière technology. It's an early color photography process, patented in 1903 and invented by the famous French Auguste and Louis Lumière, populary known as Lumière Brothers.

Philippe J DEWOST's insight:

Who said "The City of Light" ?

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