Colour Blindness...

[X-ray]

@ Karlos

"...That movie was an arsefez for many reasons even before we get that far..."
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But, my good man, surely a fez can't be luminous blue? Even an arsefez worn by a Smurf has to be red, innit?  :-P

[Karlos]

@X-Ray

Thin ice, my friend, thin ice :evilgrin:

[adz]

Karlos wrote:

The biggest problems are seeing traffic lights at a distance. Until I'm close enough to observe the enclosure, its very difficult to tell which colour is on. At night, it can be difficut to even see a traffic light amidst all the normal lights etc on your typical highstreet.

I know from a distance I can't tell the difference between Red and Orange and at night green blends in with headlights and street lights.

[Karlos]

It put a crimp on my electronics hobby. Until I got a DMM, that is :-D

Pity I can't find the damn thing :lol:

[X-ray]

Did you see that news article about the painter who is (allegedly) completely colour-blind? They hooked up a camera to a laptop and converted all the visible wavelengths to sound frequencies. He aims the camera at a colour on his subject and the sound tells him which one it is. I thought that was pretty cool.

[Karlos]

For the really curious...

Sight is the product of the physical operation of the eye and the interpretation of that data by the visual cortex. It's impossible, really, to tell someone else how your visual perception interprets the world.

For myself, I can usually differentiate a strong (ie reasonably saturated) colour from the absence of colour (grey), but not one colour from another, unless its bluish. Unsaturated colours (unless blue) are hard to differentiate from grey.

A picture paints a thousand words, so with that, I spent a while trying to make an image process filter that converts unsaturated non blues to grey, passes some blue-greens and enhances the contrast of blues. It's not perfect by a long chalk as I can see the difference from the input and output, but the important thing is, it removes the distinction between colours I can't really perceive.

Lyme Hall as you 'normals' see it

Lyme Hall as I see it

[whabang]

It kinda looks like as if it was in the middle of the night, although much lighter.

[Karlos]

whabang wrote:
It kinda looks like as if it was in the middle of the night, although much lighter.

Your cone cells require much higher levels of light than the rods to be stimulated properly. Generally, everybody sees in greyscale in low enough light levels :-)

Karlos wrote:
For the really curious...

Sight is the product of the physical operation of the eye and the interpretation of that data by the visual cortex. It's impossible, really, to tell someone else how your visual perception interprets the world.

For myself, I can usually differentiate a strong (ie reasonably saturated) colour from the absence of colour (grey), but not one colour from another, unless its bluish. Unsaturated colours (unless blue) are hard to differentiate from grey.

A picture paints a thousand words, so with that, I spent a while trying to make an image process filter that converts unsaturated non blues to grey, passes some blue-greens and enhances the contrast of blues. It's not perfect by a long chalk as I can see the difference from the input and output, but the important thing is, it removes the distinction between colours I can't really perceive.

Lyme Hall as you 'normals' see it

Lyme Hall as I see it

It looks to me like when i've been wearing dark sunglasses in really strong sunlight and then gone in the shade and removed the sunglasses.

Very odd. :-)

[Doobrey]

Karlos wrote:
Generally, everybody sees in greyscale in low enough light levels :-)

Or if it's still daylight, a litre or two of homemade slivovitz has the same effect. :pint:

[Karlos]

The lack of colour perception for all those poncy earthy tones is more than made up for by some of nature's shades. Try these:

Some blue flowers

As I perceive them... (sort of - the filter wiped out the sky which looks quite blue to me)

[Karlos]

Doobrey wrote:

Karlos wrote:
Generally, everybody sees in greyscale in low enough light levels :-)

Or if it's still daylight, a litre or two of homemade slivovitz has the same effect. :pint:

:lol:

Try meths, it's cheaper*.







*disclaimer: this is a very stupid idea. You'll likey die or go blind at least ;-)

Karlos wrote:
The lack of colour perception for all those poncy earthy tones is more than made up for by some of nature's shades. Try these:

Some blue flowers

As I perceive them... (sort of - the filter wiped out the sky which looks quite blue to me)

Is this affliction something that can be seen as a genuine disability?

eg. Can you get one of those very useful blue disabled badges for your motor? ;-)

[Karlos]

In the DVLA application form, it lists visibility defects but expressly excludes colour blindness from that list.

Karlos wrote:
In the DVLA application form, it lists visibility defects but expressly excludes colour blindness from that list.

Ah well, at least it's comforting to know you aren't a danger on the roads then! ;-)

[Karlos]

@mdma

Actually it's more a case of the general level of non-understanding of how colourblind people see the world that means they don't allow it as a recognised impairment.

Most colourblind people have no difficulty in recognising traffic lights in normal lighting conditions. However, depending on the type (something that the DVLA in particular clearly have no understanding of - that there are types of colour disability) and severity of the dysfunction, it can be impossible to tell certian traffic signals apart.

I myself find red traffic lights very hard to see in bright conditions and all traffic lights are hard to distinguish from a distance under any lighting conditions where the enclosure itself is not obvious.