Distinguishing colours

zulupentax

zulupentax

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Amin
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Yes
Does the colour of square A look the same as square B in your monitor? Or does it look different? Or even looking through a different angle it changes the perception etc etc. Various variables in play here so please throw in your thoughts. This could be fun :)

For those who haven't seen this one, you might look really surprised in the end.
I am not going to reveal it right now, but a bit later on so members can have a good look at it and throw in some suggestions and answers.

I am ready to consider other replies also besides "yes" or "no" so please give your imagination a spin :)

perception.jpg
 
birdy961 said:
If I tilt my lappy screen towards me then eventually they both look the same, other than that No they are different

Do I win:lol:
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:) check this out.
For members just reading this I would suggest trying to guess first and then opening the pps file, you will be stunned.
Oh by the way, the pps is in portuguese but you will get the idea by just going through the images :)

http://www.aminstar.com/pentaxforums/Percepcao.pps
 
It's a "relative contrast" illusion, both colours are identical. Goes to show how much processing your brain lays over what's in front of you :) What's interesting is if you put a ruler or finger between the squares, you can see they're the same, but your brain does a backflip as you slide the ruler out of the way, no matter how hard you fight it :)

Another interesting test is here:
http://www.xrite.com/custom_page.aspx?PageID=77&Lang=en

Critiques concerning colour should have this as a Captcha ;)
 
Thats good, a new take on the "are these lines straight ?" type question.

I assume therefore we notice contrasts more than relative brightnesses?

I've just used a hole punched piece of paper to look at a circle of each in isolation if anyone else wants to try.
 
Easier test even is just use the eye dropper in the image editor to check the colours of A and B.
Well I had to do it just to put my brain at east :) even after reading that the colours were the same lol
 
Easier test even is just use the eye dropper in the image editor to check the colours of A and B.
Well I had to do it just to put my brain at ease :) even after reading that the colours were the same lol
 
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Forbiddenbiker said:
Stop it willl ya, since when has grey been a colour. :thinking:
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Ok, apologies, my mistake wording it.
I will rephrase it, "what shade of grey is it then, same or different."
Does that sound more accurate technically.
Hey, I am just a newbie, so cut me some slack will ya ;)

Still grasping this whole concept of photography, light and colours, ooops shades of grey I meant :lol:
 
Forbiddenbiker said:
Stop it willl ya, since when has grey been a colour. :thinking:
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Grey is a coulour (or a combination of the three primary colours in equal but somewhat low intensities). Only black is an absence of colours.
 
zulupentax said:
Ok, apologies, my mistake wording it.
I will rephrase it, "what shade of grey is it then, same or different."
Does that sound more accurate technically.
Hey, I am just a newbie, so cut me some slack will ya ;)

Still grasping this whole concept of photography, light and colours, ooops shades of grey I meant :lol:
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lol ... your not a newbie, you've been here ages.

Im gonna disagree with daugirdas now anyway so your off the hook. :D

daugirdas said:
Grey is a coulour (or a combination of the three primary colours in equal but somewhat low intensities). Only black is an absence of colours.
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For me, as pure black is without light being reflected and pure white is all light being reflected....everything in between is the amount of white light being picked up by the eyes rods and cones in equal amount ensuring that we don't see any colour only a balanced mix of greys.

If the amounts of colours in the light are equal then any colour present is invisible to our eyes .... It may contain colour but we don'tsee any, hence grey is not a colour.
 
Forbiddenbiker said:
lol ... your not a newbie, you've been here ages.

Im gonna disagree with daugirdas now anyway so your off the hook. :D




For me, as pure black is without light being reflected and pure white is all light being reflected....everything in between is the amount of white light being picked up by the eyes rods and cones in equal amount ensuring that we don't see any colour only a balanced mix of greys.

If the amounts of colours in the light are equal then any colour present is invisible to our eyes .... It may contain colour but we don'tsee any, hence grey is not a colour.
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Goodness me Adam, you totally and utterly lost me there :)
With that scientifically detailed explanation you absolutely got my head spinning, and I ended up where I started.
So should I consider grey a colour or not?

Oh by the way, I am a newbie :), can't you see I am still confused even about the grey? :)
 
Yes i can see you are :D

Some bullet points that may or may not help. lol

Energy coming from the sun called the electromagnetic spectrum contains energy and part of that spectrum is known as visible light. (which means the energy humans can see) This visible light spectrum (think rainbow) does not contain any white.

The light and colours we see on objects with our eyes is reflected light, its light bouncing back from the objects surface... different surfaces at the atomic level will reflect different parts of the spectrum back to our eyes....resulting in different surfaces reflecting different colours.

For instance, when sunlight falls onto a leaf the only colour we can see reflected back is green ...this is because the leaf has absorbed all parts of the white light leaving only the green to be reflected back. or a white surface is a surface which reflects all of the light back and a black surface non of the light bounces back.

Greys are simply lowering intensity’s of pure white light until eventually no light is reflected and you get pure black… I mean if you can’t see any colour then its fare to say you can’t see any colour. Init.

So no, in my opinion grey is not a colour.

I’m pretty sure you gonna say I've added to your confusion but heck I really enjoyed writing that.
 
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Forbiddenbiker said:
Yes i can see you are :D

Some bullet points that may or may not help. lol

Energy coming from the sun called the electromagnetic spectrum contains energy and part of that spectrum is known as visible light. (which means the energy humans can see) This visible light spectrum (think rainbow) does not contain any white.

The light and colours we see on objects with our eyes is reflected light, its light bouncing back from the objects surface... different surfaces at the atomic level will reflect different parts of the spectrum back to our eyes....resulting in different surfaces reflecting different colours.

For instance, when sunlight falls onto a leaf the only colour we can see reflected back is green ...this is because the leaf has absorbed all parts of the white light leaving only the green to be reflected back. or a white surface is a surface which reflects all of the light back and a black surface non of the light bounces back.

Greys are simply lowering intensity’s of pure white light until eventually no light is reflected and you get pure black… I mean if you can’t see any colour then its fare to say you can’t see any colour. Init.

So no, in my opinion grey is not a colour.

I’m pretty sure you gonna say I've added to your confusion but heck I really enjoyed writing that.
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Nice one Adam :)

Sorry I thought you had detected a pinch of cheeky tone in my remark ;)
but it was nice of you to jolt it down, :).

But I still insist, in my view grey is a colour. In order for our vision to view it and the mind to interpret and absorb it the grey tonality even though doesn't reflect any colour from the same spectrum as the whites, it is still a colour.
Neurologically our brain looks at it and interprets it in exactly the same way as any other colour, so from the biological perspective it is a colour :)
 
oh that just annoyed me. its perfectly acceptable to comprehend but i cant get my brain to see them as the same shade. arrrgh!
 
I did spot your cheeky tone but then though maybe yor just a bit daft (its ok I am too) so I thought Id throw it back and see .... :D

I didn't feel like I knew you enough to go for the full on below-the-belt stuff.

I will from now on though.

Ps, Your talking rubbish. Grey is not a colour.

Goitta go now ...taxies turned up ... :wave:
 
Forbiddenbiker said:
I did spot your cheeky tone but then though maybe yor just a bit daft (its ok I am too) so I thought Id throw it back and see .... :D

I didn't feel like I knew you enough to go for the full on below-the-belt stuff.

I will from now on though.

Ps, Your talking rubbish. Grey is not a colour.

Goitta go now ...taxies turned up ... :wave:
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But if grey contains red blue and green then it has colour, just in equal amounts. ;)
 
swanseamale47 said:
But if grey contains red blue and green then it has colour, just in equal amounts. ;)
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Wayne, he has taken a taxi and gone to the pub. He won't be back until wee hours of the morning and also will be totally greyed when he comes back :lol:
Will have to wait until late today to hear his points with regard to your views ;)
But I will be eagerly awaiting for it, am getting used to the high level explanations now :). My mind has sobered up from last night drinks so I am quite capable of following them up :)

Forbiddenbiker said:
I did spot your cheeky tone but then though maybe yor just a bit daft (its ok I am too) so I thought Id throw it back and see .... :D

I didn't feel like I knew you enough to go for the full on below-the-belt stuff.

I will from now on though.

Ps, Your talking rubbish. Grey is not a colour.

Goitta go now ...taxies turned up ... :wave:
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Adam we will be waiting for you mate :)
 
Seen it before.

Didn't believe it then, don't believe it now.
Even when I opened it in Photoshop, Photoshop lied to me. :p
 
Forbiddenbiker said:
Lol .... and Ive been to a job this morning too. :p urgggh! me head!


I've got the perfect example for you lot that will clear this up for good.

Get you kids paints out and mix those primary colours and tell me when you've made white. :D
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Adam, I have had too much to drink today already so I will pass that one on :).
I will go with your theory, for now :)

Marcel said:
Seen it before.

Didn't believe it then, don't believe it now.
Even when I opened it in Photoshop, Photoshop lied to me. :p
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Marcel, I know what you mean mate, same here, I already sent a complain to Adobe saying my version of photoshop has a bug :lol:
 
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