MrD wrote:
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There's a big difference between isolated colour pixels taken from an image (from DBS's example I see a cornflower blue and dark gold/brown colour) and his your brain reads it in context.
I trust the image directly. If you show me something and ask me what colours are in it, I'll tell you what colours are in it. I won't tell you that the colours in the image are wrong, because that would just be rude!
If you don't trust the image, then surely the image provides no information whatsoever and the objects can be any colour? It could be a green object lit by a strong blue light, or a flat coloured object lit by a striped light!
Do you really believe that? What colour is my dress in this picture, do you think?
Attachment:
violet.jpg
And what about this dress?
Attachment:
gold.jpg
Do you really only directly trust the colours in those images? They were both taken on the same day, and they are both of my wedding dress. It was neither blue, purple, brown or gold. Here is a photo from the same day, in daylight:
Attachment:
white.jpg
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My brain assumes that it is gold and white because I know from experience the effect of taking pictures of white objects facing away from the light source in pictures taken into a strong backlight, so my brain thinks this is what is happening here and so interprets the colours on the screen to probably be sometthing close to white and gold.
If you consider that the image has a strong background light, it makes even less sense to me:
There's strong white in the upper right. That upper-right white and the white of the dress are not the same brightness or hue: The dress
in the image can't be white.
There's strong black in the bottom left. That lower-left black and the black of the dress are not the same brightness or hue: The dress
in the image can't be black.
See, my brain assumes something else (and may be either right or wrong in the way that my brain interprets what my eyes is seeing, I honestly don't know. I think of cameras and the white balance thereof: so, you know that a lot of cameras can be either manually white-balanced, left on auto or set to react to certain lighting conditions (overact, sunny, tungsten and halogen lamps, a few others...) Some forms of artificial light think old lightbulbs and some energy saving ones, as well as sunlight) give off a warm light. The light is not white, but warm yellowish. This can sometimes give pictures a warm tone, which looks great in sunlight, but can look bad in artificial light. you can set your camera to compensate for this, and some will do it automatically, by cooling down the picture - it basically applies a blue cast to the image. The same can be done in reverse with a cold light source - blue artificial light can be compensated for in a camera's settings by the camera sensing that light and warming the image up.
If the phone cam is sensing a harsh warm artificial light it might be trying to downplay the overexposure by darkening the image, which will take effect in the foreground where the image is only backlit, and compensating for the warmth of the artificial over-warm light by cooling the image down.
This all processes in my head to explain the image, and it may be right, it may be wrong, but I think that's why I see it differently.
However, though I can see how the white in the image can look blue (though I would say a slightly dull cornflower blue, running into violet - not the royal blue shown everywhere) I cannot, even with the eyedropper tool, reconcile the other colour as being black. At best I can see a mid brown, not black at all, so maybe screen differences play some part too.
But really, as in the pics of my wedding dress, I don't think the colour isolation idea really gives much useful information.