Results 1 to 8 of 8

Thread: Another White&Gold vs Black&Blue Dress Fiasco

  1. #1
    Join Date
    Jul 2008
    Posts
    768

  2. #2
    Join Date
    Mar 2015
    Location
    Cambridgeshire, England
    Posts
    478

    Default

    They look green to me as well; as I do suffer with protanomaly, shouldn't my brain be adding in more of the missing red?

  3. #3
    Join Date
    Mar 2012
    Location
    Akron, Ohio USA
    Posts
    2,197

    Default

    Quote Originally Posted by dchammonds View Post
    https://www.msn.com/en-us/kids/scien...cid=spartandhp

    Those strawberries look green to me, but the article suggests otherwise...


    https://en.wikipedia.org/wiki/The_dress


    I don't see any red either.
    Creator of LaserBoy!
    LaserBoy is free and runs in Windows, MacOS and Linux (including Raspberry Pi!).
    Download LaserBoy!
    YouTube Tutorials
    Ask me about my LaserBoy Correction Amp Kit for sale!
    All software has a learning curve usually proportional to its capabilities and unique features. Pointing with a mouse is in no way easier than tapping a key.

  4. #4
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,478

    Default

    ... seems to depend on white-balancing and ambient colouring.

    When "accomodating" my vision, I can see some "yelowish" colours ...

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  5. #5
    Join Date
    Mar 2012
    Location
    Akron, Ohio USA
    Posts
    2,197

    Default

    There is something I notice all the time when I'm working on a painting. If I put colors next to each other they look different depending on the combinations. Blue next to red looks different than next to yellow and so on.
    Creator of LaserBoy!
    LaserBoy is free and runs in Windows, MacOS and Linux (including Raspberry Pi!).
    Download LaserBoy!
    YouTube Tutorials
    Ask me about my LaserBoy Correction Amp Kit for sale!
    All software has a learning curve usually proportional to its capabilities and unique features. Pointing with a mouse is in no way easier than tapping a key.

  6. #6
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,890

    Default

    Quote Originally Posted by james View Post
    There is something I notice all the time when I'm working on a painting. If I put colors next to each other they look different depending on the combinations. Blue next to red looks different than next to yellow and so on.

    I have "normal" vision and I just see Green Strawberries with blue background.


    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  7. #7
    Join Date
    Oct 2011
    Posts
    196

    Default

    Yeah only blue and green shows up. The heck? Maybe the guy uploaded the wrong picture or something.

    EDIT: here's a better picture https://www.illusionsindex.org/i/grey-strawberries

    Now although they say there's no red there actually is. You need red blue and green to make greys. that specific grey is
    red 166
    green 182
    blue 181
    So when you see the cyan, the red in the grey stands out. That's my take on it
    Last edited by Shadow; 09-04-2019 at 12:05.

  8. #8
    Join Date
    Aug 2013
    Posts
    73

    Default

    Quote Originally Posted by Shadow View Post
    Yeah only blue and green shows up. The heck? Maybe the guy uploaded the wrong picture or something.

    EDIT: here's a better picture https://www.illusionsindex.org/i/grey-strawberries

    Now although they say there's no red there actually is. You need red blue and green to make greys. that specific grey is
    red 166
    green 182
    blue 181
    So when you see the cyan, the red in the grey stands out. That's my take on it
    Well, sort of. The image only 'contains red' in an RGB representation. What matters is the relative tristimulus values of the different colors in the image, and there are an infinite number of spectra that can result in any given set of tristimulus values*. You could mix up arbitrary pigments or wavelengths to get to a tristimulus ratio equivalent to the RGB color in the image and get the same effect. Tristimulus values are related, but not equivalent, to RGB values: Red, green, and blue make good primaries because they provide a gamut that covers most of the human visual range, but in terms of spectral colors, these do NOT correspond to the peak sensitivities of the color receptors in the human eye, which actually have fairly complex sensitivity spectra, meaning that the RGB representation of a color does not have a direct correspondence with that color's tristimulus values. (Actually, you'd need to specify *which* RGB representation, since there are many based on different primaries. Fun fact: many color spaces actually use as their primaries imaginary colors that the human eye can never perceive, because they make for a wider gamut than any set of three 'real' colors ever could)

    * Except for those colors that lie on the spectral locus (monochromatic colors), for which there is exactly one spectral distribution (all of the photometric power concentrated in a single wavelength).

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •