Talk:Ishihara color test

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This test, aside from its scientific value, has long been applied to institute kinds of social discriminations in Japan, and probably in other countries as well, throughout the 20th century. Particularly before 1950s, those who failed to pass this tests were excluded from engineering schools, military services, and other professions considered needing the ability to differentiate colors. It was a celebrated story that one of the kins of the fiancee of the late Emperor was found to be colorblind, as the test was first applied to the students of the royal school. In spite of the rampant objections within the royal household raised against the marriage, since the colorblindness became known to be hereditary, the Emperor persisted to fulfill the engagement. He was long praised for the decision, and the episode contributed greatly to remove the baseless discrimination caused by the wrong way of application of the test.

Does anyone else find the image here extremely confusing within the context of the article? I imagine it's supposed to in some way represent the 'hidden' figure in a test panel (useful for those who cannot see it), but as it is here it's not explained and just seems generally cryptic. Would a person who has not seen or taken the actual test be able to understand what this image is attempting to show? Somehow I doubt it. - Rankler 14:16, 15 May 2005 (UTC)

I agree. The image and explanation are confusing. I'm also made more skeptical by the source description - self made on photoshop. Also, I know that I am red-green colour blind yet I still see exactly the same image as a friend (who isn't) described when he saw it. If the poster cannot justify the scientific validity of the test I propose it be removed. Perhaps we could email a site dedicated to CB and ask to use an image... Thick as a Planck 8:22, 14 November, 2005 (UTC)

The image would appear to be useles at proving the usefulness of the test, and worse seems to propagate the common miconception that red-green blindness sufferers are completely unable to distinguish between the two. Taken from the Wikipedia page Color blindness - "Color blindness is not the swapping of colors in the observer's eyes. Grass is never red, stop signs never green. Distinguishing a Granny Smith from a Braeburn is not a problem. The color impaired do not learn to call red "green" and vice versa.".

Based on this, I suggest that the image is removed and replaced with a more suitable replacement. --134.220.85.139 11:51, 23 November 2005 (UTC)

As many have noted this picture is faulty, so I took it out. 11:52, 8 March 2006 (UTC)

[edit] Example images

Are these any use?

It should be possible to see the digit "2" in both images if you're not colourblind. I need someone to check this for me though, because I can't see anything in the one on the left. -- Sakurambo 14:53, 21 May 2006 (UTC)

Yep the "2" is visible in both images. It's a little tricky to see in the left one but it's definitely there. -- Laura S | talk to me 20:10, 21 May 2006 (UTC)

Hi Laura, thanks for the feedback. I've uploaded another version of the colour image with a bit less "noise". Is it clearer now? You might need to do a hard refresh (control-F5?) to see the new version. And by the way, would you say the "2" in the colour image is subjectively lighter or darker than the background? I was wondering if the grey version should perhaps be the other way round... -- Sakurambo 21:41, 21 May 2006 (UTC)

Actually I think it's harder to see now. I can try to work on it to give it a little more contrast, but probably won't have time to do it for a few days. -- Laura S | talk to me 00:43, 22 May 2006 (UTC)

Here's version 3. Any better? -- Sakurambo 10:10, 22 May 2006 (UTC)

Increadbly clear to me, with this version.--Clawed 10:20, 22 May 2006 (UTC)

Agreed, I'm on a laptop now so different screen, but this one does seem a lot clearer. -- Laura S | talk to me 12:43, 22 May 2006 (UTC)

Many thanks for your feedback. I've just updated the article. -- Sakurambo 09:17, 23 May 2006 (UTC)

I think it is a good idea to put both images on the front page instead of just providing a link to the second image. When the two images are on the same page, the readers will be able to compare them more easily. —The preceding unsigned comment was added by 203.84.191.122 (talk) 06:22, 16 February 2007 (UTC).

I am red-green color blind, and I see the "2" in both images. For the image in the article, I see "21." Might it be possible to illustrate what I would see versus what a person with healthy eyes would see? I'm not sure how to do that, really. I've always wondered where the 74 shows up, for example. -- Tckma 02:23, 27 March 2007 (UTC)

Some of the external links on the page Color blindness provide free software that can be used to adjust images to simulate how the images would appear to people with different color deficencies. I'm just starting to look into this software, but the Vischeck program seems interesting. Straha 206th 21:32, 16 July 2007 (UTC)

[edit] Current Image on the page

1. The current image (Feb 26, 2008): I am red-green colorblind, and can see nothing but dots. That is not what the caption says.Ratagonia (talk) 00:57, 27 February 2008 (UTC)

2. if this is an image from the (official?) Ishihara color test, can we specify which one?Ratagonia (talk) 00:57, 27 February 2008 (UTC)

3. Is the Ishihara color test a 'style' of test, rather than a specific set of examples?

Ratagonia (talk) 00:57, 27 February 2008 (UTC)

[edit] Constructing the designs

How are the "patterns and colours of dots" selected so that they present the various different numerical/non-patterns? (For these or "any other similar designs.") Jackiespeel (talk) 21:33, 20 April 2008 (UTC)