Why does an increase in Y-chain contrast cause apparent desaturation?

And is this the same phenomenon we see when colors appear less saturated in the middle of the day compared to dawn and dusk (when the contrast of brightness is reduced)?

The button passes the contrast test, but the bottom of the button and that of the div are not very contrasted

It passes the contrast test because it considers the white text on the background of the button. As such, the contrast is good. If you want to contrast the button with the background, then you will need to look at the background of your button relative to the background of the container. For example, by running your sample labeled as 7 on the WebAIM contrast tester, I get it fails the test, with the result Contrast ratio: 2.1: 1

It is true that there are no rules about it, so you will have to test it. In addition, it is possible that you are confronted with the very common puzzle flat design: You can not distinguish a button from other items. If this is the case, a better way to distinguish the buttons is to use shadows and a shape. A rounded corner with a shadow will indicate that it is a button and most users will understand it at first glance.

One thing to consider is that for accessibility requirements, there is nothing in the container against the block elements in WCAG2. See below:

1.4.3 Contrast (minimum): The visual presentation of text and text images has a contrast ratio of at least 4.5: 1, with the exception of
next: (level AA)

Broad Text: Large-scale text and large-scale text images have a contrast ratio of at least 3: 1;

Incidental: Text or text images that are part of an inactive user interface component, which are pure decoration, which are not
visible to anyone, or part of an image containing
other important visual content, does not require contrast.

Logotypes: text that is part of a logo or brand name does not require minimum contrast.

1.4.4 Resize text: With the exception of captions and text images, text can be resized without assistive technology up to 200% without loss of text.
content or functionality. (Level AA)

1.4.5 Text Images: If the technologies used can allow visual presentation, the text is used to convey information rather than
text images except for the following: (Level AA)

Customizable: the image of the text can be customized visually according to the needs of the user.

Essential: A particular text presentation is essential to the information conveyed.

Note: logos (text that is part of a logo or brand name) are
considered essential.

1.4.6 Contrast (enhanced): The visual presentation of text and text images has a contrast ratio of at least 7: 1, with the exception of
next: (level AAA)

Large Text: The contrast ratio of at least 4.5: 1 is large for text and large images.

Incidental: Text or text images that are part of an inactive user interface component, which are pure decoration, which are not
visible to anyone, or part of an image containing
other important visual content, does not require contrast.

Logotypes: text that is part of a logo or brand name does not require minimum contrast.

If you opt for accessibility (which seems to be the case and it's great!), You really do not need to contrast the buttons. in itself, the contrast should be in the text. However, it's a good idea to bring them out if you want users to actually see the buttons (so … click on it).

usability – Is high contrast mode really useful?

After a brain injury, I had more and more visual difficulties. Initially, the inflammation changed the shape of my eyes and made the pictures blurry. A larger font was useful.

Then, as my symptoms progressed, I began to have a lot of trouble distinguishing the ads from the articles. I've blocked all the websites that ran ads in the article text or that required pressing a button to make a "page" between the screens.

Retinal tears (torn from the back of the eye) developed in both eyes. The tears were small at first, but caused a "black snow storm" of blood cells blocking my eyesight. A high contrast first helped me see through the "snow", but as the tear of the retina progressed and the blood flowed, I could not see it. I need low contrast and low light so that less light is reflected on parts of my retina.

The lenses in my eyes began to get cloudy a few months after the retinal reattachment surgery. In the months before my replacement of the lenses in my eyes, it was impossible for me to read white and shiny screens because of the glare, and a glossy text on a dark background was even worse. The best solution I found was to find the lowest possible contrast with the larger fonts and I had to adjust my monitor as dark as possible, which allowed me to navigate the computer, but I end up copying all the text from my computer to my Kindle. where the lighting of the room controlled the glare.

Now, after lens replacements and retinal reattachments, I continue to face ongoing focus changes related to inflammation. With all these different challenges in my use of a computer, the most valuable "generic" setting for improving my ability to read my screen has been a variety of moderately dark backgrounds with a wide variety for me. to distinguish different parts of the screen. screen, with light gray or dark gray text (depending on the colors of the background). Dark black text and bright white text are distractors, but the most important element of a useful screen is that it is not too light or too dark and that the contrast is not extreme. The right balance in this range (which requires a dark theme) provides perceptible comfort to the eyes that everyone can feel, regardless of vision difficulties.

photo editing – is there evidence that a high saturation and contrast make a picture more appealing in social media?

I think that your manager is right and that this phenomenon is much more widespread than photos for social media or even photography in general.

Take a look at supermarkets and see the vivid colors and striking contrasts brands use to attract your Warning. If they require you to look at their product, the chances that you buy it increase dramatically. That's how it works for social media; If you encourage people to view your content, they may become more involved in your product.

The same goes for colorful application icons on your smartphone, and especially for the notification brands of those apps that catch your eye and engage you in their products.

Sources of additional reading

  • Morton J. Why color is important COLORCOM. Available at the following address: http://www.colorcom.com/research/why-color-matters. 2010.
  • Labrecque LI, Milne GR. Attractive red and competent blue: the importance of color in marketing. Journal of the Academy of Marketing Sciences. September 1, 2012; 40 (5): 711-27.
  • Asadollahi A, Givee M. The role of graphic design in the packaging and sale of products in Iran. Contemporary marketing magazine. 2011; 1 (5): 30-4.

WCAG 2.1 contrast problem for Google / Angular Material Design

I'm relatively new to accessibility compliance, but my research revealed a puzzling anomaly: buttons, links, and so on. of Angular Material are apparently compliant with WCAG, but do not seem to have the contrast of state required to pass. So I am a bit puzzled.

I'm talking specifically about the color change when (for example) a button receives the focus. From what I can say about WCAG, it should have at least a 3: 1 contrast ratio, but the Material design elements are nowhere near that.

For reference, here are some links to the design of the angular material:

Thank you in advance for help.

colors – Does the contrast / brightness of the monitor change frequently?

I have a VERY old Dell external monitor, which works well most of the time, but my eyes also get VERY old 🙂 I find that I need a lot more contrast when working on my Windows machine 10 Pro. Or is it just the brightness I need?

What happens is that sometimes it's fine, the blacks are black, the colors are normal, a lot of contrast. However, at random, it will suddenly "disappear". Blacks are now gray, colors are now faded, etc. If I refresh the page, it becomes clear again, but sooner or later, it fades again. And considering how today's kids seem to love the script of using VERY blue or light gray text on a white background (an ADA violation, besides, look at the), when the screen is emptied, these pages are almost invisible.

The windows contrast options / enhancements I've tried do not work very well in this regard. I just want to see black / dark prints on a white / light background. Some of them changed the screen to a yellow text on a black bg. Not useful 🙂

I obviously try to avoid buying a new monitor, but if it 's actually a symptom of a seriously aging or faulty monitor, I Maybe he'll have to bite the bullet, damn it.



Charlotte NC

Lens – Washed images with low contrast on 35mm

It looks like something is causing the overexposure of your movie.

It's not because the camera did not do it before that something did not go wrong, especially since it still seems to be doing it now. This also applies to your treatment laboratory.

Some points to check:

  • Does the aperture stop at the selected setting just before the shutter is opened? The link in a Konica Hexanon 40mm f / 1.4 broke once on me and I almost went crazy by testing the camera counter trying to find out what was wrong before discovering the problem posed with the lens.
  • Does the shutter work properly? Or can the second curtain be too slow? If you can find a store that still does, consider having the shutter sync tested.
  • Does the film speed selector work properly? Is the same scene measured differently if you change the movie speed setting?
  • When was the last time you tested / changed the battery of your photometer? If you leave the lens cap on a lens attached to your camera, or let the light shine in the viewfinder, the battery will discharge fairly quickly (over days or weeks).
  • Another common problem is that the connection between the battery holder and the wire leading to the measuring circuit is corroded. Cleaning and resoldering will sometimes solve a problem with the meter.
  • If you have a store in your area that does, have the meter tested.

If you have not correctly developed a roll of one of your other cameras since the two rollers of your K1000 have come back overexposed / overdeveloped, also check with the lab that they are not going to be overdelivered. have not changed anything. Someone may have accidentally mixed a lot of too much developer or used a type requiring a shorter development time, whereas he was thinking of using another requiring longer development times.

Autofocus – Are AF with Focus and Contrast Focus likely to be misled by metallic reflections?

You're wondering about some shots that have gone wrong, with manual focus and manual focus, and reflections from metal / reflective (think of scenes with wrecked car wrecks or shards of glass under the midday sun, reflections on the water.)

Will a focused debugging system easily detect virtual images in reflective objects and suggest a focus that would not be suitable for the reflective object itself? Is this a concern to take into account with the CDAF autofocus as well?

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accessibility – Is there a standard to indicate a high contrast style?

I am working on a web application and have developed a normal style sheet and a high contrast secondary style sheet. I am confused when it comes to allowing a user to change their style.

Is there a standard icon / text to use?

Until now, I have links as follows (the high contrast is visible only in normal view and the normal view is visible only in high contrast ).

switch to high contrast
switch to normal view