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The Colour Contrast Check Tool allows to specify a foreground and a background colour and determine if they provide enough of a contrast "when viewed by someone having color deficits or when viewed on a black and white screen"[W3C].

Why is the colormatch wheel anything but round? The traditional colorwheel has red in the noon position and proceeds counter-clockwise in twelve hue steps. But in color scheming "some colors are more equal than others". The Unsafe Colormatch wheel attempts to reflect this by overlapping the interesting colors and by putting more contrasting colors on top of less contrasting. The big central block is the base color as specified by the user. First hue step relative to the basecolor is in the 11 o'clock position. Next step is at 10 and so on. The blocks for primary and secondary colors (60 degrees apart) are bigger than the tertiary color blocks. Colors best suited for combining into a color scheme overlap with the basecolor. White and black are included so you can see them together with your colors. This way of arranging the colors may help you judge a color scheme at a glance.

This site is dedicated to the use of colors in design, and especially in web design. I'm hoping that this site will give web designers a better understanding of the importance of colors-- that there might be more to colors than you once thought. Some of the topics I discuss on this site are: color theory the color wheel color combinations color physics colors on the web

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The Flicker Test checks images in a web page for flickering, rate of flickering and colour contrast. This particularly affects people with Photosensitive Epilepsy. A URI can be entered in an input field and a report is generated with detailed reports on each image.

ere you can resize images maintaining quality, edges and texture. This means Reshade reduces or eliminates most of the usual side-effects of photo enlargement: 1. pixelation: visible square pixels in an image 2. loss of focus: blurry / out of focus image edges 3. loss of sharpness: reduced edge contrast 4. exagerated noise: random pixel values, stains

Automatically enhances the contrast and tone of your images. Works with uploaded or hosted images.

It simulates three kinds of vision deficiencies: deuteranopia,protanopia and tritanopia.

Edit photos non-destructively and download the modified version once you are done. Supports the usual tools such as resize, crop, rotate, flip, brightness/contrast, saturation and various special effects etc.