contrast

I'm looking for a way to change the color of text to either #000 or #fff depending on the main color of a background image within a div called "banner". The background images are chosen at random on each page so I need to be able to do this automatically. I came across JavaScript color contraster but I'm struggling to understand how to use it properly. I notice the link I've posted gives a solution in javascript and I've also read about a possible solution in jquery. I'm clueless with functions so if anyone could explain clearly how I could achieve this, where I place functions and how I "call

I have a background of a field. The bottom is green, the top is gray. There is text on top of the background. Is there a way for the text to "sense" what color the background is and to tint the font in a way to make it contrast? For example, the the text over the gray sky would become brighter and the text over the green field would become darker, to make it more visible. I may be reaching pretty far on this one, but any suggestions are appreciated. (Please note, I am not looking for the answer to manually change the font colors.) vals More as an experiment than otherwise: Set the text with a

Hi I want to implement contrast filter in my application like this link or this contrast but with color matrix and track bar for value I already found color matrix for it float c = mytrackbar.value * 0.01f //maxTrackbarValue = 100, minTrackbarValue = -100 float t = 0.01f; cmPicture = new ColorMatrix(new float[][] { new float[] {c,0,0,0,0}, new float[] {0,c,0,0,0}, new float[] {0,0,c,0,0}, new float[] {0,0,0,1,0}, new float[] {t,t,t,0,1} }); but the result is very different. I try to change 0.01f in ~c~ and 0.01f in ~t~ value but it only gives result like brightness (ex : c = mytrackbar.value *

This question already has answers here : Closed 5 years ago . How to Decrease Image Brightness in CSS (11 answers) Recently I've updated Chrome to v.26 and pictures which were displayed using HTML5 canvas were not visible anymore. As I found I had to change to brightness and contrast. How are the values for BC for CSS filters different depending on the browser engine? Default: Brightness: 0; contrast 100: Firefox ? Brightness:100; contrast:100: Chrome ? As I found out it is actually a bug fix for Chrome: https://code.google.com/p/chromium/issues/detail?id=168004 I found this and it will

I am working on a face recognition project. I have pictures with different lighting so I need to do illumination normalization. I read a paper which which claims to do illumination normalization. The paper describe the following function and values. 1- gamma correction with gamma = 0.2 2- Difference of Gaussian (DOG) filtering with (sigma0 = 1, sigma1 =2) 3- contrast equalization (truncation threshold of 10 and compressive component 0.1 is used in the paper) I use CvPow for gamma correction, CvSmooth for DoG and Threshold() with truncate (I don't know how to specify the compression component)

I'm looking for a technique where we could programmatically pick the best color contrast to apply on text over HTML elements of different (unpredictable) background colors. Since the HTML elements will have different colors, we're looking for a technique that will be able to determine what is the color of the content behind the text, and then adapt the text's color to use the one with the best contrast. I'm quite sure this can't be CSS only, I've looked for Jquery solutions but couldn't find any... anyone has a clue? [UPDATE] : Based on the first replies, I guess I need to rephrase. Imagine

I have a tool with trackbar slider controls used to adjust an image's brightness, contrast, gamma, etc. I am trying to get real-time updates to my image while the user drags the slider. The brightness and gamma algorithms are an acceptable speed (around 170ms). But the contrast algorithm is about 380ms. Basically my form is a tool window with sliders. Each time the image is updated, it sends an event to the parent which redraws the new image. The tool window keeps the original unmodified image locked in memory so I always have access to the bytes of it. So basically I do this each time the