contrast

I want to programmatically change the contrast of bitmap. Till now I have tried this. private Bitmap adjustedContrast(Bitmap src, double value) { // image size int width = src.getWidth(); int height = src.getHeight(); // create output bitmap Bitmap bmOut = Bitmap.createBitmap(width, height, src.getConfig()); // color information int A, R, G, B; int pixel; // get contrast value double contrast = Math.pow((100 + value) / 100, 2); // scan through all pixels for(int x = 0; x < width; ++x) { for(int y = 0; y < height; ++y) { // get pixel color pixel = src.getPixel(x, y); A = Color.alpha(pixel); //

Under what cases do you create contrasts in your analysis? How is it done and what is it used for? I checked ?contrasts and ?C - both lead to "Chapter 2 of Statistical Models in S", which is not readily available to me. Contrasts are needed when you fit linear models with factors (i.e. categorical variables) as explanatory variables. The contrast specifies how the levels of the factors will be coded into a family of numeric dummy variables for fitting the model. Here are some good notes for the different varieties of contrasts used: http://www.unc.edu/courses/2006spring/ecol/145/001/docs

Is there an efficient way of adjusting the contrast of an image in C#? I've seen this article which advocates doing a per-pixel operation. Not quick. I'm using colour matrices in places already and find them to be quick. Is there a way to adjust contrast using them? (Note: This guy gets it wrong.) I'm also using EmguCV. I notice that OpenCV (which Emgu wraps) seems to have a contrast function - is there any way of accessing this through Emgu? At the moment all I can do in Emgu is normalise the histogram, which does change the contrast, but not with any degree of control on my part. Anyone got

I want to show some images like this example The fill color is decided by a field in the data base with the color in hex (ex:ClassX -> Color: #66FFFF). Now, I want to show data above a fill with the selected color (like in the image above) but i need to know if the color is dark or light so i know if the words should be in white or black. Is there a way? tks Building on my answer to a similar question . You need to break the hex code into 3 pieces to get the individual red, green, and blue intensities. Each 2 digits of the code represent a value in hexadecimal (base-16) notation. I won't get