masking

I'm new to Quartz. I have 2 images, a background, and a mask with cutout shape that I want to lay over the background in order to cut out a section. The resulting image should be the shape of the cutout. This is my mask (the shape in the middle is 0 alpha): And this is my code: UIView *canvas = [[[sender superview] subviews] objectAtIndex:0]; UIGraphicsBeginImageContext(canvas.bounds.size); CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef cgContext = CGBitmapContextCreate(NULL, canvas.bounds.size.width, canvas.bounds.size.height, 8, 0, colourSpace,

I saw some apps where even though a black icon was included, some how the app used CSS to convert the icon into a different colour. I can't seem to repeat this process Here's my back.css file: .dashboard-buttons a { width: 80px; height: 80px; border: 1px solid #ccc; margin: 0px 5px; display:inline-block; border-radius: 10px; background:white; text-decoration:none; -moz-box-shadow: inset 0 0 15px rgba(0,0,0, 0.25); -webkit-box-shadow: inset 0 0 15px rgba(0,0,0, 0.25); } .dashboard-buttons a:hover { text-decoration:underline; } .dashboard-buttons span, .dashboard-buttons img { display:inline;

Here is how to create a clipping area the shape of a circle: Path path = new Path(); path.addCircle(200,200,100,Direction.CW); c.clipPath(path); // c is a Canvas Now there's a clipping area on the Canvas which prevents drawing anything outside the bounds of that circle. But, what if I want to have the clipping area be shaped like a donut (or whatever)? I tried playing around with creating a second Path and using toggleInverseFillType on it and then adding that to the original path, but that doesn't seem to work. Alternatively, instead of using a Path, is it possible to just create a Bitmap to

I am trying to tan human skin with different intensity with help of opencv. I have already identified human skin and changing color tone of those pixels. But it is not smooth. Top left - original image Top right - saturation channel of original image Bottom left - Gray scale mask identifying locations of skin on original image Bottom right - result image with color tone changed of pixels located in mask. Now my problem is that, in mask image some gap is left because of variation on color tone or brightness in original image. And that is why those portion is missed in result image. Can anyone

I am using meioMask – a jQuery mask plugin to put time mask in a textbox. Here is the JsFiddle . It's working well. But I also need to put hh:mm in the textbox, to let the user know what to enter in the textbox. How to do this. EDIT: I also need to put am/pm in the mask. and I need 12 hrs time format. It looks like you should be able to set this with the plugin. Here's a start maybe? If you look in the code, I think you should be passing setMask an options object. It looks like defaultValue is a possible option. It looks like the following should work (but it doesn't): $("#txtTime").setMask(

OK, After a bit of fiddling, I've tweaked a script from the site hyperlink in the second comment line. The purpose of the script is to clip/mask a LARGE raster (i.e. that cannot fit into a 32-bit Python 2.7.5 application) in GTiff format with a shapefile with multiple polygons (each with a "Name" record) and save the clipped rasters into a "clip" sub-directory, where each masked grid is named after each polygon's "Name". Like the original script, it assumes that the GTiff and shapefile are in the same projection and overlap correctly, and it processes ~100 masks/sec. However, I have modified