You have to extract the pixel buffer of the image, at which point you can loop through, changing pixels as you see fit. At the end, create a new image from the buffer. In Swift 3, this looks like: func processPixels(in image: UIImage) -> UIImage? { guard let inputCGImage = image.cgImage else { print(“unable to … Read more
You can add a new property of type IFormFile to your view model public class CreatePost { public string ImageCaption { set;get; } public string ImageDescription { set;get; } public IFormFile MyImage { set; get; } } and in your GET action method, we will create an object of this view model and send to … Read more
If you want speed, then LockBits. See here for a good walkthrough by Bob Powell. If you just want to edit a few, then GetPixel/SetPixel should do what you want.
Use createScaledBitmap will make your image looks very bad. I’ve met this problem and I’ve resolved it. Below code will fix the problem: public Bitmap BITMAP_RESIZER(Bitmap bitmap,int newWidth,int newHeight) { Bitmap scaledBitmap = Bitmap.createBitmap(newWidth, newHeight, Config.ARGB_8888); float ratioX = newWidth / (float) bitmap.getWidth(); float ratioY = newHeight / (float) bitmap.getHeight(); float middleX = newWidth / … Read more
Your best bet as always is to find a well tested library. However, you said that is difficult, so here is some dodgy largely untested code that should work for a fair number of cases: using System; using System.Collections.Generic; using System.Drawing; using System.IO; using System.Linq; namespace ImageDimensions { public static class ImageHelper { const string … Read more
I know this question is quite old, but as new software comes out it does help to get some new links to projects that might be interesting for folks. imgscalr is pure-Java image resizing (and simple ops like padding, cropping, rotating, brighten/dimming, etc.) library that is painfully simple to use – a single class consists … Read more
Here’s a nicely commented Image Manipulation helper class that you can look at and use. I wrote it as an example of how to perform certain image manipulation tasks in C#. You’ll be interested in the ResizeImage function that takes a System.Drawing.Image, the width and the height as the arguments. using System; using System.Collections.Generic; using … Read more
AFAIK, the only way to do this is with <canvas/>… DEMO V2: http://jsfiddle.net/xLF38/818/ Note, this will only work with images on the same domain and in browsers that support HTML5 canvas: function getAverageRGB(imgEl) { var blockSize = 5, // only visit every 5 pixels defaultRGB = {r:0,g:0,b:0}, // for non-supporting envs canvas = document.createElement(‘canvas’), context … Read more
Update 2014-05-28: I wrote this when iOS 3 or so was the hot new thing, I’m certain there are better ways to do this by now, possibly built-in. As many people have mentioned, this method doesn’t take rotation into account; read some additional answers and spread some upvote love around to keep the responses to … Read more