image-manipulation

Have a look on following application http://itunes.apple.com/us/app/fatbooth/id372268904?mt=8 i think they are using the same feature provided my PhotoBooth MAC. Please suggest any api or any other possible solution so that I can build an iphone application Thanks Core Image (certainly used by Photo Booth on the Mac) is not a public API on the iPhone. To achieve something similar, you would have to use OpenGL and write your own shaders (or do something like OpenGL mesh distortion). 来源： https://stackoverflow.com/questions/3829395/need-photobooth-mac-feature-in-iphone-app

I use this function to resize images but i end up with ugly creepy image with a black background if it's a transparent GIF or PNG with alpha, however it works perfectly for jpg and normal png. function cropImage($nw, $nh, $source, $stype, $dest) { $size = getimagesize($source); $w = $size[0]; $h = $size[1]; switch($stype) { case 'gif': $simg = imagecreatefromgif($source); break; case 'jpg': $simg = imagecreatefromjpeg($source); break; case 'png': $simg = imagecreatefrompng($source); break; } $dimg = imagecreatetruecolor($nw, $nh); switch ($stype) { case "png": imagealphablending( $dimg, false

In order to better understand how image manipulation works, I've decided to create my own image rotation algorithm rather than using cv2.rotate() However, I'm encountering a weird picture cropping and pixel misplacement issue. I think it may have something to do with my padding, but there may be other errors import cv2 import math import numpy as np # Load & Show original image img = cv2.imread('Lena.png', 0) cv2.imshow('Original', img) # Variable declarations h = img.shape[0] # Also known as rows w = img.shape[1] # Also known as columns cX = h / 2 #Image Center X cY = w / 2 #Image Center Y

For an image hosting web application: For my stored images, is it feasible to create thumbnails on the fly using PHP (or whatever), or should I save 1 or more different sized thumbnails to disk and just load those? Any help is appreciated. Save thumbnails to disk. Image processing takes a lot of resources and, depending on the size of the image, might exceed the default allowed memory limit for php. It is less of a concern if you have your own server with only your application running but it still takes a lot of cpu power and memory to resize images. If you're considering creating thumbnails

I have some image data in canvas, and now I need to take the left half of the image, flip it and apply it to the right, like a mirror effect. Example , from this: To this: I got this far (I have the image data ready): ctx.drawImage(this, 0, 0, 960, 540); var imgData = ctx.getImageData(0,0,960,540); // loop through the data and apply mirror ?? Width & height is known. Any ideas? Loop through the image data If the current pixel is in the left half of the image, copy it to a position on the right: for(var y = 0; y < height; y++) { for(var x = 0; x < width / 2; x++) { // divide by 2 to only loop

I have a method which needs to be as fast as it possibly can, it uses unsafe memory pointers and its my first foray into this type of coding so I know it can probably be faster. /// <summary> /// Copies bitmapdata from one bitmap to another at a specified point on the output bitmapdata /// </summary> /// <param name="sourcebtmpdata">The sourcebitmap must be smaller that the destbitmap</param> /// <param name="destbtmpdata"></param> /// <param name="point">The point on the destination bitmap to draw at</param> private static unsafe void CopyBitmapToDest(BitmapData sourcebtmpdata, BitmapData

I have a large image, size around 30000 (w) x 6000 (h) pixels. You may consider it's like a big map. I assume I need to crop it up into smaller tiles. Questions: what are the right ViewControllers to use? ( link ) what is the tile strategy? (I put this in another question, as it's not iPhone specific) Requirements: whole image (though cropped) can be scrolled up/down/left/right by swipes zoom in (up to pixel-to-pixel) out (down to screen-fit-by-height) by the 2-finger operation memory efficiency by lazy loading tiles Bonus requirements: automatic scroll, say from left to right slowly and