cv2 uses numpy for manipulating images, so the proper and best way to get the size of an image is using numpy.shape. Assuming you are working with BGR images, here is an example: >>> import numpy as np >>> import cv2 >>> img = cv2.imread(‘foo.jpg’) >>> height, width, channels = img.shape >>> print height, width, … Read more
Given a data URL, you can create an image (either on the page or purely in JS) by setting the src of the image to your data URL. For example: var img = new Image; img.src = strDataURI; The drawImage() method of HTML5 Canvas Context lets you copy all or a portion of an image … Read more
You can use down-stepping to achieve better results. Most browsers seem to use linear interpolation rather than bi-cubic when resizing images. (Update There has been added a quality property to the specs, imageSmoothingQuality which is currently available in Chrome only.) Unless one chooses no smoothing or nearest neighbor the browser will always interpolate the image … Read more
Here are some example images for common use, mostly from existing answers on SO. Icons Simple Geometric shapes generated using Java as originally seen in this answer. It includes a Java based interface that defines the URLs and makes them easy to access. Details: 32×32 pixel PNG (4 colors x 5 shapes) with partial transparency … Read more
Preloading images using CSS only In the below code I am randomly choosing the body element, since it is one of the only elements guaranteed to exist on the page. For the “trick” to work, we shall use the content property which comfortably allows setting multiple URLs to be loaded, but as shown, the ::after … Read more
Updating to 2012, when we see that image sizes, and number of images, are growing and growing, in all applications… We need some distinction between “original image” and “processed image”, like thumbnail. As Jcoby’s answer says, there are two options, then, I recommend: use blob (Binary Large OBject): for original image store, at your table. … 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
I have just found the builtin imghdr module. From python documentation: The imghdr module determines the type of image contained in a file or byte stream. This is how it works: >>> import imghdr >>> imghdr.what(‘/tmp/bass’) ‘gif’ Using a module is much better than reimplementing similar functionality UPDATE: imghdr is deprecated as of python 3.11
And now the punchline: use the system cache. URL url = new URL(strUrl); URLConnection connection = url.openConnection(); connection.setUseCaches(true); Object response = connection.getContent(); if (response instanceof Bitmap) { Bitmap bitmap = (Bitmap)response; } Provides both memory and flash-rom cache, shared with the browser. grr. I wish somebody had told ME that before i wrote my own … Read more
just this as img tag is a content element img { content:url(http://example.com/image.png); }