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What is the smallest valid jpeg file size (in bytes)
A 1×1 grey pixel in 125 bytes using arithmetic coding, still in the JPEG standard even if most decoders can’t decode it: ff d8 : SOI ff e0 ; APP0 00 10 4a 46 49 46 00 01 01 01 00 48 00 48 00 00 ff db ; DQT 00 43 00 03 02 …
Detecting multiple images in a single image
The “multiple image” you showed is easy enough to handle using just simple image processing, no need for template matching 🙂 % read the second image img2 = imread(‘https://i.stack.imgur.com/zyHuj.jpg’); img2 = im2double(rgb2gray(img2)); % detect coca-cola logos bw = im2bw(img2); % Otsu’s thresholding bw = imfill(~bw, ‘holes’); % fill holes stats = regionprops(bw, {‘Centroid’, ‘BoundingBox’}); % …
Change brightness of background-image?
You can have more layers in the “background” like this: .someObj{ background: linear-gradient(rgba(255,255,255,0.5), rgba(255,255,255,0.5)), url(myBgImage.png); } This will put 50% white over the original image making it brighter. Linear-gradient function has to be used, otherwise it doesn’t work. Alternatively use: .someObj:after{ content:”; background:rgba(255,255,255,.5); … } and this is better for code maintainability.
Using raw image data from ajax request for data URI
Thanks for that. I’ve done a bit more digging on this and it turns out there is a solution at least on current versions of Firefox and Chrome (EDIT: IE10 works too). You can use XMLHttpRequest2 and use a typed array (Uint8Array). The following code works: <!DOCTYPE html> <html> <head> <script type=”text/javascript”> function init() { …
Robust and fast checksum algorithm?
If you have many small files, your bottleneck is going to be file I/O and probably not a checksum algorithm. A list of hash functions (which can be thought of as a checksum) can be found here. Is there any reason you can’t use the filesystem’s date modified to determine if a file has changed? …
How do I resize an image while keeping the aspect ratio in CSS?
Just set the width to auto: img { width: auto; max-height: 100%; } Here’s the fiddle: http://jsfiddle.net/6Y5Zp/
How to display user profile image in circle?
background-size MDN – CSS Tricks – Can I Use As the image sizes are variable, you want to make sure they cover the div as well as being centered within it. Adding the border-radius: 50%; will give you the circle effect. .user { display: inline-block; width: 150px; height: 150px; border-radius: 50%; background-repeat: no-repeat; background-position: center …
How to crop SVG file within HTML/CSS
Crop You can crop the image by using negative margins and fixing the size of the parent element: CSS Display an Image Resized and Cropped BUT THIS IS AN SVG! Not only can you display an svg directly in html: <svg viewBox=”0 0 100 100″ height=”150px” width=”150px”> <rect x=”10″ y=”10″ rx=”5″ width=”80″ height=”80″ fill=”pink” stroke=”green” …