My own favorites are these two: compare image1 image2 -compose src diff.png compare image1 image2 -compose src diff.pdf The only difference between the 2 commands above: the first one shows the visual difference between the two images as a PNG file, the second one as a PDF. The resulting diff file displays all pixels which … Read more
Yes, of course this is possible. When dragging multiple files on a batch file you get the list of dropped files as a space-separated list. You can verify this with the simple following batch: @echo %* @pause Now you have two options: PngCrush can already handle multiple file names given to it on the command … Read more
Here’s some C99 source implementing the traditional approach (based on OpenCV doco): #include “cv.h” #include “highgui.h” #include <stdio.h> #ifndef M_PI #define M_PI 3.14159265358979323846 #endif // // We need this to be high enough to get rid of things that are too small too // have a definite shape. Otherwise, they will end up as ellipse … Read more
You could just use some HTML in your Markdown: <img src=”https://stackoverflow.com/questions/14675913/drawing.jpg” alt=”drawing” width=”200″/> Or via style attribute (not supported by GitHub) <img src=”https://stackoverflow.com/questions/14675913/drawing.jpg” alt=”drawing” style=”width:200px;”/> Or you could use a custom CSS file as described in this answer on Markdown and image alignment  CSS in another file: img[alt=drawing] { width: 200px; }
Here is a demo. The correct animation CSS: .image { position: absolute; top: 50%; left: 50%; width: 120px; height: 120px; margin:-60px 0 0 -60px; -webkit-animation:spin 4s linear infinite; -moz-animation:spin 4s linear infinite; animation:spin 4s linear infinite; } @-moz-keyframes spin { 100% { -moz-transform: rotate(360deg); } } @-webkit-keyframes spin { 100% { -webkit-transform: rotate(360deg); } } … Read more
Yes, you can reference any image from the image element. And you can use data URIs to make the SVG self-contained. An example: <svg xmlns=”http://www.w3.org/2000/svg” xmlns:xlink=”http://www.w3.org/1999/xlink”> … <image width=”100″ height=”100″ xlink:href=”data:image/png;base64,IMAGE_DATA” /> … </svg> The svg element attribute xmlns:xlink declares xlink as a namespace prefix and says where the definition is. That then allows the … Read more
I think you are converting the data a bit more than you need to. Once you create the buffer with the proper encoding, you just need to write the buffer to the file. var base64Data = req.rawBody.replace(/^data:image\/png;base64,/, “”); require(“fs”).writeFile(“out.png”, base64Data, ‘base64′, function(err) { console.log(err); }); new Buffer(…, ‘base64’) will convert the input string to a … Read more
Update 2016: Modern browser behave much better. All you should need to do is to set the image width to 100% (demo) .container img { width: 100%; } Since you don’t know the aspect ratio, you’ll have to use some scripting. Here is how I would do it with jQuery (demo): CSS .container { width: … Read more
This is a huge topic, with answers from 3 lines of code to entire research magazines. I will outline the most common such techniques and their results. Comparing histograms One of the simplest & fastest methods. Proposed decades ago as a means to find picture simmilarities. The idea is that a forest will have a … Read more
How to generate or reverse a Dockerfile from an image? You can. Mostly. Notes: It does not generate a Dockerfile that you can use directly with docker build; the output is just for your reference. alias dfimage=”docker run -v /var/run/docker.sock:/var/run/docker.sock –rm alpine/dfimage” dfimage -sV=1.36 nginx:latest It will pull the target docker image automatically and export … Read more