You can further reduce quality of PNG by using posterization: https://github.com/pornel/mediancut-posterizer (Mac GUI) This is a lossy operation that allows zlib to compress better. Convert image to PNG8 using pngquant. It reduces images to 256 colors, so quality depends on the type of image, but pngquant makes very good palettes, so you might be surprised … Read more
Kurt’s answer showed the way, still it took me quite some time to get it run, so here is the code that sets DPI when saving a PNG. There is a lot to do to get the proper writers and such… private BufferedImage gridImage; … private void saveGridImage(File output) throws IOException { output.delete(); final String … Read more
You can use the Windows Imaging Component to load PNG files (on Windows XP SP2 and later). See MSDN Magazine (original in web archive – a bit better formatting) for an introduction on how to use the API and my blog post for a code sample that loads a PNG from an IStream and converts … Read more
Andrés’ answer is somewhat correct, but it does not address the exact cause of the problem, and that is iOS’ App Transport Security. iOS does not allow plaintext requests (http) by default, and so you need to define a ‘whitelist’ of URLs that can be allowed to override this particular protection mechanism. You have that … Read more
Quick answer Setting the src attribute of the img tag to an empty string will interrupt the current download, even on Chrome. ###Details Nowadays most of browsers implemented that out-of-standard mechanism thought in the old answer to programmatically abort the connection. This is not achieved through a protocol request, but with a client-side in-memory operation. … Read more
I’ve been wondering this too, and I was pleasantly surprised to find that, according to the SVG spec, there is a specific function to return this info: getComputedTextLength() // access the text element you want to measure var el = document.getElementsByTagName(‘text’)[3]; el.getComputedTextLength(); // returns a pixel integer Working fiddle (only tested in Chrome): http://jsfiddle.net/jyams/
If you are using react-native-image-picker for uploading images, you can set maxWidth, maxHeight or quality of image for reducing the size. const options = { title: ‘Select Picture’, storageOptions: { skipBackup: true, path: ‘images’, }, maxWidth: 500, maxHeight: 500, quality: 0.5, }; ImagePicker.showImagePicker(options, resolve, reject);
Note that this answer is outdated as of 2018; scipy has deprecated imread, and you should switch to imageio.imread. See this transition doc about differences between the two. The code below should work with no changes if you just import the new library in place of the old, but I haven’t tested it. The simplest … Read more