If you have limited depth of directories and not too many files, then lazy solution: pngquant *.png */*.png */*/*.png A standard solution: find . -name ‘*.png’ -exec pngquant –ext .png –force 256 {} \; and multi-core version: find . -name ‘*.png’ -print0 | xargs -0 -P8 -L1 pngquant –ext .png –force 256 where -P8 defines … Read more
The ImageMagik command: identify -format ‘%[channels]’ foo.png will print rgba or rgb if there is or is not an alpha channel, respectively. There could be an alpha channel present with no data in it which wouldn’t actually have any transparency, but that is a bit more complicated.
Hey, I don’t know if you’re still looking for an answer. A couple of days ago I had the same issue animating a div with a PNG image inside. I tried many solutions and the only one that worked fine is one I coded myself. The issue seems to be IE lacking opacity support and … Read more
Don’t forget to add an event listener to the image’s load event. Image loading is something that happens in the background, so when the JavaScript interpreter gets to the canvas.drawImage part it is most likely the image probably will not have loaded yet and is just an empty image object, without content. drawing = new … Read more
Create a large image which you will write to. Work out its dimensions based on how many rows and columns you want. BufferedImage result = new BufferedImage( width, height, //work these out BufferedImage.TYPE_INT_RGB); Graphics g = result.getGraphics(); Now loop through your images and draw them: for(String image : images){ BufferedImage bi = ImageIO.read(new File(image)); g.drawImage(bi, … Read more
You can do it with a help of a simple bash script. Navigate to the directory where your images reside and execute this: $ for file in * > do > cwebp -q 80 “$file” -o “${file%.png}.webp” > done You can change the output file name, as you want. But should end with a .webp … Read more
section 11.3.4.2 of the PNG spec gives a list of pre-defined meta tags (keywords) http://www.w3.org/TR/PNG/#11textinfo you can add as many other meta tags/fields as you would like. as for how, programmatically, that depends on the language you’re using!
Ok, so you can convert PNG to Android vector drawable following these steps Step 1: Convert PNG to SVG (Scalable Vector Graphics) https://www.autotracer.org/ Or you can use any online converter of your choice Step 2: Use the generated SVG in step 1 and convert it to Android vector drawable using this link http://inloop.github.io/svg2android/ http://a-student.github.io/SvgToVectorDrawableConverter.Web/ Alternatively … Read more
This is the way I do it and it seems to work. convert -background none -density 1000 -resize 1000x compass.svg compass.png Here’s what each part does. Use -background none to make sure any transparent parts of the SVG stay transparent and not get filled with white. As ImageMagick only works with raster images you need … Read more
Example text file (named myres.rc): MYPNG RCDATA mypng.png Added to project: {$R ‘myres.res’ ‘myres.rc’} Example of loading at runtime: uses PngImage; var Png: TPngImage; begin Png := TPngImage.Create; try Png.LoadFromResourceName(HInstance, ‘MYPNG’); Image1.Picture.Graphic := Png; // Image1: TImage on the form finally Png.Free; end; end;