Recently I've been playing with Android's Bitmap processing using NDK (C++) and RenderScript. I used these technologies to create an Image Histogram. I later decided to create a similar tool for web using WebAssembly
www.sisik.eu/histo

The online tool has the following features

• can extract pixel values from various image file formats
• draws histogram using JavaScript canvas (there are some options that can influence how histogram is displayed)
• allows to export histogram values into a CSV file, so that the values can be processed in a spreadsheet application

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