In this blog post, a free online webapp is recommended to extract rgba value of image pixels, and save as a csv file.
Tool
Image Pixel Rgba
Access
https://s.wtsolutions.cn/image-pixel-rgba.html
Usage
- Opening the link above
- Drag and drop your images to the webapp
- Wait until a pop up showing completion
- Check for the exported .csv file
Advantages
- Free Webapp
- Privacy matters, the images will stay locally on your device, will not be transmitted to any server.
- Very simple UI, simple to use.