About the processing pipeline
imgproxy has a specific processing pipeline tuned for maximum performance. When you process an image with imgproxy, it does the following:
- If the source image format allows shrink-on-load, imgproxy uses it to quickly resize the image to the size that is closest to desired.
- If it is needed to resize an image with an alpha-channel, imgproxy premultiplies one to handle alpha correctly.
- imgproxy resizes the image to the desired size.
- If the image colorspace need to be fixed, imgproxy fixes it.
- imgproxy rotates/flip the image according to EXIF metadata.
- imgproxy crops the image using the specified gravity.
- imgproxy fills the image background if the background color was specified.
- imgproxy applies filters.
- imgproxy adds a watermark if one was specified.
- And finally, imgproxy saves the image to the desired format.
This pipeline, using sequential access to source image data, allows for significantly reduced memory and CPU usage — one of the reasons imgproxy is so performant.