On-the-fly resizing and conversion - optimized images can be generated on demand by proxying them through ImageOptim's CDN.On the other hand, if you don't have an image processing back-end, you don't need to build one. If your website already has a back-end for processing images, you can keep it, and enhance it with ImageOptim's API. Multiple quality presets tuned for mobile networks, high- DPI displays, and pro photography.Easy URL syntax for HTML5 srcset for high- DPI displays.Automatic cropping based on saliency detection.Anti-aliasing filters are optimized for JPEG compression to improve file sizes. Processing is done in linear-light 48-bit color to ensure highest quality.ImageOptim API has a high-quality implementation of the usual resizing and cropping options: Resizing for thumbnails and responsive images Uses the latest version of libimagequant to reduce file sizes of true-color PNG files by 75%. Non-standard and filesize-heavy embedded color profiles are converted to most efficient, minimal alternative profiles.Correctly supports reading images in CMYK, Adobe 1998 and other color profiles.Some of these features were developed specifically for the ImageOptim API and are not available anywhere else. Color fringing reduction - patterns on colorful backgrounds appear sharper.Gamma-correct chroma subsampling - highly-saturated lines and edges are sharper and higher quality.Quantization tables optimized for high- DPI screens - avoids bloating files with details that are invisible to the naked eye.Overshoot deringing - makes text and lines on white background appear sharper.Progressive rendering - only 15% of image data is needed to start displaying it on screen.Trellis quantization, optimized Huffman tables, scan split optimization - advanced techniques for maximum file size reduction.ImageOptim API uses a custom JPEG encoder with features to improve compression as well as increase quality of compressed photos: « Features overview ImageOptim API features in detail Advanced JPEG compression
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