Lanczos Upscaling for E-commerce Images: Quality and Latency Checks

The article argues that Lanczos upscaling should sit behind a small TypeScript interface so the answer pipeline can swap implementations and test deterministically. It recommends judging the result on both visual quality and end-to-end latency, using a small fixed set of representative product images. Enlarging an image only interpolates pixels and cannot recover real detail, so an enlarged preview must not be treated as evidence for claims the source image doesn't support. The suggested rule is to use the enlarged image only when it passes visual review and fits the latency budget, otherwise returning the original or omitting the preview. The author also notes that a non-empty output is not a quality measure, since artifacts like halos and ringing require direct visual comparison against the original.