Here’s a breakdown of the image URLs provided, explaining what each part does:
Base URL & Core Components
* https://npr.brightspotcdn.com/dims3/default/: This is the base URL for NPR’s image delivery system (Brightspot). dims3 likely refers to a specific version or configuration of their image processing service.
* strip/false/: Indicates that no stripping of metadata (like EXIF data) is performed on the image.
* crop/5562x3708+0+0/: This defines a rectangular crop of the original image.
* 5562x3708: The width and height of the cropped area in pixels.
* +0+0: The coordinates (x, y) of the top-left corner of the crop relative to the original image. +0+0 means the crop starts at the very top-left of the original.
* resize/{width}/quality/{quality}/format/{format}/: This is the core of the dynamic image resizing and optimization.
* {width}: A placeholder that is replaced with the desired width of the image in pixels (e.g., 400, 600, 1200).
* {quality}: A placeholder for the JPEG quality setting (e.g., 85, 50). Higher numbers mean better quality but larger file size.
* {format}: Specifies the image format (e.g., jpeg).
* ?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Fa4%2Fb4%2Fc504616c478997001dfdee23eea4%2Fap25358808746990.jpg: This is a query parameter that tells the dims3 service where to find the original image. the URL is URL-encoded (e.g., %3A represents a colon :) and points to an image stored in an Amazon S3 bucket (npr-brightspot.s3.amazonaws.com).
Specific URLs Explained
The provided list shows diffrent versions of the same image, optimized for different display sizes and quality levels:
* https://npr.brightspotcdn.com/dims3/default/strip/false/crop/5562x3708+0+0/resize/400/quality/85/format/jpeg/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Fa4%2Fb4%2Fc504616c478997001dfdee23eea4%2Fap25358808746990.jpg: A 400-pixel wide image with 85% JPEG quality.
* **`https://npr.brightspotcdn.com/dims3/default/strip/false/crop/5562×3708+0+0/resize/600/quality/85/format/jpeg/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Fa4%2Fb4%2Fc504616c478997001dfdee23eea4%2Fap253588
