WebP — Google Web Image Format
Open BetaWebP is Google's open raster format built on the VP8 video codec (lossy) and its VP8L extension (lossless). On osm2cdr.ru the map is rendered to PNG and then transcoded to WebP via Pillow. In lossy mode the file is 25–35% lighter than JPEG; in lossless mode 26% lighter than PNG. WebP supports transparency and works in every mainstream browser. It is a finished map image, not editable layers — a handy lightweight format for previews and thumbnails, but not a replacement for GeoTIFF in full-size cartographic export.
主要特点
关于 WebP 格式
WebP is Google's raster format, grown out of the VP8 video codec. It works in two modes: lossy, when weight matters, and lossless, when pixel accuracy matters. Transparency is supported by both modes, and WebP is displayed by every current browser.
For maps this is a screen format: a preview in a catalog, a picture in an article, an asset in a mobile app. Where PNG weighs more than it should and JPEG blurs thin road lines and labels, WebP gives a reasonable compromise between weight and readability.
The map is rendered to PNG and then re-encoded into WebP: lossy mode and quality 80 by default, or lossless mode with exact pixel reproduction if you prefer. This is a finished image: layers are not editable and there are no coordinates inside. For a print house take TIFF or PDF, for a GIS — GeoTIFF.
打开 WebP 文件的程序
以下程序可以打开、编辑和处理从 OSM2CDR 导出的 WebP — Google Web Image Format（.webp）文件：
格式规格
- 开放标准
- 仅 2D
- 有损压缩
- 无属性
- 输出：1 个文件
- A single WebP transcoded from PNG via Pillow; lossy VP8 by default (~25-35% lighter than JPEG) with an optional lossless VP8L mode, alpha supported.
谁在使用 WebP 地图
如何导出 WebP
导出后如何打开
- A browser — just open the file: Chrome, Firefox, Edge and Safari 14 and newer display WebP without plugins.
- A web page — <picture><source srcset="map.webp" type="image/webp"><img src="map.png" alt="map"></picture>: older clients will get the fallback PNG.
- GIMP, Affinity Photo, Photoshop 2022 and newer — they open and save WebP; handy for cropping the picture or adding a caption.
- ImageMagick or cwebp — re-encode to your own requirements: magick map.webp -quality 70 out.webp, or cwebp -lossless for exact pixel reproduction.
- Not for print — this is an RGB picture for the screen; for a print house take TIFF, CMYK TIFF or PDF.
WebP 格式的热门地图
导出 WebP — Google Web Image Format 地图
从 OpenStreetMap 下载专业的 WebP 地图。即时生成，任意区域。