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59 lines
2.4 KiB
Markdown
59 lines
2.4 KiB
Markdown
# Watermark
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imgproxy supports watermarking processed images with another image.
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## Specifying watermark image
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There are three ways to specify a watermark image using environment variables:
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* `IMGPROXY_WATERMARK_PATH`: path to the locally stored image.
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* `IMGPROXY_WATERMARK_URL`: watermark image URL.
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* `IMGPROXY_WATERMARK_DATA`: Base64-encoded image data. You can easily calculate it with the following snippet:
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```bash
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base64 tmp/watermark.webp | tr -d '\n'`.
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```
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You can also specify the base opacity of watermark with `IMGPROXY_WATERMARK_OPACITY`.
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**📝Note:** If you're going to use `scale` argument of `watermark`, it's highly recommended to use SVG, WebP or JPEG watermarks since these formats support scale-on-load.
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## Watermarking an image
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Watermarks are only available with [advanced URL format](generating_the_url_advanced.md). Use `watermark` processing option to put the watermark on the processed image:
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```
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watermark:%opacity:%position:%x_offset:%y_offset:%scale
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wm:%opacity:%position:%x_offset:%y_offset:%scale
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```
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Where arguments are:
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* `opacity` - watermark opacity modifier. Final opacity is calculated like `base_opacity * opacity`.
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* `position` - (optional) specifies the position of the watermark. Available values:
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* `ce`: (default) center;
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* `no`: north (top edge);
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* `so`: south (bottom edge);
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* `ea`: east (right edge);
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* `we`: west (left edge);
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* `noea`: north-east (top-right corner);
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* `nowe`: north-west (top-left corner);
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* `soea`: south-east (bottom-right corner);
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* `sowe`: south-west (bottom-left corner);
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* `re`: replicate watermark to fill the whole image;
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* `x_offset`, `y_offset` - (optional) specify watermark offset by X and Y axes. Not applicable to `re` position;
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* `scale` - (optional) floating point number that defines watermark size relative to the resulting image size. When set to `0` or omitted, watermark size won't be changed.
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## Custom watermarks<img class='pro-badge' src='assets/pro.svg' alt='pro' />
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You can use a custom watermark specifying its URL with `watermark_url` processing option:
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```
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watermark_url:%url
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wmu:%url
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```
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Where `url` is Base64-encoded URL of the custom watermark.
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By default imgproxy caches 256 custom watermarks with adaptive replacement cache (ARC). You can change the cache size with `IMGPROXY_WATERMARKS_CACHE_SIZE` environment variable. When `IMGPROXY_WATERMARKS_CACHE_SIZE` is set to `0`, the cache is disabled.
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