SQIP - SVG-Based Image Placeholder
"SQIP" (pronounced \skwɪb\ like the non-magical folk of magical descent) is a SVG-based LQIP technique.
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- Node.js >= v6 (https://nodejs.org/en/)
Non-64bit operating systems need:
- Golang (https://golang.org/doc/install)
- Primitive (https://github.com/fogleman/primitive) (
go get -u github.com/fogleman/primitive)
After installing Primitive, you may also need to add the path to the
Primitive binary file.
It would generally look something like
To do this on a Mac, type:
sudo vim /etc/paths into your terminal, and add the path to your
Primitive binary file, but be sure to add the full path,
/Users/<username>/go/bin and not
Using the command line (https://www.windows-commandline.com/set-path-command-line)
Using a GUI (https://www.computerhope.com/issues/ch000549.htm)
npm install -g sqip
Image placeholders are a thing: from grey boxes in skeleton screens over boxes that show the predominant color of the image that will later occupy the space and CSS color gradients made from two dominant colors up to actual low quality raster images downscaled to a few pixels, saved in low quality and then blurred to provide a preview of image contents.
Many major players have adopted one of these image placeholder techniques: Guypo incepted LQIP in 2012 and Akamai adopted it as part of their image optimization tools, Google started using colored placeholders a long time ago, Facebook, Pinterest and Medium made a significant impact with their LQIP implementations and the most popular JS libraries for responsive images include LQIP implementations.
On the low end of the bytesize spectrum of image placeholder implementations, we have skeleton screens and colored boxes, weighing only a few extra bytes each, but providing no preview of image contents. On the high end of the bytesize spectrum, the LQIP technique ships an actual raster image, which gives a good initial impression of image contents to come, but weighs more heavily in bytesize.
If we disregard Facebooks's native-app implementation of shipping a custom image decoder that enables them to hardcode image headers, the current minimum bytesize for LQIP raster images is ~400-600 bytes. At this byterange, the preview image often looks distorted and coarse, especially on HiDPI screens. Many other LQIP implementations go for preview images of ~2kb in size, which provides a much better initial visual impression but comes at the cost of significantly increased bytesize for the LQIP implementation.
SQIP is an attempt to find a balance between these two extremes: it makes use of Primitive to generate a SVG consisting of several simple shapes that approximate the main features visible inside the image, optimizes the SVG using SVGO and adds a Gaussian Blur filter to it. This produces a SVG placeholder which weighs in at only ~800-1000 bytes, looks smooth on all screens and provides an visual cue of image contents to come.
# Generate a SVG placeholder and print an example <img> tag to stdoutsqip input.jpg# Save the placeholder SVG to a file instead of printing the <img> to stdoutsqip -o output.svg input.jpg# Customize the number of primitive SVG shapes (default=8) to influence bytesize or level of detailsqip -n 4 input.jpg# Specify the type of primitive shapes that will be used to generate the image (default=0)# 0=combo, 1=triangle, 2=rect, 3=ellipse, 4=circle, 5=rotatedrect, 6=beziers, 7=rotatedellipse, 8=polygonsqip -m 4 input.jpg# Set the gaussian blur (default=12)sqip -b 3 input.jpg
Node API takes filename and number of primitives in an object, returns an object with SVG, base64 encoded SVG and image dimensions.
- filename (required)
- numberOfPrimitives (default=8)
- mode (default=0)
- blur (default=12)
- final_svg - string
- svg_base64encoded - string
- img_dimensions - object
const sqip = ;const result =;
- trivago N.V. (https://github.com/trivago)
- Efe Gürkan Yalaman (https://github.com/efegurkan)
- Michael Fogleman (https://github.com/fogleman)
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