https://github.com/zotonic/eblurhash
Blurhash in Erlang
https://github.com/zotonic/eblurhash
Last synced: 13 days ago
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Blurhash in Erlang
- Host: GitHub
- URL: https://github.com/zotonic/eblurhash
- Owner: zotonic
- License: apache-2.0
- Created: 2020-04-03T20:05:22.000Z (about 5 years ago)
- Default Branch: master
- Last Pushed: 2023-03-05T18:08:44.000Z (about 2 years ago)
- Last Synced: 2025-03-27T07:51:35.463Z (about 1 month ago)
- Language: C
- Homepage: https://hex.pm/packages/eblurhash
- Size: 200 KB
- Stars: 11
- Watchers: 5
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# eblurhash - Blurhash for Erlang
This is an Erlang version of https://blurha.sh
A _blurhash_ is a compact string with encoded colors to show a blurred version of an image before the image
itself is loaded.
## With ImageMagick
Use the `magick` function to first let imagemagick resize (and secure) the
image, before using the blurhash program to calculate the hash.
```erlang
eblurhash:magick("path/to/image.jpg").
```
Return something like:
```erlang
{ok, <<"MlMF%n00%#Mwo}S|WCWEM{a$R*bbWBbHfl">>}
```
**Note:** you will need to have ImageMagick installed
The `magick` command checks the image size and selects optimal X and Y size for the blurhash.
Where X and Y are in the range 1..5.
The command line program `convert` is used to convert the image to a smaller gif file.
This gif file is then provided to the `blurhash` program.
## Using `blurhash` directly
This uses the C version of blurhash on the supplied image file.
The C version uses `stb_image` to load images, which is not security-hardened, so it
is **not** recommended to use this version in production on untrusted data!
The blurhash command needs to have the X and Y arguments provided:
```erlang
eblurhash:hash(5, 3, "path/to/image.jpg").
```
Returns `{ok, <<"...">>}` or `{error, Reason}`.