Blurhash string must be at least 6 characters

[jwb009]

I'm submitting a...

• bug report
• feature request
• general question

Steps to reproduce

1. Using this code, per the docs, results in the error in the title

{% set transform = craft.imagerx.transformImage(asset, { width: 160, height: 90 }) %}
<img src="{{ craft.imagerx.placeholder({ type: 'blurhash', hash: transform.getBlurhash(), width: 25, height: 10 }) }}" width="160" height="90">```


### Description
<!-- Describe both the expected and actual/current behaviour--> 
If I replace the `transform.getBlurhash()` with a random blurhash value, the image loads as "expected". This is obviously not the intended outcome, but I'm not sure where else to troubleshoot.

### Displayed errors, stack trace, relevant logs  
<!-- If it’s long, please paste to https://ghostbin.com/ and insert the link here -->

InvalidArgumentException: Blurhash string must be at least 6 characters in /var/www/html/vendor/kornrunner/blurhash/src/Blurhash.php:88
Stack trace:
#0 /var/www/html/vendor/spacecatninja/imager-x/src/services/PlaceholderService.php(174): kornrunner\Blurhash\Blurhash::decode('', 25, 10)
#1 [internal function]: spacecatninja\imagerx\services\PlaceholderService::spacecatninja\imagerx\services{closure}(Object(craft\cache\FileCache))
#2 /var/www/html/vendor/yiisoft/yii2/caching/Cache.php(607): call_user_func(Object(Closure), Object(craft\cache\FileCache))
#3 /var/www/html/vendor/spacecatninja/imager-x/src/services/PlaceholderService.php(193): yii\caching\Cache->getOrSet('imager-x-blurha...', Object(Closure))
#4 /var/www/html/vendor/spacecatninja/imager-x/src/services/PlaceholderService.php(61): spacecatninja\imagerx\services\PlaceholderService->placeholderBlurhash(Array)
#5 /var/www/html/vendor/spacecatninja/imager-x/src/variables/ImagerVariable.php(62): spacecatninja\imagerx\services\PlaceholderService->placeholder(Array)
#6 /var/www/html/vendor/twig/twig/src/Extension/CoreExtension.php(1607): spacecatninja\imagerx\variables\ImagerVariable->placeholder(Array)
#7 /var/www/html/vendor/craftcms/cms/src/helpers/Template.php(146): twig_get_attribute(Object(craft\web\twig\Environment), Object(Twig\Source), Object(spacecatninja\imagerx\variables\ImagerVariable), 'placeholder', Array, 'method', false, false)
#8 /var/www/html/storage/runtime/compiled_templates/9e/9ee707d0b77dbbea829b415500d369fdeb6e5abe1e030301f1dbacec78c6a91f.php(69): craft\helpers\Template::attribute(Object(craft\web\twig\Environment), Object(Twig\Source), Object(spacecatninja\imagerx\variables\ImagerVariable), 'placeholder', Array, 'method')
#9 /var/www/html/vendor/twig/twig/src/Template.php(394): __TwigTemplate_90144b85c1ee61594ca5a2d3927755d8371983e40b084f8223b5aaf523c1a98a->doDisplay(Array, Array)
#10 /var/www/html/vendor/twig/twig/src/Template.php(367): Twig\Template->displayWithErrorHandling(Array, Array)
#11 /var/www/html/vendor/twig/twig/src/Template.php(379): Twig\Template->display(Array)
#12 /var/www/html/vendor/twig/twig/src/TemplateWrapper.php(40): Twig\Template->render(Array, Array)
#13 /var/www/html/vendor/twig/twig/src/Environment.php(277): Twig\TemplateWrapper->render(Array)
#14 /var/www/html/vendor/craftcms/cms/src/web/View.php(456): Twig\Environment->render('sections', Array)
#15 /var/www/html/vendor/craftcms/cms/src/web/View.php(509): craft\web\View->renderTemplate('sections', Array)
#16 /var/www/html/vendor/craftcms/cms/src/web/TemplateResponseFormatter.php(56): craft\web\View->renderPageTemplate('sections', Array, 'site')
#17 /var/www/html/vendor/yiisoft/yii2/web/Response.php(1098): craft\web\TemplateResponseFormatter->format(Object(craft\web\Response))
#18 /var/www/html/vendor/craftcms/cms/src/web/Response.php(286): yii\web\Response->prepare()
#19 /var/www/html/vendor/yiisoft/yii2/web/Response.php(339): craft\web\Response->prepare()
#20 /var/www/html/vendor/yiisoft/yii2/base/Application.php(390): yii\web\Response->send()
#21 /var/www/html/web/index.php(17): yii\base\Application->run()
#22 {main}

### Additional info

- Imager version & edition: Imager X Pro 4.1.12
- Imager transformer: AWS Serverless
- Craft version: 4.4.5
- PHP version: 8.0.26
- Image driver & version: imagick 3.7.0

[aelvan]

If you're using AWS Serverless for the image that you run getBlurhash() on, that would explain it, since that transformer doesn't support blurhash.

[jwb009]

I see....that would be why! Thanks for the quick response. Is it possible to add it to the AWS transformer? It seems supported on Sharp.js per this article https://css-tricks.com/inline-image-previews-with-sharp-blurhash-and-lambda-functions/ But I have no clue what's involved in implementing it, would just be nice to have.

[aelvan]

No, the kind of flexibility that the article talks about is not available in the AWS transformer (AFAIK).

But, unless you're using AWS Serverless because you can't use local transforms, there's always the option of using the craft transformer for this one transform, like this:

{% set transform = craft.imagerx.transformImage(asset, { width: 160, height: 90 }, {}, { transformer: 'craft' }) %}
<img src="{{ craft.imagerx.placeholder({ type: 'blurhash', hash: transform.getBlurhash(), width: 25, height: 10 }) }}" width="160" height="90">```

Hope that helps!

[jwb009]

That does help, thank you! I hadn't thought of the workaround to use local transforms, but that should work.