Crop variants for tt_content image - typo3

Question

I tried the first time the new image manipulation feature in TYPO3 and stumbled upon some problems. I am using TYPO3 8.7.16. The image processing is working correctly (tested in install tool using ImageMagick).
For testing purposes I overrided the TCA of tt_content:
$GLOBALS['TCA']['tt_content']['columns']['image']['config'] ['overrideChildTca']['columns']['crop'] = [
'config' => [
'cropVariants' => [
'desktop' => [
'title' => 'Desktop',
'selectedRatio' => '4:3',
'allowedAspectRatios' => [
'4:3' => [
'title' => '4:3',
'value' => 4 / 3,
],
],
],
'tablet' => [
'title' => 'Tablet',
'selectedRatio' => '16:9',
'allowedAspectRatios' => [
'16:9' => [
'title' => '16:9',
'value' => 16 / 9,
],
],
],
'mobile' => [
'title' => 'Mobile',
'selectedRatio' => '2:3',
'allowedAspectRatios' => [
'16:9' => [
'title' => '2:3',
'value' => 2 / 3,
],
],
],
],
],
];
When I use the editor for image manipulation I can crop the different formats and after accepting the manipulation I see the cropped images as preview in the content element:
After saving the content element I see the following (the cropped images are not shown anymore):
Is this a bug? But that doesn't bother me much for now.
Now I tried to show e.g. the cropped desktop image in frontend. I copied the Media/Rendering/Image.html partial and changed the content to:
<f:image image="{file}" cropVariant="desktop" width="480" alt="{file.alternative}" title="{file.title}" />
I thought that is enough to show the cropped image, but it was not. I see the original file. When I debugged the file reference I see, that the configuration for the cropped images are stored correctly in sys_file_reference:
Now I have no clue what to do to get the cropped images in frontend.
Any ideas?
Edit: Now I found the problem, I had some issues with ImageMagick, so that the cropped images cannot be created.

Answer 1

i would recommend you to look at the article from Clickstorm
Clickstorm CropVariant Images
You can easily access the cropVariants with srcset.
<f:if condition="{files}">
<f:image src="{image.id}" treadIdAsReference="1" srcset="{f:uri.image(image:image.id,width:'2500',height:'816',cropVariant:'desktop')}" alt="{files.0.alternative}" />
</f:if>
Maybe you use the Picture Element like this:
<picture>
<source media="(min-width: 1400px)" srcset="{f:uri.image(src:'{image.uid}',treatIdAsReference:'1',width:'1400',cropVariant:'default')}">
<source media="(max-width: 1399px) and (min-width:1025px)" srcset="{f:uri.image(src:'{image.uid}',treatIdAsReference:'1',cropVariant:'default-md')}">
<source media="(max-width: 1024px) and (orientation:portrait)" srcset="{f:uri.image(src:'{image.uid}',treatIdAsReference:'1',width:'768',cropVariant:'tablet-portrait')}">
<source media="(max-width: 1024px) and (orientation:landscape)" srcset="{f:uri.image(src:'{image.uid}',treatIdAsReference:'1',width:'768',cropVariant:'tablet-landscape')}">
<source media="(max-width: 667px) and (orientation:portrait)" srcset="{f:uri.image(src:'{image.uid}',treatIdAsReference:'1',width:'667',cropVariant:'smartphone-portrait')}">
<source media="(max-width: 667px) and (orientation:landscape)" srcset="{f:uri.image(src:'{image.uid}',treatIdAsReference:'1',width:'667',cropVariant:'smartphone-landscape')}">
<img src="{f:uri.image(crop: image.crop, src: image.id, cropVariant:'default')}"title="{image.title}" alt="{image.alternative}" />
</picture>
I hope that help you in getting started for the Frontend part.