Created a custom image in category_form.xml i need to validate the image height and width while upload if its exceeds the allowed dimensions should display the alert message
<field name="thumbnail_logo" sortOrder="104" formElement="imageUploader">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="source" xsi:type="string">category</item>
</item>
</argument>
<settings>
<elementTmpl>ui/form/element/uploader/image</elementTmpl>
<dataType>string</dataType>
<label translate="true">Category Image</label>
<visible>true</visible>
<required>false</required>
</settings>
<formElements>
<imageUploader>
<settings>
<required>false</required>
<uploaderConfig>
<param xsi:type="url" name="url" path="catalog/category_image/upload"/>
</uploaderConfig>
<previewTmpl>Magento_Catalog/image-preview</previewTmpl>
<openDialogTitle>Media Gallery</openDialogTitle>
<initialMediaGalleryOpenSubpath>catalog/category</initialMediaGalleryOpenSubpath>
<allowedExtensions>jpg jpeg gif png</allowedExtensions>
<maxFileSize>4194304</maxFileSize>
</settings>
</imageUploader>
</formElements>
</field>