Magento – How to get image path in magento 2 module

You can check in details by click, Resize Custom Image in Magento 2

Inside Block file keep below code,

   protected $_filesystem ;
   protected $_imageFactory;
   public function __construct(            
        \Magento\Framework\Filesystem $filesystem,         
        \Magento\Framework\Image\AdapterFactory $imageFactory         
        ) {         
        $this->_filesystem = $filesystem;               
        $this->_imageFactory = $imageFactory;         
        }

    // pass imagename, width and height
    public function resize($image, $width = null, $height = null)
    {
        $absolutePath = $this->_filesystem->getDirectoryRead(\Magento\Framework\App\Filesystem\DirectoryList::MEDIA)->getAbsolutePath('custom_module/posts/').$image;
        if (!file_exists($absolutePath)) return false;
        $imageResized = $this->_filesystem->getDirectoryRead(\Magento\Framework\App\Filesystem\DirectoryList::MEDIA)->getAbsolutePath('resized/'.$width.'/').$image;
        if (!file_exists($imageResized)) { // Only resize image if not already exists.
            //create image factory...
            $imageResize = $this->_imageFactory->create();         
            $imageResize->open($absolutePath);
            $imageResize->constrainOnly(TRUE);         
            $imageResize->keepTransparency(TRUE);         
            $imageResize->keepFrame(FALSE);         
            $imageResize->keepAspectRatio(TRUE);         
            $imageResize->resize($width,$height);  
            //destination folder                
            $destination = $imageResized ;    
            //save image      
            $imageResize->save($destination);         
        } 
        $resizedURL = $this->_storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_MEDIA).'resized/'.$width.'/'.$image;
        return $resizedURL;
  } 

Now Call inside phtml file,

$block->resize('test.jpg',500,400);

Use code below to get module directory path

class CustomModel
{
    /**
     * @var \Magento\Framework\Module\Dir\Reader
     */
    protected $moduleReader;

    /**
     * @param \Magento\Framework\Module\Dir\Reader $moduleReader
     */
    public function __construct(
        \Magento\Framework\Module\Dir\Reader $moduleReader
    ) {
        $this->moduleReader = $moduleReader;
    }

    public function getDirectory()
    {
        $viewDir = $this->moduleReader->getModuleDir(
            \Magento\Framework\Module\Dir::MODULE_VIEW_DIR,
            'Vendor_Module'
        );
        return $viewDir . '/frontend/web/images';
    }
}

but if you need to check content static file I'd recommend you to use this way...

class CustomModel
{
/**
     * @var \Magento\Framework\View\Asset\Repository
     */
    protected $assetRepository;

    /**
     * @param \Magento\Framework\View\Asset\Repository $assetRepository
     */
    public function __construct(
        \Magento\Framework\View\Asset\Repository $assetRepository
    ) {
        $this->assetRepository = $assetRepository;
    }

    public function getMyFilePath()
    {
        $fileId = 'Vendor_Module::images/myimage.png';
        $params = [
            'area' => 'frontend'
        ];
        $asset = $this->assetRepository->createAsset($fileId, $params);
        try {
            return $asset->getSourceFile();
        } catch (\Exception $e) {
            return null;
        }
    }
}