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29.[The loading bar keeps spinning when capture the image with iPhone.](/_articles/faq/the-loading-bar-keeps-spinning-when-capture-the-image-with-iphone.md)
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30.[How to debug on Dynamic Web TWAIN online demo?](/_articles/faq/debug-on-online-demo.md)
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31.[Dynamic Web TWAIN prompts the .deb installer for Windows](/_articles/faq/incorrect-installer-for-windowsARM64.md)
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32.[Why am I unable to load the TIFF file into Dynamic Web TWAIN?](/_articles/faq/unable-to-load-4-bit-tiff.md)
title: Why am I unable to load the TIFF file into Dynamic Web TWAIN?
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keywords: Dynamic Web TWAIN, Error Troubleshooting, tiff
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breadcrumbText: Why am I unable to load the TIFF file into Dynamic Web TWAIN?
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description: Why am I unable to load the TIFF file into Dynamic Web TWAIN?
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---
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# Error Troubleshooting
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## Why am I unable to load the TIFF file into Dynamic Web TWAIN?
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### Symptom
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When you attempt to import a TIFF file using Dynamic Web TWAIN, it will indicate that the file has been successfully loaded, but the image does not appear in the viewer.
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### Cause
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All versions prior to version 19.0 do not support importing 4-bit color images. If you encounter the issue mentioned above, your file may be using the deprecated JPEG compression standard.
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### Resolution
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Support for 4-bit TIFF format was added in version 19.1. Therefore, please update to version 19.1 to resolve this issue.
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> If the resolution doesn't work for you, please [contact us](https://www.dynamsoft.com/company/contact/).
Copy file name to clipboardExpand all lines: _articles/faq/use-usb-webcam-to-capture.md
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@@ -12,4 +12,4 @@ description: Can I use built-in or USB webcam to capture document?
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## Can I use built-in or USB webcam to capture document?
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Yes, you can use the built-in or USB webcam to capture documents. DirectShow Cameras and MediaDevices Cameras can easily capture documents. You can test your camera's compatibility <ahref="/web-twain/docs/general-usage/scanner-image-acquisition.html#capture-from-cameras"target="_blank">link</a> will help you to embed code for capturing documents from webcams.
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Yes, you can use either the built-in webcam or a USB-connected webcam to capture documents. To verify if your device supports the DirectShow architecture, you can test it using the [online demo](https://demo.dynamsoft.com/web-twain/camera-scan).
Copy file name to clipboardExpand all lines: _articles/faq/what-does-dynamsoft-service-do-on-end-user-machine.md
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@@ -35,13 +35,13 @@ By default, there are three Dynamic Web TWAIN Service processes running which us
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- Then there is a **monitor process** which is meant to monitor the main process and automatically start it in case it crashes. The monitor process starts like this:
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```cmd
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C:\Program Files (x86)\Dynamsoft\Dynamic Web TWAIN Service {version number}\DynamicWebTWAINService.exe -asmonitor Global\Dynamsoft_1.5.0_352325843_stop_service_event Global\Dynamsoft_1.5.0_352325828_certcheck_event
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C:\Program Files (x86)\Dynamsoft\Dynamic Web TWAIN Service {version number}\DynamicWebTWAINService.exe -asmonitor XXX
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```
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- The last always-running process is meant to **support the SSL certificate specifically for the Firefox browser**:
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```cmd
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"-scan" "\\.\pipe\dynamsoftscan_15.0_70056_60" "0" "Global\ss352604281_61_70056" "0" "C:\Program Files (x86)\Dynamsoft\Dynamic Web TWAIN Service 19\dwt_19.0.0.0318.dll"
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C:\Program Files (x86)\Dynamsoft\Dynamic Web TWAIN Service {version number}\DynamicWebTWAINService.exe -certCheck XXX
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```
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> Note: you may find another process named 'Dynamsoft Scanning New Module', which is a scan module. This process will start when you access an application integrated with Dynamic Web TWAIN, and will automatically stop when you close the application.
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### Components
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These files are named with their version number. The following uses v16.1.1 as an example.
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These files are named with their version number. The following uses v19.0 as an example.
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* Core scanning module
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+`dwt_16.1.0.0728.dll`
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+`dwt_19.0.0.0318.dll`
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+`DSSCN2.exe`
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+`DSSCN2x64.exe`
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+`TWAINDSM.dll`
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+`TWAINDSMx64.dll`
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* Barcode Reader Addon
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+`\x64\`
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+`\x86\`
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+`dbr_7.4.0.0428.dll`
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+`dbrx64_7.4.0.0428.dll`
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* PDF Addon
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+`DynamicPdfCore_11.0.0.0428.dll`
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+`DynamicPdfCorex64_11.0.0.0428.dll`
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+`DynamicPdfR_11.0.0.0428.dll` (for the PDF Rasterizer)
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+`DynamicPdfRx64_11.0.0.0428.dll` (for the PDF Rasterizer)
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+`\x64\DynamsoftBarcodeReaderx64_9.6.dll`
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+`dbrx64_9.6.2.0318.dll`
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* PDF Addon & Imaging features
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+`\x64\DynamsoftCorex64.dll`
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+`\x64\DynamsoftImageProcessingx64.dll`
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+`\x64\ImageProcessx64.dll`
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* Webcam Addon
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+`DynamicWebcam_15.0.0.0625.dll`
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+`DynamicWebcamx64_15.0.0.0625.dll`
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* File Uploader
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+`UploadModule_1.6.0.0428.dll`
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* Imaging features
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+`DynamicImage.dll`
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+`DynamicImagex64.dll`
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+`UploadModule_1.9.0.0318.dll`
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### Supporting files
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*`favicon.ico` : The favicon.
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*`legal.txt` : Legal notice.
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*`libcurl.dll` : The file transfer library.
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* For OpenSSL
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+`libeay32.dll`
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+`ssleay32.dll`
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+`libssl-3-x64.dll`
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*`port.lock`
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>
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> These requests are handled by the JavaScript client of the library. Please do not try to make similar requests in your own code without consulting [Dynamsoft Support](/_articles/about/getsupport.md).
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- Then there is a **monitor process** which is meant to monitor the main process and automatically start it in case it crashes. The monitor process starts like this:
> Note: you may find another process named 'Dynamsoft Scanning New Module', which is a scan module. This process will start when you access an application integrated with Dynamic Web TWAIN, and will automatically stop when you close the application.
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