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What is Grey Box Testing?

Grey Box testing is testing technique performed with limited information about the internal functionality of the system. Grey Box testers have access to the detailed design documents along with information about requirements.

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Grey Box tests are generated based on the state-based models, UML Diagrams or architecture diagrams of the target system.

Gray-box testing Techniques:

• Regression testing

• Pattern Testing

• Orthogonal array testing

• Matrix testing

Benefits:

• Grey-box testing provides combined benefits of both white-box and black-box testing

• It is based on functional specification, UML Diagrams, Database Diagrams or architectural view

• Grey-box tester handles can design complex test scenario more intelligently

• The added advantage of grey-box testing is that it maintains the boundary between independent testers and developers

Drawbacks:

• In grey-box testing, complete white box testing cannot be done due to inaccessible source code/binaries.

• It is difficult to associate defects when we perform Grey-box testing for a distributed system.

Best Suited Applications:

Grey-box testing is a perfect fit for Web-based applications.

Grey-box testing is also a best approach for functional or domain testing.

Dec 21, 2020 • Filed to: Photo/Video/Audio Solutions • Proven solutions

As a reader asked us how to fix the grey box in photos, it got us digging into this issue. Ideally, your photos can suffer from this quality issue and get distorted due to different reasons. The good news is that you can fix this problem and retain your original photos by using some reliable tools. In this post, we will tell you how to repair the JPEG file and heal greyed-out photos effortlessly.

Why do photos get distorted with grey boxes?

Before we discuss different ways to fix greyed-out photos, it is important to learn what could have caused it in the first place. Here are some of its major reasons.

• Missing Data Segments: When certain parts of the file or data are missing, then it is represented by grey patches on the photo.
• Overwritten of Data: If an existing file has been overwritten by a new file and the process is halted in between, then you can see grey patches as well.
• Corrupt Images: At times, malware or any other malicious activity could corrupt your photos. These corrupted images can develop grey areas.
• Other Reasons: Besides that, other reasons like abrupt system shutdown, transfer halted in between, corrupt storage, unsafe photo tools, etc. can also cause it.

How to Fix Grey Box in Photos or Greyed-out Photos?

There are different techniques to repair a JPEG file. You can choose to recover the deleted or inaccessible content using a data recovery tool or can take the assistance of a repairing application to heal the file as well. To make it easier for you to fix the grey box in photos, we have listed the 3 best solutions.

Method 1: Recover photos with professional photo recovery software – Recoverit

One of the best ways to fix the grey box in photos is by recovering your data. If you are facing the issue due to a loss of information, then this would be a perfect solution. Too many times, we overwrite our data and end up getting greyed-out photos. Recoverit Data Recovery can retrieve the lost, inaccessible, or deleted photos of all formats. It can also recover videos, music, documents, emails, and other data files as well.

Your Safe & Reliable Hard Drive Data Recovery Software

• Recover lost or deleted files, photos, audio, music, emails from any storage device effectively, safely and completely.
• Supports data recovery from recycle bin, hard drive, memory card, flash drive, digital camera, and camcorders.
• Supports to recover data for sudden deletion, formatting, hard drive corruption, virus attack, system crash under different situations.

The tool features a user-friendly interface and is available for both Mac and Windows versions. To repair the JPEG file using Wondershare Recoverit, you can simply follow these steps:

1. Download Recoverit Data Recovery on your Mac or Windows. Launch it whenever you wish to recover any lost or inaccessible content.
2. From its welcome screen, simply select the location of your choice to scan. You can choose any internal drive or even a connected external source. After making appropriate selections, click on the 'Start' button.

1. Wait for a while as Recoverit will scan the respective location for accessible files. Try not to halt the process in between. Once the scan is completed, the interface will display the retrieved data in different folders. You can go to Photos > JPEG and preview the recovered files.

1. Finally, the retrieved files will be displayed on the interface. Just preview any file from here. To retrieve your data, simply select the photos of your choice and click on the 'Recover' button.

In the way, you can also recover photos or other formats, videos, emails, documents, and more. Here are the steps to MTS video recovery.

Method 2: Use professional photo repair tool – Stellar Phoenix Photo Repair

Apart from a recovery tool, users can also take the assistance of a photo repair application as well. Instead of retrieving another file, it will try to fix an existing JPEG. Therefore, you can go for this option if you only have a single copy of your photos. One of the best photo repairing tools for Mac and Windows isStellar Phoenix Photo Repair. It features a sophisticated algorithm that can repair unlimited photos at one time. Users can preview the repaired photos before saving them as well.

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The tool supports all the leading photo formats besides JPEG. If you want to fix the grey box in photos using Stellar Phoenix JPEG Repair, then simply follow these steps:

1. Install and launch Stellar Phoenix JPEG repair on your Mac or Windows whenever you wish to repair JPEG files.
2. Click on the 'Add File' button to load the distorted or damaged photos that you wish to fix. A browser window will open so that you can locate and load the photos of your choice.

1. You can load as many photos as you want here. The interface also provides an option to add or remove photos here. Once you have loaded all the files of your choice, click on the 'Repair' button.

1. This will start the JPEG repairing process and the greyed-out photos that you have loaded would be healed. Wait for a while for the process to be completed and don't halt it in between.

1. In the end, all the repaired photos would be displayed. You can preview these photos here as well. Simply select the photos of your choice and click on the 'Save' button.

The application will give you an option to save the photos in any location so that they won't be damaged again.

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Method 3: Repair corrupt JPEG with Hex Editor Tools

If you have the prior knowledge of hexadecimal codes, then you can simply use any Hex Editor tool to fix the grey box in photos. As you know, photos are stored in the form of hexadecimal codes which can be anywhere from 0000 to FFFF. You can alter the code to repair the JPEG file. The following steps can be implemented to do so.

1. Firstly, download and install a reliable hexadecimal editor on your system. HxD and Hex Workshop are the two recommended tools. You can visit their website to download them on your system.

2. Launch the editor and open the JPEG photo that you wish to repair.

3. Now, carefully examine the hexadecimal code of the JPEG file. From the header, you can change the code of the file. It can be anything from 0000 to FFFF.

4. Once you have made the relevant changes, save the file on your system. We would recommend making a second copy of it instead of overwriting the file.

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In this way, you would be able to repair greyed-out photos. Needless to say, it is a technical approach and a prior knowledge of hexadecimal codes would be needed.

That's it! By following these solutions, you would be able to fix the grey box in photos for sure. If you want to repair the JPEG file, then you can simply try Stellar Phoenix. To recover the lost or deleted files, simply give Recoverit a try. If you have any other solution to repair greyed-out photos, feel free to let us know in the comments below.

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