For this month’s column, we turn our attention back to software. Useful image editors, converters, and renamers have already been covered (GIMP, XnConvert, and Advanced Renamer). Now, let’s look at validation software.
This type of software supports the validation of digital files by scanning specific file formats for errors, data loss, corruption, etc. I recently spent time researching and testing various validation programs. There are many available, and most of them focus on certain formats (TIFF, PDF, JPEG, etc.).
One program specifically designed for JPEG, PNG, and GIF caught my eye. It’s called Bad Peggy. I wish I knew more about the origin of the name. I also wish I knew more about the program’s logo/ icon (a corrupt image of a foot in high heels that is turned sideways). The name and logo are certainly intriguing.
According to the Community Owned digital Preservation Tool Registry (COPTR), which is a fantastic resource, Bad Peggy “scans images (JPEG, PNG, BMP, GIF) for damages and other blemishes, and shows the results and files instantly. It enables you to find such broken files quickly, inspect and then either delete or move them to a different location.”
JPEG (or JPG) is an abbreviation for Joint Photographic Experts Group. It is a very common image format. JPEGs typically have manageable file sizes which makes them easy to share, email, upload, etc. The reason for the small file size, however, is the lossy compression process associated with the format (see the “JPG vs. PNG” article for more information). In the digital preservation world, JPEG is not a preferred format for originals because of its data loss (see NDSL’s “Digitization Standards”), but JPEG is still widely used. This is why Bad Peggy can be useful for both institutions and citizens since both will likely use JPEG extensively.
One of the best things about Bad Peggy is its simplicity. You add images and then scan. That’s about it. There are no confusing settings or add-ons. It is short and sweet. Bad Peggy quickly scans images (or entire folders of images) and checks for irregularities, such as corruption.
Although Bag Peggy has been tested and authenticated by others, I wanted to do a test for myself. Believe it or not, there are websites that will corrupt files for you. Although I do not support the reasons the website mentions for corrupting files, it was a rather useful site for my test. Of course, NEVER run tests like this on the original file. ALWAYS make a copy to play around with.
Back to the experiment. I corrupted a copy of a JPEG with the website and then used Bad Peggy. The program detected the issue right away. Nicely done, Bad Peggy! If you use JPEGs (or PNGs) and you want to keep an eye on them for long-term storage, Bad Peggy is a great option. Did I mention it’s free? I probably should have led with that.
For information on additional software that Digital Initiatives recommends, consult the Hardware & Software page on LibGuides.