With the release of the D4s and D810 cameras, Nikon has introduced a new format to store images – sRAW, or “RAW Size Small”, as referred to by Nikon. Although Canon has had this format available in its DSLRs for years, this is Nikon’s first time introducing it. As a result, a lot of Nikon users are wondering what this format is, how it works and how it compares to standard RAW files. Personally, I had very limited knowledge of this format and thought it would be an exciting feature, until I dug deeper and found out what it was all about. After a few hours of research (and some input from Iliah Borg, I decided to summarize my findings in this article, which I hope our readers will find useful. Let’s start with the basics first.
1) What is sRAW?
sRAW, which stands for “Small RAW” or “Small Resolution RAW” is a file format that was introduced by Kodak to allow photographers to capture images at smaller size in order to allow more images to be stored on memory cards and allow for faster workflow when full resolution files are not needed (since computers were slow for processing RAW data). The sRAW format was created as a bridge between full resolution RAW files and JPEG images. Since JPEG images are already processed, compressed and only contain 8-bit data, sRAW allowed more flexibility with more bit depth (Kodak’s original design of the sRAW format was 10-bit). The advantage was noticeably smaller file size, but at the expense of resolution – the resulting images contained either twice, or four times less megapixels. Still, these images contained more data than JPEG files for later post-processing, which increased the popularity of the format.