Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your SR2 images to PNG64 format. This tool works for both professionals and casual users. Convert your images to PNG64 in seconds.
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Sony RAW 2
The predecessor to the modern ARW format.
SR2 is an older raw image format used by early Sony digital cameras, particularly the Cyber-shot R1 and early DSLRs before the Alpha branding fully took over with the ARW format. It contains raw sensor data, allowing for the same kind of editing flexibility as modern raw files, but from older sensor technology.
SR2 is a TIFF-based format. It typically stores 12-bit data. The encryption used in SR2 files was a point of contention in the early days of open-source raw decoding.
Sony used SRF, then SR2, and finally settled on ARW. SR2 represents the middle child of this evolution.
PNG-64 (64-bit RGBA)
The ultimate format for transparency precision in VFX and compositing.
PNG-64 is the heavyweight champion of the PNG family. It combines the 16-bit per channel color depth of PNG-48 with a 16-bit alpha channel. This provides 65,536 levels of transparency, compared to just 256 levels in a standard PNG-32. This format is almost exclusively used in high-end visual effects (VFX), 3D rendering, and professional compositing. When you are rendering a CGI character to place into a movie scene, you need the edges to blend perfectly with the background, even after heavy color grading. PNG-64's 16-bit alpha channel ensures that semi-transparent pixels (like motion blur or hair) retain enough data to be manipulated without becoming jagged or discolored.
A PNG-64 file contains four channels: Red, Green, Blue, and Alpha. Each is 16 bits deep (16 x 4 = 64 bits). The 16-bit alpha channel is the defining feature. In an 8-bit alpha channel (PNG-32), a very faint shadow might only have 3 or 4 levels of transparency steps, leading to visible banding when contrast is increased. In a 16-bit alpha channel, that same faint shadow has hundreds of steps, ensuring it remains smooth under any processing.
Like PNG-48, PNG-64 has been part of the standard since the beginning but was largely ignored by the web community due to file size. It found its niche in the 3D and video production industries as a more accessible alternative to formats like EXR or TIFF for storing intermediate render passes.
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