The compression debate
For years Sony was criticised because many Alpha bodies recorded a lossy compressed raw by default, which could produce subtle artefacts around very high-contrast edges in extreme cases. Sony responded by adding uncompressed raw, and later lossless compressed options across newer bodies, giving photographers a genuine choice between file size and absolute fidelity. The lossless compressed mode in particular addressed the old complaint while keeping files manageable. If you shoot a current Alpha, it is worth checking which raw compression you have selected.
ARW across Sony generations
ARW has carried several internal revisions as Sony iterated rapidly through sensor and processor generations, so the format you get from an early A7 differs under the hood from an A7R V file. This fast cadence occasionally means brand-new Sony bodies arrive before every third-party converter has caught up. Sony’s own Imaging Edge software develops ARW and applies the camera’s creative looks. In practice most major editors add support quickly given Sony’s market share.
Morphr and ARW previews
Because raw sensor data cannot be displayed as-is, each ARW includes a full-size JPEG that the camera built at capture. Morphr extracts that embedded JPEG and saves it as a JPEG or PNG locally in your browser, with nothing leaving your machine. The output reflects the in-camera creative style and white balance rather than a fresh raw development, so think of it as the camera’s own picture rather than an edited one. To exploit the dynamic range Sony sensors are known for, you would still process the ARW in a dedicated editor.
Strengths
- Newer bodies offer uncompressed and lossless compressed raw for full fidelity.
- Captures the wide dynamic range Sony sensors are noted for.
- Rapid third-party support thanks to the Alpha system’s popularity.
- Embedded full-size preview that Morphr can extract without any upload.
Limitations
- Lossy compressed raw was the default on many older bodies.
- Multiple internal revisions can trip up out-of-date software.
- Brand-new Sony bodies sometimes precede full converter support.
- Raw data needs development before it looks like a finished image.
When to use Sony ARW
Use ARW with lossless or uncompressed settings when you want the most editing headroom from a Sony Alpha. Turn to Morphr when you just need a JPEG or PNG of the embedded preview for quick sharing.
Sony ARW FAQ
- Is ARW better than JPEG?
- For editing, yes — ARW keeps the full sensor data, so you have far more room to adjust exposure, white balance and shadows than a finished JPEG allows. JPEG is smaller and instantly shareable, which is exactly what Morphr produces from the ARW preview.
- Which ARW compression should I choose on my Sony?
- Lossless compressed is the usual recommendation: it keeps full quality while reducing file size. Choose uncompressed only if your workflow demands it, and avoid the older lossy mode if your body offers an alternative.
- Why will my older software not open my new Sony ARW?
- Sony revises the ARW internals with new sensors, so a fresh body can outpace older converters. Updating your raw editor, or using Sony’s Imaging Edge, usually resolves it.