Guide

How to convert RAW camera photos on Mac

RAW files from your camera contain the most image data possible, but they are not practical for sharing, uploading, or viewing in most applications. Converting to JPEG, TIFF, or PNG lets you use your photos everywhere while starting from the highest quality source.

What are RAW files and why do cameras use them?

RAW files contain minimally processed data directly from the camera's image sensor. Unlike JPEG, which applies compression, color adjustments, sharpening, and noise reduction in-camera, RAW preserves the full sensor data for processing later on a computer.

Each camera manufacturer has its own RAW format: Canon uses CR2/CR3, Nikon uses NEF, Sony uses ARW, Fujifilm uses RAF, and so on. Adobe's DNG (Digital Negative) format is an open RAW format designed to be a universal alternative. These files are large, typically 20-50 MB per image, compared to 3-8 MB for a high-quality JPEG.

The advantage of RAW is post-processing flexibility. You can adjust exposure by 2-3 stops, recover blown highlights, shift white balance, and apply noise reduction without the quality degradation you would see making the same adjustments to a JPEG. For serious photography, shooting RAW is essential.

When to convert RAW to other formats

You need to convert RAW files when sharing photos with clients, posting on social media, uploading to websites, printing through consumer print services, or opening images in applications that do not support RAW. Essentially, any use beyond your personal editing workflow requires conversion.

The target format depends on the use case. JPEG is the universal choice for sharing, email, and web. TIFF preserves full quality for professional print workflows and further editing. PNG is useful when you need lossless compression or transparency. WebP offers the best compression for web publishing.

Converting RAW files on Mac, then finishing them with File Studio

macOS reads most major RAW formats (CR2, CR3, NEF, ARW, RAF, DNG, ORF, RW2, and more) through its built-in camera RAW support. Import the files into Photos and use File > Export to save JPEG, TIFF, or PNG copies, or open them in Preview and use File > Export. In Terminal, sips -s format tiff photo.cr2 --out photo.tiff works for scripted batches. Your editor of choice, such as Lightroom or Capture One, offers the most control over RAW processing.

File Studio does not open RAW files, but it handles the steps that follow. Once your photos are JPEG or TIFF, Batch Processing can resize, compress, watermark, or convert entire folders to WebP or PNG at once, and a watch folder can do this automatically for every file you export.

Keep your RAW originals as your archive. If you compress the exported JPEGs in File Studio, EXIF and GPS data are removed from the compressed copies, which is useful when sharing photos publicly.

What RAW files actually contain and why they are large

A RAW file contains the unprocessed sensor data from a digital camera, along with metadata describing how to interpret that data. Unlike JPEG, which applies white balance, color correction, noise reduction, sharpening, and compression during capture, RAW stores the raw sensor readings and defers all processing decisions to post-production software.

Most camera sensors capture 12 or 14 bits per pixel per color channel, compared to JPEG's 8 bits. A 24-megapixel camera at 14 bits produces roughly 48 MB of raw sensor data per image (before any compression). RAW files from high-resolution cameras (45+ megapixels) can exceed 100 MB each. Proprietary RAW formats (Canon CR3, Nikon NEF, Sony ARW, Fuji RAF) add varying levels of lossless compression, bringing typical file sizes to 25-60 MB.

The advantage of this large size is editing flexibility. The extra bit depth preserves detail in highlights and shadows that JPEG clips. Underexposed areas can be brightened by 2-3 stops without the banding and noise that would appear in a JPEG. White balance can be changed after the fact with no quality penalty. These capabilities make RAW the standard for professional and serious amateur photography.

RAW format compatibility challenges on macOS

Apple provides RAW support through its ImageIO framework, with codec updates delivered via macOS updates and occasional standalone RAW compatibility updates. However, new camera models release RAW formats that macOS may not support until Apple ships an update, which can take weeks or months after a camera launch.

The Adobe DNG (Digital Negative) format was created to address this fragmentation. DNG is an open, documented RAW format that any software can support. Adobe provides a free DNG Converter that transforms proprietary RAW formats into DNG. If your camera's RAW files are not supported by macOS, converting to DNG first solves the compatibility issue.

File Studio does not open RAW files. Photos, Preview, and sips use Apple's default rendering pipeline when exporting RAW to JPEG, TIFF, or PNG. For custom rendering (specific color profiles, adjustments), use Lightroom or Capture One for the initial development, then use File Studio for batch resizing, compression, watermarking, or format conversion of the developed outputs.

Choosing output format and settings for RAW conversion

For archival conversion (preserving maximum quality), TIFF at 16-bit is the standard choice. TIFF is lossless, widely supported, and preserves the full tonal range from the RAW file. The files are large (50-100 MB each for high-resolution cameras), but storage is cheap and the quality preservation is worth it for important images.

For sharing and everyday use, JPEG at quality 90-95 is appropriate. This produces files of 3-8 MB that look excellent and are universally compatible. The quality loss compared to the RAW original is negligible for screen viewing and standard printing. For web use, JPEG quality 82-88 or WebP quality 80 produces even smaller files with no visible difference at typical display sizes.

For professional print workflows, consult your print lab's specifications. Many labs accept TIFF, JPEG at maximum quality, or PSD (Photoshop format). Some labs have specific color profile requirements (Adobe RGB or ProPhoto RGB) that should be set during the RAW-to-output conversion.

How to do it with File Studio