image formats
RAW
RAW image format stores unprocessed camera sensor data with maximum editing flexibility and image quality.
What is RAW?
RAW image format is an unprocessed, uncompressed file that contains the complete data captured by a camera's image sensor, serving as the digital equivalent of a film negative. Unlike JPEG files which are processed and compressed in-camera with permanent data loss, RAW files preserve the full sensor information including maximum dynamic range and color depth. RAW files are typically 2–6 times larger than equivalent JPEG files and require specialized software like Adobe Lightroom or Capture One to view and edit.
Importance of RAW
RAW format provides significantly greater editing headroom for photographers who need to adjust exposure, white balance, or colors without degrading image quality. When you need to resize or compress images for web use, starting with a RAW file or converted TIFF ensures the highest possible quality in your final output. RAW file editing headroom becomes critical when correcting underexposed photos or recovering highlight detail that would be permanently lost in JPEG format.
RAW in Practice
A photographer captures a sunset scene where the Canon 5D Mark IV creates both a 30MB RAW (.CR3) file and a 6MB JPEG simultaneously. The JPEG shows blown highlights in the sky due to in-camera processing limitations, while the RAW file retains recoverable highlight data across the full 14-bit color depth. Using Lightroom, the photographer can pull back 2-3 stops of highlight detail from the RAW file that simply doesn't exist in the JPEG version. After editing, the RAW-processed image can be exported as a web-optimized JPEG while maintaining superior tonal gradations.
RAW Best Practices
- → Convert RAW files to TIFF or high-quality JPEG before using web optimization tools for maximum quality retention.
- → Export RAW files at full resolution first, then resize for specific platforms to maintain optimal image quality.
- → Process RAW files in dedicated software like Lightroom or Capture One rather than attempting direct web conversion.
Example of RAW
Related Terms
Frequently Asked Questions
What is RAW image format?
RAW image format is an unprocessed file that contains all the original data captured by a camera's image sensor, without any in-camera adjustments like white balance, sharpening, or compression. RAW files preserve maximum image quality and editing flexibility, typically storing 12-14 bits of color information per channel compared to JPEG's 8 bits. However, RAW files are 2-6 times larger than JPEG files and require specialized software to open and edit.
RAW vs JPEG image quality difference?
RAW files contain significantly more image data and editing headroom than JPEG files, allowing photographers to recover highlight and shadow detail that would be permanently lost in JPEG format. JPEG files are processed and compressed in-camera, discarding approximately 90% of the original sensor data, while RAW files preserve the complete sensor capture. This means RAW files can withstand major exposure and color corrections without visible quality degradation, whereas similar edits to JPEG files often result in banding, posterization, and increased noise.
Why do photographers shoot in RAW format instead of JPEG?
Photographers choose RAW format because it preserves maximum image quality and provides extensive editing flexibility for post-processing workflows. RAW files contain the full dynamic range and color depth captured by the camera sensor, allowing photographers to correct exposure errors, adjust white balance, and recover highlight or shadow detail that would be impossible with JPEG files. Professional photographers especially value RAW format for challenging lighting conditions where in-camera JPEG processing might clip highlights or crush shadows permanently.