FastRawViewer Developers' Blog

Do Not Let White Balance Throw You Off-Balance

White balance: does it or does it not affect RAW image data at all? Certainly it affects JPEG, but how and why?

We are going to demonstrate that setting the white balance in a camera has no effect on "normal" RAW data.

To do so, we took four shots under the same, fairly constant, light, varying only the white balance (WB) settings in the camera (and the number of roasted coffee beans on the skillet handle). You will see the "as shot" color differs dramatically between the shots, yet the RAW histograms of these shots are, for all practical purposes, will stay the same.

You can repeat this simple experiment yourself, and also check that changing the white balance setting does not affect the in-camera exposure metering readings.

White balance as channel exposure correction

FastRawViewer 1.4.4 Release

FastRawViewer 1.4.4

Camera support

  • Canon EOS M100, G1 X Mark III
  • Fujifilm X-E3
  • Leica CL
  • Nikon D850
  • Olympus E-M10 mk III
  • Panasonic G9
  • PhaseOne IQ3 100Mp Trichromatic
  • Sony RX10-IV, RX0, A7R III

New features / settings

  • Combining the 'Single File' and 'Batch' keys
  • New XMP Labels options added
  • New Zoom options added
  • Batch IPTC/XMP Title/Description editing
  • Skipping several files using a single keystroke
  • Menu - File rearranged and Reference dialog reworked

How to Trash a Good Shot in One Step...

Not sure how? It really is very simple - just rely on the JPEG histogram. The one on the back of your camera will do, or one derived from a JPEG by some viewer, or (sometimes) even by a RAW converter.

Many strongly colored objects - yellow, red, blue, pink, orange, purple, etc. are suffering from culling based on JPEG histograms.

FastRawViewer is the only culling tool that displays the true RAW histogram, which allows you to determine if the shot was exposed correctly.

So, if you don't want to trade your (technically) best shots for worse ones, start using RAW histograms for culling!

Yellow daffodils. RAW and RAW histogram

FastRawViewer 1.4.3 Release

FastRawViewer 1.4.3


  • Adobe-formatted contrast setting is now always recorded to XMP files.
  • External JPEGs is now used as thumbnails if the corresponding setting is on.

Camera support

  • Fujifilm X-A10
  • Nikon D7500

New features / small changes

  • Several new actions and hotkeys have been added.
  • XMP data now is always taken from the file on the disk (not from the cache).

FastRawViewer 1.4.2 Release

FastRawViewer 1.4.2

New features

  • Custom zoom value (in the range form 10 to 1000%)
  • Keyboard combinations for easy access to Folders / Favorite Folders / Filmstrip / Grid panels

Camera support

  • Olympus TG-5
  • Panasonic TZ90 (preliminary support)


  • Some atavisms from version 1.3 were removed
  • Some interface reactions to changing sorting order were corrected.

FastRawViewer 1.4 Release

FastRawViewer 1.4. Main Screen
  • Main points to look for:
  • The sorting and filtration of files in folders has been massively overhauled
  • Touchscreen support
  • File tree editing
  • Drag-drop files into other applications
  • Drag-drop into the folder tree
  • XMP processing has been expanded and improved
  • EXIF is now displayed in Grid mode without any additional user actions
  • Over- and Underexposure display has been improved

FastRawViewer 1.3.9 released

FastRawViewer 1.3.9

New Settings

  • New option for Start without filename setting
  • Full support for all of the EXIF and new pseudo-tag File Modify date
  • Full support of all 'EXIF Orientation': image flip (mirror) added.
  • Image display speed optimization
  • The new hidden setting to change the algorithm for detecting overexposure
  • and more...

New Cameras' Support

Minor Changes and Bug Fixes

Color is a Slippery Trickster

Origina ARW from SONY a6500: embedded JPEG vs. render using correct camera profile

“How do you know, when you think blue — when you say blue — that you are talking about the same blue as anyone else?"

Christopher Moore, Sacre Bleu: A Comedy d'Art

The goals of this article are twofold: the first is to demonstrate that out-of-camera JPEGs, including in-camera previews, can’t be implicitly, with no checking, used to evaluate color (as we already know, the in-camera histogram is misleading, too). The second is to show that it isn’t necessary that the camera manufacturer-recommended converter be specifically tuned to match the out-of-camera JPEG.

FastRawViewer 1.3.8. released

FastRawViewer 1.3.8

New Settings

  • Natural sorting of files and folders
  • Start of Copy/Move folder selector
  • Check global folders presence on startup
  • Shift-Click selection mode

New Cameras' Support

Minor Changes and Bug Fixes

FastRawViewer 1.3.7 released

FastRawViewer 1-3-7

We are happy to announce the FastRawViewer 1.3.7

This version adds twelve new camera support and minor bug fixes

Camera support:

  • Canon EOS M5
  • Hasselblad X1D, True Zoom
  • Google Pixel, Pixel XL
  • Olympus E-M1 Mark II
  • Panasonic DMZ-FZ2500/2000/FZH1, DMC-LX9/10/15
  • Samsung Galaxy S7/S7 Edge
  • Sony ILCA-99M2 (A99-II), a6500


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