Why does FastStone Image Viewer/editor blow out whites?

Started 3 weeks ago | Questions thread
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Kawika Nui
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Why does FastStone Image Viewer/editor blow out whites?
3 weeks ago

I have made an interesting and frustrating discovery.

If I shoot a high-contrast (surf with white foam against deep blue sea) picture in RAW (currently RW2 from GH3) and edit it in FS Image Viewer, here's what happens:

1. The JPEG preview does not have blown whites.

2. The full RW2 file has blown whites--huge pure white (255) areas in the foam.

3. If I use DNG Converter to convert RW2 to DNG,

a. the JPEG preview in FS does not have blown whites.

b. The full DNG file in FS has blown whites--huge pure white (255) areas in the foam.

c. The full DNG file does not have blown whites if I open it with CS4 or PSE (6).

I might add that the images were not overexposed; exposure was set for the highlights, and in many images the non-foam areas were underexposed (easily remedied in post).

So the question is: what is going on with FS, that JPEGs are OK but RAW files (of at least two types, RW2 and DNG) have badly blown whites?

I would much prefer to be able to do viewing and simple editing in FS Image Viewer, but this makes it impossible for many images because the results are unacceptable.

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