The ChocoFlop project has been discontinued years ago!

Note that the app still works on Leopard (it used to be buggy on Snow Leopard) and can be downloaded for free. All limitations have been removed (no serial needed). However there will be no further development down the road. My humble opinion is that PixelMator is the best out there in this category, so buy it and support the developers! I did.
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High Dynamic Range (HDR)

Image modes

128 bits operations gives you much greater accuracy and is much less destructive.
Just try this:

You'll see that with 128 bits floating-point precision you can get back pretty much your original image without loss. With good old 32 bits trying to get back to the original luminosity would get you an awfully posterized image. Note that not all formats will allow you to save in such a color depth. OpenEXR (used by the movie industry and supported by OSX) allows it and so does ChocoFlop's native format (which uses TIFFs). Even if you wish to save a GIF (256 colors) in the end, it's always better to work in this mode and convert to 256 colors only when saving. Speed however can be impacted severely depending on the performance of your graphics card.

For more, read "Why is HDR so cool?".

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