As shown below, Sigma Photo Pro will not display images properly (does not use color management to screen), making it difficult to gauge color or brightness. Even for black and white work this is a big problem.
Workaround: set SPP preferences to Working Color Space for X3F Files= Same Color Space as EXIF. By so doing, color display is usable (still not accurate however). Then save images in ProPhotoRGB.
This issues remains as of version 5.5 .
The overlaid window shown below is the image in Photoshop that was saved by SPP.
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Since 2009, Diglloyd Guide to Mirrorless covers mirrorless cameras and lenses. Includes interchangeable lens camera systems (Sony, Fujifilm, Olympus, etc) as well as fixed-lens cameras (Sony, Sigma, Ricoh, etc).
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It includes hundreds of pages of exclusive coverage and high resolution, Retina-grade examples for the new mirrorless camera systems from Sony, Fujifilm, Olympus, Sigma, Ricoh and more. Also included are operational concerns, like shutter vibration or other camera behaviors. This publication will play a decisive role in your selection and use of mirrorless cameras and lenses.
Sigma Photo Pro does not display color properly